[syzbot] [block?] kernel BUG in bio_chain

[syzbot] [block?] kernel BUG in bio_chain

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    b2c27842ba85 Add linux-next specific files for 20251203
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1688d2b4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=caadf525b0ab8d17
dashboard link: https://syzkaller.appspot.com/bug?extid=f6539d4ce3f775aee0cc
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13dd5512580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=158d7512580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1168b2ea1fd1/disk-b2c27842.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2c3066faf780/vmlinux-b2c27842.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f6693abe374d/bzImage-b2c27842.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/caedad91e176/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=118d7512580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f6539d4ce3f775aee0cc@syzkaller.appspotmail.com

gfs2: fsid=syz:syz.0: jid=0, already locked for use
gfs2: fsid=syz:syz.0: jid=0: Looking at journal...
------------[ cut here ]------------
kernel BUG at block/bio.c:342!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 912 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: gfs2_recovery gfs2_recover_func
RIP: 0010:bio_chain+0xee/0x100 block/bio.c:342
Code: 43 1c 5b 41 5c 41 5d 41 5e 41 5f 5d e9 1b e1 f2 06 cc 89 f9 80 e1 07 fe c1 38 c1 7c cf e8 aa fc bd fd eb c8 e8 d3 a8 57 fd 90 <0f> 0b e8 cb a8 57 fd 90 0f 0b 0f 1f 84 00 00 00 00 00 90 90 90 90
RSP: 0018:ffffc90003d07540 EFLAGS: 00010293
RAX: ffffffff846a0a5d RBX: ffff8880207223c0 RCX: ffff888025b49e80
RDX: 0000000000000000 RSI: ffff8880207223c0 RDI: ffff888020722500
RBP: 0000000000002004 R08: ffffffff8476a450 R09: ffffffff8df419e0
R10: dffffc0000000000 R11: ffffed10040e4487 R12: dffffc0000000000
R13: 1ffff110040e44a8 R14: ffff888020722500 R15: ffff888020722540
FS:  0000000000000000(0000) GS:ffff888125f49000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff5e0f43000 CR3: 0000000073e76000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 gfs2_chain_bio fs/gfs2/lops.c:487 [inline]
 gfs2_find_jhead+0x627/0xe40 fs/gfs2/lops.c:549
 gfs2_recover_func+0x5f5/0x1c90 fs/gfs2/recovery.c:459
 process_one_work+0x93a/0x15a0 kernel/workqueue.c:3261
 process_scheduled_works kernel/workqueue.c:3344 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bio_chain+0xee/0x100 block/bio.c:342
Code: 43 1c 5b 41 5c 41 5d 41 5e 41 5f 5d e9 1b e1 f2 06 cc 89 f9 80 e1 07 fe c1 38 c1 7c cf e8 aa fc bd fd eb c8 e8 d3 a8 57 fd 90 <0f> 0b e8 cb a8 57 fd 90 0f 0b 0f 1f 84 00 00 00 00 00 90 90 90 90
RSP: 0018:ffffc90003d07540 EFLAGS: 00010293
RAX: ffffffff846a0a5d RBX: ffff8880207223c0 RCX: ffff888025b49e80
RDX: 0000000000000000 RSI: ffff8880207223c0 RDI: ffff888020722500
RBP: 0000000000002004 R08: ffffffff8476a450 R09: ffffffff8df419e0
R10: dffffc0000000000 R11: ffffed10040e4487 R12: dffffc0000000000
R13: 1ffff110040e44a8 R14: ffff888020722500 R15: ffff888020722540
FS:  0000000000000000(0000) GS:ffff888125f49000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563e2b893950 CR3: 0000000026910000 CR4: 00000000003526f0


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [block?] kernel BUG in bio_chain

[Edward Adam Davis]

#syz test

diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 97ebe457c00a..2de334034c74 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -484,6 +484,10 @@ static struct bio *gfs2_chain_bio(struct bio *prev, unsigned int nr_iovecs)
 	new = bio_alloc(prev->bi_bdev, nr_iovecs, prev->bi_opf, GFP_NOIO);
 	bio_clone_blkg_association(new, prev);
 	new->bi_iter.bi_sector = bio_end_sector(prev);
+	new->bi_end_io = prev->bi_end_io;
+	new->bi_private = prev->bi_private;
+	prev->bi_end_io = NULL;
+	prev->bi_private = NULL;
 	bio_chain(prev, new);
 	submit_bio(prev);
 	return new;

Re: [syzbot] [block?] kernel BUG in bio_chain

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

SYZFAIL: failed to recv rpc

SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)


Warning: Permanently added '10.128.1.220' (ED25519) to the list of known hosts.
2025/12/08 06:08:45 parsed 1 programs
[   80.568471][ T5835] cgroup: Unknown subsys name 'net'
[   80.737895][ T5835] cgroup: Unknown subsys name 'cpuset'
[   80.747550][ T5835] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   82.378701][ T5835] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[   85.176358][ T5846] chnl_net:caif_netlink_parms(): no params data found
[   85.252037][ T5846] bridge0: port 1(bridge_slave_0) entered blocking state
[   85.259854][ T5846] bridge0: port 1(bridge_slave_0) entered disabled state
[   85.267947][ T5846] bridge_slave_0: entered allmulticast mode
[   85.275836][ T5846] bridge_slave_0: entered promiscuous mode
[   85.285305][ T5846] bridge0: port 2(bridge_slave_1) entered blocking state
[   85.292659][ T5846] bridge0: port 2(bridge_slave_1) entered disabled state
[   85.301042][ T5846] bridge_slave_1: entered allmulticast mode
[   85.308395][ T5846] bridge_slave_1: entered promiscuous mode
[   85.339609][ T5846] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   85.351781][ T5846] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   85.383521][ T5846] team0: Port device team_slave_0 added
[   85.391461][ T5846] team0: Port device team_slave_1 added
[   85.418135][ T5846] batman_adv: batadv0: Adding interface: batadv_slave_0
[   85.426158][ T5846] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[   85.452312][ T5846] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   85.465292][ T5846] batman_adv: batadv0: Adding interface: batadv_slave_1
[   85.472528][ T5846] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[   85.499953][ T5846] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   85.542273][ T5846] hsr_slave_0: entered promiscuous mode
[   85.549470][ T5846] hsr_slave_1: entered promiscuous mode
[   85.698098][ T5846] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   85.710372][ T5846] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   85.720791][ T5846] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   85.731671][ T5846] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   85.763570][ T5846] bridge0: port 2(bridge_slave_1) entered blocking state
[   85.771157][ T5846] bridge0: port 2(bridge_slave_1) entered forwarding state
[   85.779469][ T5846] bridge0: port 1(bridge_slave_0) entered blocking state
[   85.786758][ T5846] bridge0: port 1(bridge_slave_0) entered forwarding state
[   85.841622][ T5846] 8021q: adding VLAN 0 to HW filter on device bond0
[   85.861268][   T12] bridge0: port 1(bridge_slave_0) entered disabled state
[   85.871035][   T12] bridge0: port 2(bridge_slave_1) entered disabled state
[   85.888626][ T5846] 8021q: adding VLAN 0 to HW filter on device team0
[   85.902665][ T1167] bridge0: port 1(bridge_slave_0) entered blocking state
[   85.910991][ T1167] bridge0: port 1(bridge_slave_0) entered forwarding state
[   85.926919][   T12] bridge0: port 2(bridge_slave_1) entered blocking state
[   85.934428][   T12] bridge0: port 2(bridge_slave_1) entered forwarding state
[   86.106940][ T5846] 8021q: adding VLAN 0 to HW filter on device batadv0
[   86.148700][ T5846] veth0_vlan: entered promiscuous mode
[   86.161121][ T5846] veth1_vlan: entered promiscuous mode
[   86.190643][ T5846] veth0_macvtap: entered promiscuous mode
[   86.201565][ T5846] veth1_macvtap: entered promiscuous mode
[   86.221704][ T5846] batman_adv: batadv0: Interface activated: batadv_slave_0
[   86.238028][ T5846] batman_adv: batadv0: Interface activated: batadv_slave_1
[   86.255901][ T1167] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   86.267532][ T1167] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   86.282145][ T1167] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   86.291809][ T1167] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   86.358097][ T5846] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.
[   86.499947][ T1130] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   86.579593][ T1130] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   86.653786][ T1130] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   86.773456][ T1130] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   86.920449][  T980] cfg80211: failed to load regulatory.db
[   88.255927][   T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   88.269511][   T52] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   88.278235][   T52] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   88.286903][   T52] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   88.295498][   T52] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   88.606147][   T12] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   88.618956][   T12] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   88.649294][ T3455] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   88.658849][ T3455] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   89.147456][ T1130] bridge_slave_1: left allmulticast mode
[   89.153339][ T1130] bridge_slave_1: left promiscuous mode
[   89.162769][ T1130] bridge0: port 2(bridge_slave_1) entered disabled state
[   89.198441][ T1130] bridge_slave_0: left allmulticast mode
[   89.208602][ T1130] bridge_slave_0: left promiscuous mode
[   89.214467][ T1130] bridge0: port 1(bridge_slave_0) entered disabled state
[   89.471176][ T1130] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   89.482915][ T1130] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   89.493918][ T1130] bond0 (unregistering): Released all slaves
[   89.606581][ T1130] hsr_slave_0: left promiscuous mode
[   89.614935][ T1130] hsr_slave_1: left promiscuous mode
[   89.621473][ T1130] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   89.629576][ T1130] batman_adv: batadv0: Removing interface: batadv_slave_0
[   89.639972][ T1130] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   89.648991][ T1130] batman_adv: batadv0: Removing interface: batadv_slave_1
[   89.678051][ T1130] veth1_macvtap: left promiscuous mode
[   89.683876][ T1130] veth0_macvtap: left promiscuous mode
[   89.695563][ T1130] veth1_vlan: left promiscuous mode
[   89.701061][ T1130] veth0_vlan: left promiscuous mode
[   90.151748][ T1130] team0 (unregistering): Port device team_slave_1 removed
[   90.180639][ T1130] team0 (unregistering): Port device team_slave_0 removed
2025/12/08 06:08:58 executed programs: 0
[   91.531760][ T5151] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   91.542382][ T5151] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   91.555029][ T5151] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   91.575161][ T5151] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   91.583559][ T5151] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   92.038753][ T5975] chnl_net:caif_netlink_parms(): no params data found
[   92.337812][ T5975] bridge0: port 1(bridge_slave_0) entered blocking state
[   92.353902][ T5975] bridge0: port 1(bridge_slave_0) entered disabled state
[   92.361276][ T5975] bridge_slave_0: entered allmulticast mode
[   92.370465][ T5975] bridge_slave_0: entered promiscuous mode
[   92.390146][ T5975] bridge0: port 2(bridge_slave_1) entered blocking state
[   92.400511][ T5975] bridge0: port 2(bridge_slave_1) entered disabled state
[   92.409232][ T5975] bridge_slave_1: entered allmulticast mode
[   92.419786][ T5975] bridge_slave_1: entered promiscuous mode
[   92.498010][ T5975] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   92.510867][ T5975] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   92.553735][ T5975] team0: Port device team_slave_0 added
[   92.562693][ T5975] team0: Port device team_slave_1 added
[   92.606007][ T5975] batman_adv: batadv0: Adding interface: batadv_slave_0
[   92.613249][ T5975] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[   92.640999][ T5975] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   92.654890][ T5975] batman_adv: batadv0: Adding interface: batadv_slave_1
[   92.661922][ T5975] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[   92.689373][ T5975] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   92.812894][ T5975] hsr_slave_0: entered promiscuous mode
[   92.835971][ T5975] hsr_slave_1: entered promiscuous mode
[   93.511142][ T5975] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   93.527073][ T5975] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   93.539458][ T5975] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   93.552749][ T5975] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   93.636218][   T52] Bluetooth: hci0: command tx timeout
[   93.674308][ T5975] 8021q: adding VLAN 0 to HW filter on device bond0
[   93.699493][ T5975] 8021q: adding VLAN 0 to HW filter on device team0
[   93.713279][ T1167] bridge0: port 1(bridge_slave_0) entered blocking state
[   93.721106][ T1167] bridge0: port 1(bridge_slave_0) entered forwarding state
[   93.749309][ T1167] bridge0: port 2(bridge_slave_1) entered blocking state
[   93.756886][ T1167] bridge0: port 2(bridge_slave_1) entered forwarding state
[   94.005681][ T5975] 8021q: adding VLAN 0 to HW filter on device batadv0
[   94.073867][ T5975] veth0_vlan: entered promiscuous mode
[   94.089021][ T5975] veth1_vlan: entered promiscuous mode
[   94.135082][ T5975] veth0_macvtap: entered promiscuous mode
[   94.148238][ T5975] veth1_macvtap: entered promiscuous mode
[   94.177415][ T5975] batman_adv: batadv0: Interface activated: batadv_slave_0
[   94.196611][ T5975] batman_adv: batadv0: Interface activated: batadv_slave_1
[   94.214009][ T1130] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   94.222880][ T1130] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   94.257357][ T1130] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   94.283049][ T1130] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   94.334841][   T36] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   94.342899][   T36] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   94.399046][   T36] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   94.408247][   T36] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)


syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3183255281=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at d6526ea3e
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d6526ea3e6ad9081c902859bbb80f9f840377cb4\"
/usr/bin/ld: /tmp/ccCOMUne.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null



Tested on:

commit:         82bcd04d Add linux-next specific files for 20251208
git tree:       linux-next
kernel config:  https://syzkaller.appspot.com/x/.config?x=a94030c847137a18
dashboard link: https://syzkaller.appspot.com/bug?extid=f6539d4ce3f775aee0cc
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=122fd21a580000

[PATCH Next] gfs2: update end and prev bio for chain bio

[Edward Adam Davis]

The bios are created and initialized using gfs2_log_alloc_bio() in
gfs2_find_jhead(), which sets bi_end_io and bi_private. When the I/O
request is too large and needs to be split into multiple bios and
submitted as a chain, the bug reported by syzbot [1] is triggered.

When we need to submit multiple bios in a chain, we need to pass the
bi_end_io and bi_private of the previous bio to the end bio to ensure
that the multiple bios are correctly assembled into a submission chain.

[1]
kernel BUG at block/bio.c:342!
Call Trace:
 gfs2_chain_bio fs/gfs2/lops.c:487 [inline]
 gfs2_find_jhead+0x627/0xe40 fs/gfs2/lops.c:549
 gfs2_recover_func+0x5f5/0x1c90 fs/gfs2/recovery.c:459

Fixes: 8a157e0a0aa5 ("gfs2: Fix use of bio_chain")
Reported-by: syzbot+f6539d4ce3f775aee0cc@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=f6539d4ce3f775aee0cc
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
---
 fs/gfs2/lops.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 97ebe457c00a..2de334034c74 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -484,6 +484,10 @@ static struct bio *gfs2_chain_bio(struct bio *prev, unsigned int nr_iovecs)
 	new = bio_alloc(prev->bi_bdev, nr_iovecs, prev->bi_opf, GFP_NOIO);
 	bio_clone_blkg_association(new, prev);
 	new->bi_iter.bi_sector = bio_end_sector(prev);
+	new->bi_end_io = prev->bi_end_io;
+	new->bi_private = prev->bi_private;
+	prev->bi_end_io = NULL;
+	prev->bi_private = NULL;
 	bio_chain(prev, new);
 	submit_bio(prev);
 	return new;
-- 
2.43.0

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#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git
4daba9379bbd702c63459f54ef448746bfeab42d

Re: [PATCH Next] gfs2: update end and prev bio for chain bio

[Andreas Gruenbacher]

Hello,

On Mon, Dec 8, 2025 at 7:12 AM Edward Adam Davis <eadavis@qq.com> wrote:
> The bios are created and initialized using gfs2_log_alloc_bio() in
> gfs2_find_jhead(), which sets bi_end_io and bi_private. When the I/O
> request is too large and needs to be split into multiple bios and
> submitted as a chain, the bug reported by syzbot [1] is triggered.
>
> When we need to submit multiple bios in a chain, we need to pass the
> bi_end_io and bi_private of the previous bio to the end bio to ensure
> that the multiple bios are correctly assembled into a submission chain.
>
> [1]
> kernel BUG at block/bio.c:342!
> Call Trace:
>  gfs2_chain_bio fs/gfs2/lops.c:487 [inline]
>  gfs2_find_jhead+0x627/0xe40 fs/gfs2/lops.c:549
>  gfs2_recover_func+0x5f5/0x1c90 fs/gfs2/recovery.c:459
>
> Fixes: 8a157e0a0aa5 ("gfs2: Fix use of bio_chain")
> Reported-by: syzbot+f6539d4ce3f775aee0cc@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=f6539d4ce3f775aee0cc
> Signed-off-by: Edward Adam Davis <eadavis@qq.com>
> ---
>  fs/gfs2/lops.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
> index 97ebe457c00a..2de334034c74 100644
> --- a/fs/gfs2/lops.c
> +++ b/fs/gfs2/lops.c
> @@ -484,6 +484,10 @@ static struct bio *gfs2_chain_bio(struct bio *prev, unsigned int nr_iovecs)
>         new = bio_alloc(prev->bi_bdev, nr_iovecs, prev->bi_opf, GFP_NOIO);
>         bio_clone_blkg_association(new, prev);
>         new->bi_iter.bi_sector = bio_end_sector(prev);
> +       new->bi_end_io = prev->bi_end_io;
> +       new->bi_private = prev->bi_private;
> +       prev->bi_end_io = NULL;
> +       prev->bi_private = NULL;
>         bio_chain(prev, new);
>         submit_bio(prev);
>         return new;
> --
> 2.43.0
>

thanks for this patch, it looks correct. However, the underlying
problem is that bi_end_io and bi_private are set too early, and if we
change the code to set those fields before submitting the bio, we
won't need this hack in gfs2_chain_bio().

I have pushed patches doing that onto for-next:

  https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git/log/?h=for-next

Does this work for you?

Thanks,
Andreas

Re: [PATCH Next] gfs2: update end and prev bio for chain bio

[Edward Adam Davis]

On Fri, 12 Dec 2025 13:47:40 +0100, Andreas Gruenbacher <agruenba@redhat.com> wrote:
> On Mon, Dec 8, 2025 at 7:12 AM Edward Adam Davis <eadavis@qq.com> wrote:
> > The bios are created and initialized using gfs2_log_alloc_bio() in
> > gfs2_find_jhead(), which sets bi_end_io and bi_private. When the I/O
> > request is too large and needs to be split into multiple bios and
> > submitted as a chain, the bug reported by syzbot [1] is triggered.
> >
> > When we need to submit multiple bios in a chain, we need to pass the
> > bi_end_io and bi_private of the previous bio to the end bio to ensure
> > that the multiple bios are correctly assembled into a submission chain.
> >
> > [1]
> > kernel BUG at block/bio.c:342!
> > Call Trace:
> >  gfs2_chain_bio fs/gfs2/lops.c:487 [inline]
> >  gfs2_find_jhead+0x627/0xe40 fs/gfs2/lops.c:549
> >  gfs2_recover_func+0x5f5/0x1c90 fs/gfs2/recovery.c:459
> >
> > Fixes: 8a157e0a0aa5 ("gfs2: Fix use of bio_chain")
> > Reported-by: syzbot+f6539d4ce3f775aee0cc@syzkaller.appspotmail.com
> > Closes: https://syzkaller.appspot.com/bug?extid=f6539d4ce3f775aee0cc
> > Signed-off-by: Edward Adam Davis <eadavis@qq.com>
> > ---
> >  fs/gfs2/lops.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
> > index 97ebe457c00a..2de334034c74 100644
> > --- a/fs/gfs2/lops.c
> > +++ b/fs/gfs2/lops.c
> > @@ -484,6 +484,10 @@ static struct bio *gfs2_chain_bio(struct bio *prev, unsigned int nr_iovecs)
> >         new = bio_alloc(prev->bi_bdev, nr_iovecs, prev->bi_opf, GFP_NOIO);
> >         bio_clone_blkg_association(new, prev);
> >         new->bi_iter.bi_sector = bio_end_sector(prev);
> > +       new->bi_end_io = prev->bi_end_io;
> > +       new->bi_private = prev->bi_private;
> > +       prev->bi_end_io = NULL;
> > +       prev->bi_private = NULL;
> >         bio_chain(prev, new);
> >         submit_bio(prev);
> >         return new;
> > --
> > 2.43.0
> >
> 
> thanks for this patch, it looks correct. However, the underlying
> problem is that bi_end_io and bi_private are set too early, and if we
> change the code to set those fields before submitting the bio, we
> won't need this hack in gfs2_chain_bio().
> 
> I have pushed patches doing that onto for-next:
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git/log/?h=for-next
> 
> Does this work for you?
I think it's work for me.

BR,
Edward

Re: [PATCH Next] gfs2: update end and prev bio for chain bio

[Andreas Gruenbacher]

On Sun, Dec 14, 2025 at 3:18 AM Edward Adam Davis <eadavis@qq.com> wrote:
> On Fri, 12 Dec 2025 13:47:40 +0100, Andreas Gruenbacher <agruenba@redhat.com> wrote:
> > On Mon, Dec 8, 2025 at 7:12 AM Edward Adam Davis <eadavis@qq.com> wrote:
> > > The bios are created and initialized using gfs2_log_alloc_bio() in
> > > gfs2_find_jhead(), which sets bi_end_io and bi_private. When the I/O
> > > request is too large and needs to be split into multiple bios and
> > > submitted as a chain, the bug reported by syzbot [1] is triggered.
> > >
> > > When we need to submit multiple bios in a chain, we need to pass the
> > > bi_end_io and bi_private of the previous bio to the end bio to ensure
> > > that the multiple bios are correctly assembled into a submission chain.
> > >
> > > [1]
> > > kernel BUG at block/bio.c:342!
> > > Call Trace:
> > >  gfs2_chain_bio fs/gfs2/lops.c:487 [inline]
> > >  gfs2_find_jhead+0x627/0xe40 fs/gfs2/lops.c:549
> > >  gfs2_recover_func+0x5f5/0x1c90 fs/gfs2/recovery.c:459
> > >
> > > Fixes: 8a157e0a0aa5 ("gfs2: Fix use of bio_chain")
> > > Reported-by: syzbot+f6539d4ce3f775aee0cc@syzkaller.appspotmail.com
> > > Closes: https://syzkaller.appspot.com/bug?extid=f6539d4ce3f775aee0cc
> > > Signed-off-by: Edward Adam Davis <eadavis@qq.com>
> > > ---
> > >  fs/gfs2/lops.c | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
> > > index 97ebe457c00a..2de334034c74 100644
> > > --- a/fs/gfs2/lops.c
> > > +++ b/fs/gfs2/lops.c
> > > @@ -484,6 +484,10 @@ static struct bio *gfs2_chain_bio(struct bio *prev, unsigned int nr_iovecs)
> > >         new = bio_alloc(prev->bi_bdev, nr_iovecs, prev->bi_opf, GFP_NOIO);
> > >         bio_clone_blkg_association(new, prev);
> > >         new->bi_iter.bi_sector = bio_end_sector(prev);
> > > +       new->bi_end_io = prev->bi_end_io;
> > > +       new->bi_private = prev->bi_private;
> > > +       prev->bi_end_io = NULL;
> > > +       prev->bi_private = NULL;
> > >         bio_chain(prev, new);
> > >         submit_bio(prev);
> > >         return new;
> > > --
> > > 2.43.0
> > >
> >
> > thanks for this patch, it looks correct. However, the underlying
> > problem is that bi_end_io and bi_private are set too early, and if we
> > change the code to set those fields before submitting the bio, we
> > won't need this hack in gfs2_chain_bio().
> >
> > I have pushed patches doing that onto for-next:
> >
> >   https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git/log/?h=for-next
> >
> > Does this work for you?
>
> I think it's work for me.

It turns out that commit 8a157e0a0aa5 ("gfs2: Fix use of bio_chain")
was bad and needed to be reverted. This means that patch "gfs2: Set
bio->{bi_private,bi_end_ino} late" has been dropped from for-next as
well.

Thanks,
Andreas

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#syz invalid

Hasn't happened in a long while

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#syz invalid

Hasn't happened for a long while

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#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
58717b2a1365

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#syz test

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Subject: 
Author: nogikh@google.com

Let's check if the command works.

#syz test

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Apparently, already fixed.

#syz invalid

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Hasn't been happening in a long while.

#syz invalid

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#syz invalid

hasn't happened in a while

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#syz invalid

It hasn't been happening in a very long time.

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#syz invalid

Actually already fixed

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#syz invalid

Fixed long ago

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#syz invalid

Actually fixed long ago.

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#syz invalid

Doesn't happen for a long time in fact.

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The bug has actually been already fixed.

#syz invalid

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#syz invalid

The bug is actually no longer present.

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The bug is actually fixed long time ago.

#syz invalid

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#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

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#syz test

--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -147,6 +147,7 @@ int dvb_generic_open(struct inode *inode, struct file *file)
                dvbdev->writers--;
        }

+       dvb_device_get(dvbdev);
        dvbdev->users--;
        return 0;
 }
-- 
2.53.0

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#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
master

diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 91fd3673c09a..e588a188f50a 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -126,23 +126,10 @@ static enum hrtimer_restart
xen_timer_callback(struct hrtimer *timer)
 {
 	struct kvm_vcpu *vcpu = container_of(timer, struct kvm_vcpu,
 					     arch.xen.timer);
-	struct kvm_xen_evtchn e;
-	int rc;

 	if (atomic_read(&vcpu->arch.xen.timer_pending))
 		return HRTIMER_NORESTART;

-	e.vcpu_id = vcpu->vcpu_id;
-	e.vcpu_idx = vcpu->vcpu_idx;
-	e.port = vcpu->arch.xen.timer_virq;
-	e.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
-
-	rc = kvm_xen_set_evtchn_fast(&e, vcpu->kvm);
-	if (rc != -EWOULDBLOCK) {
-		vcpu->arch.xen.timer_expires = 0;
-		return HRTIMER_NORESTART;
-	}
-
 	atomic_inc(&vcpu->arch.xen.timer_pending);
 	kvm_make_request(KVM_REQ_UNBLOCK, vcpu);
 	kvm_vcpu_kick(vcpu);

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#syz test

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#syz invalid

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#syz test

---
 fs/minix/inode.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index 7897f5123b3d..bee191c50010 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -171,7 +171,15 @@ static bool minix_check_superblock(struct super_block *sb)
 {
 	struct minix_sb_info *sbi = minix_sb(sb);
 
-	if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
+	if (sbi->s_log_zone_size != 0) {
+		printk("minix-fs error: zone size must equal block size. "
+		       "s_log_zone_size > 0 is not supported.\n");
+		return false;
+	}
+
+	if (sbi->s_imap_blocks < 1 || sbi->s_zmap_blocks < 1 ||
+	    sbi->s_ninodes < 1 || sbi->s_firstdatazone <= 4 ||
+	    sbi->s_firstdatazone >= sbi->s_nzones)
 		return false;
 
 	/*
-- 
2.51.2

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#syz test

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#syz test

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#syz dup: WARNING in ntfs_put_super

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#syz test

---

diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 86a6b317b474..ee1760305380 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -196,8 +196,8 @@ static int hfs_create(struct mnt_idmap *idmap, struct inode *dir,
 	int res;
 
 	inode = hfs_new_inode(dir, &dentry->d_name, mode);
-	if (!inode)
-		return -ENOMEM;
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
 
 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
 	if (res) {
@@ -226,8 +226,8 @@ static struct dentry *hfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 	int res;
 
 	inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
 
 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
 	if (res) {
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 9cd449913dc8..beec6fe7e801 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -186,16 +186,23 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	s64 next_id;
 	s64 file_count;
 	s64 folder_count;
+	int err = -ENOMEM;
 
 	if (!inode)
-		return NULL;
+		goto out_err;
+
+	err = -ENOSPC;
 
 	mutex_init(&HFS_I(inode)->extents_lock);
 	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
 	spin_lock_init(&HFS_I(inode)->open_dir_lock);
 	hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
 	next_id = atomic64_inc_return(&HFS_SB(sb)->next_id);
-	BUG_ON(next_id > U32_MAX);
+	if (next_id > U32_MAX) {
+		pr_err("hfs: next file ID exceeds 32-bit limit — possible "
+		       "superblock corruption");
+		goto out_discard;
+	}
 	inode->i_ino = (u32)next_id;
 	inode->i_mode = mode;
 	inode->i_uid = current_fsuid();
@@ -209,7 +216,11 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	if (S_ISDIR(mode)) {
 		inode->i_size = 2;
 		folder_count = atomic64_inc_return(&HFS_SB(sb)->folder_count);
-		BUG_ON(folder_count > U32_MAX);
+		if (folder_count > U32_MAX) {
+			pr_err("hfs: folder count exceeds 32-bit limit — possible "
+			       "superblock corruption");
+			goto out_discard;
+		}
 		if (dir->i_ino == HFS_ROOT_CNID)
 			HFS_SB(sb)->root_dirs++;
 		inode->i_op = &hfs_dir_inode_operations;
@@ -219,7 +230,11 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	} else if (S_ISREG(mode)) {
 		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
 		file_count = atomic64_inc_return(&HFS_SB(sb)->file_count);
-		BUG_ON(file_count > U32_MAX);
+		if (file_count > U32_MAX) {
+			pr_err("hfs: file count exceeds 32-bit limit — possible "
+			       "superblock corruption");
+			goto out_discard;
+		}
 		if (dir->i_ino == HFS_ROOT_CNID)
 			HFS_SB(sb)->root_files++;
 		inode->i_op = &hfs_file_inode_operations;
@@ -243,6 +258,11 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	hfs_mark_mdb_dirty(sb);
 
 	return inode;
+
+	out_discard:
+		iput(inode);	
+	out_err:
+		return ERR_PTR(err); 
 }
 
 void hfs_delete_inode(struct inode *inode)
@@ -251,7 +271,6 @@ void hfs_delete_inode(struct inode *inode)
 
 	hfs_dbg("ino %lu\n", inode->i_ino);
 	if (S_ISDIR(inode->i_mode)) {
-		BUG_ON(atomic64_read(&HFS_SB(sb)->folder_count) > U32_MAX);
 		atomic64_dec(&HFS_SB(sb)->folder_count);
 		if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 			HFS_SB(sb)->root_dirs--;
@@ -260,7 +279,6 @@ void hfs_delete_inode(struct inode *inode)
 		return;
 	}
 
-	BUG_ON(atomic64_read(&HFS_SB(sb)->file_count) > U32_MAX);
 	atomic64_dec(&HFS_SB(sb)->file_count);
 	if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 		HFS_SB(sb)->root_files--;
diff --git a/fs/hfs/mdb.c b/fs/hfs/mdb.c
index 53f3fae60217..1c3fb631cc8e 100644
--- a/fs/hfs/mdb.c
+++ b/fs/hfs/mdb.c
@@ -273,15 +273,12 @@ void hfs_mdb_commit(struct super_block *sb)
 		/* These parameters may have been modified, so write them back */
 		mdb->drLsMod = hfs_mtime();
 		mdb->drFreeBks = cpu_to_be16(HFS_SB(sb)->free_ablocks);
-		BUG_ON(atomic64_read(&HFS_SB(sb)->next_id) > U32_MAX);
 		mdb->drNxtCNID =
 			cpu_to_be32((u32)atomic64_read(&HFS_SB(sb)->next_id));
 		mdb->drNmFls = cpu_to_be16(HFS_SB(sb)->root_files);
 		mdb->drNmRtDirs = cpu_to_be16(HFS_SB(sb)->root_dirs);
-		BUG_ON(atomic64_read(&HFS_SB(sb)->file_count) > U32_MAX);
 		mdb->drFilCnt =
 			cpu_to_be32((u32)atomic64_read(&HFS_SB(sb)->file_count));
-		BUG_ON(atomic64_read(&HFS_SB(sb)->folder_count) > U32_MAX);
 		mdb->drDirCnt =
 			cpu_to_be32((u32)atomic64_read(&HFS_SB(sb)->folder_count));
 
-- 
2.51.1.dirty

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#syz test

---

diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 86a6b317b474..ee1760305380 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -196,8 +196,8 @@ static int hfs_create(struct mnt_idmap *idmap, struct inode *dir,
 	int res;
 
 	inode = hfs_new_inode(dir, &dentry->d_name, mode);
-	if (!inode)
-		return -ENOMEM;
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
 
 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
 	if (res) {
@@ -226,8 +226,8 @@ static struct dentry *hfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 	int res;
 
 	inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
 
 	res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
 	if (res) {
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index fff149af89da..6808b1316b60 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -273,4 +273,6 @@ static inline void hfs_bitmap_dirty(struct super_block *sb)
 	__bh;						\
 })
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 9cd449913dc8..cb74904994cc 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -186,16 +186,22 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	s64 next_id;
 	s64 file_count;
 	s64 folder_count;
+	int err = -ENOMEM;
 
 	if (!inode)
-		return NULL;
+		goto out_err;
+
+	err = -EFSCORRUPTED;
 
 	mutex_init(&HFS_I(inode)->extents_lock);
 	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
 	spin_lock_init(&HFS_I(inode)->open_dir_lock);
 	hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
 	next_id = atomic64_inc_return(&HFS_SB(sb)->next_id);
-	BUG_ON(next_id > U32_MAX);
+	if (next_id > U32_MAX) {
+		printk(KERN_CRIT "hfs error: next file id on super block is corrupt");
+		goto out_discard;
+	}
 	inode->i_ino = (u32)next_id;
 	inode->i_mode = mode;
 	inode->i_uid = current_fsuid();
@@ -209,7 +215,10 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	if (S_ISDIR(mode)) {
 		inode->i_size = 2;
 		folder_count = atomic64_inc_return(&HFS_SB(sb)->folder_count);
-		BUG_ON(folder_count > U32_MAX);
+		if (folder_count > U32_MAX) {
+			printk(KERN_CRIT "hfs error: folder count on super block is corrupt");
+			goto out_discard;
+		}
 		if (dir->i_ino == HFS_ROOT_CNID)
 			HFS_SB(sb)->root_dirs++;
 		inode->i_op = &hfs_dir_inode_operations;
@@ -219,7 +228,10 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	} else if (S_ISREG(mode)) {
 		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
 		file_count = atomic64_inc_return(&HFS_SB(sb)->file_count);
-		BUG_ON(file_count > U32_MAX);
+		if (file_count > U32_MAX) {
+			printk(KERN_CRIT "hfs error: file count on super block is corrupt");
+			goto out_discard;
+		}
 		if (dir->i_ino == HFS_ROOT_CNID)
 			HFS_SB(sb)->root_files++;
 		inode->i_op = &hfs_file_inode_operations;
@@ -243,6 +255,11 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
 	hfs_mark_mdb_dirty(sb);
 
 	return inode;
+
+	out_discard:
+		iput(inode);	
+	out_err:
+		return ERR_PTR(err); 
 }
 
 void hfs_delete_inode(struct inode *inode)

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---

diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 86a6b317b474..ee1760305380 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -196,8 +196,8 @@ static int hfs_create(struct mnt_idmap *idmap, struct inode *dir,
        int res;
 
        inode = hfs_new_inode(dir, &dentry->d_name, mode);
-       if (!inode)
-               return -ENOMEM;
+       if (IS_ERR(inode))
+               return PTR_ERR(inode);
 
        res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
        if (res) {
@@ -226,8 +226,8 @@ static struct dentry *hfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
        int res;
 
        inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
-       if (!inode)
-               return ERR_PTR(-ENOMEM);
+       if (IS_ERR(inode))
+               return ERR_CAST(inode);
 
        res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
        if (res) {
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index fff149af89da..6808b1316b60 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -273,4 +273,6 @@ static inline void hfs_bitmap_dirty(struct super_block *sb)
        __bh;                                           \
 })
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 9cd449913dc8..ef46a2d29d6a 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -188,7 +188,7 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
        s64 folder_count;
 
        if (!inode)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
 
        mutex_init(&HFS_I(inode)->extents_lock);
        INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
@@ -209,7 +209,10 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
        if (S_ISDIR(mode)) {
                inode->i_size = 2;
                folder_count = atomic64_inc_return(&HFS_SB(sb)->folder_count);
-               BUG_ON(folder_count > U32_MAX);
+               if (folder_count > U32_MAX) {
+                       printk(KERN_CRIT "hfs error: folder count on super block is corrupt");
+                       return ERR_PTR(-EFSCORRUPTED);
+               }
                if (dir->i_ino == HFS_ROOT_CNID)
                        HFS_SB(sb)->root_dirs++;
                inode->i_op = &hfs_dir_inode_operations;
@@ -219,7 +222,10 @@ struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t
        } else if (S_ISREG(mode)) {
                HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
                file_count = atomic64_inc_return(&HFS_SB(sb)->file_count);
-               BUG_ON(file_count > U32_MAX);
+               if (file_count > U32_MAX) {
+                       printk(KERN_CRIT "hfs error: file count on super block is corrupt");
+                       return ERR_PTR(-EFSCORRUPTED);
+               }
                if (dir->i_ino == HFS_ROOT_CNID)
                        HFS_SB(sb)->root_files++;
                inode->i_op = &hfs_file_inode_operations;

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index d54273c3c9ff..ce62cb61186d 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -168,4 +168,6 @@ static inline int minix_test_bit(int nr, const void *vaddr)
 
 #endif
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif /* FS_MINIX_H */
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index a8d5a7e22b7b..f18f7474aca4 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -145,6 +145,12 @@ static int minix_unlink(struct inode * dir, struct dentry *dentry)
        struct minix_dir_entry * de;
        int err;
 
+       if (inode->i_nlink < 1) {
+               printk(KERN_CRIT "minix-fs error: inode (ino: %ld) "
+                      "has corrupted nlink", inode->i_ino);
+               return -EFSCORRUPTED;
+       }
+
        de = minix_find_entry(dentry, &folio);
        if (!de)
                return -ENOENT;
@@ -218,6 +224,13 @@ static int minix_rename(struct mnt_idmap *idmap,
                if (dir_de && !minix_empty_dir(new_inode))
                        goto out_dir;
 
+               err = -EFSCORRUPTED;
+               if (new_inode->i_nlink == 0 || (dir_de && new_inode->i_nlink != 2)) {
+                       printk(KERN_CRIT "minix-fs error: inode (ino: %ld) "
+                              "has corrupted nlink", new_inode->i_ino);
+                       goto out_dir;
+               }
+
                err = -ENOENT;
                new_de = minix_find_entry(new_dentry, &new_folio);
                if (!new_de)

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Subject: 
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#syz test

---

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index aae1f32f4dab..f193912d8632 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -704,8 +704,8 @@ static void ntfs_put_super(struct super_block *sb)
        ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
 
        if (sbi->options) {
+               kfree(sbi->options->nls_name);
                unload_nls(sbi->options->nls);
-               kfree(sbi->options->nls);
                kfree(sbi->options);
                sbi->options = NULL;
        }
@@ -1670,8 +1670,8 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
        iput(inode);
 out:
        if (sbi && sbi->options) {
+               kfree(sbi->options->nls_name);
                unload_nls(sbi->options->nls);
-               kfree(sbi->options->nls);
                kfree(sbi->options);
                sbi->options = NULL;
        }

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Subject: 
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#syz test

---

diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index d54273c3c9ff..ce62cb61186d 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -168,4 +168,6 @@ static inline int minix_test_bit(int nr, const void *vaddr)
 
 #endif
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif /* FS_MINIX_H */
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..493a75eff2c9 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -208,6 +218,13 @@ static int minix_rename(struct mnt_idmap *idmap,
                if (dir_de && !minix_empty_dir(new_inode))
                        goto out_dir;
 
+               err = -EFSCORRUPTED;
+               if (new_inode->i_nlink == 0 || (dir_de && new_inode->i_nlink != 2)) {
+                       printk(KERN_CRIT "minix-fs error: inode (ino: %ld) "
+                              "has corrupted nlink", new_inode->i_ino);
+                       goto out_dir;
+               }
+
                err = -ENOENT;
                new_de = minix_find_entry(new_dentry, &new_folio);
                if (!new_de)

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Subject: 
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#syz test

---
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index d54273c3c9ff..ce62cb61186d 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -168,4 +168,6 @@ static inline int minix_test_bit(int nr, const void *vaddr)
 
 #endif
 
+#define EFSCORRUPTED   EUCLEAN         /* Filesystem is corrupted */
+
 #endif /* FS_MINIX_H */

diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index a8d5a7e22b7b..8648d860ef0c 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -218,6 +218,13 @@ static int minix_rename(struct mnt_idmap *idmap,
                if (dir_de && !minix_empty_dir(new_inode))
                        goto out_dir;
 
+               err = -EFSCORRUPTED;
+               if (dir_de && new_inode->i_nlink != 2) {
+                       printk(KERN_CRIT "minix-fs error: directory inode has "
+                              "corrupted nlink");
+                       goto out_dir;
+               }
+
                err = -ENOENT;
                new_de = minix_find_entry(new_dentry, &new_folio);
                if (!new_de)

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Subject: 
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#syz test

---

diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index a8d5a7e22b7b..8648d860ef0c 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -218,6 +218,13 @@ static int minix_rename(struct mnt_idmap *idmap,
                if (dir_de && !minix_empty_dir(new_inode))
                        goto out_dir;
 
+               err = -EFSCORRUPTED;
+               if (dir_de && new_inode->i_nlink != 2) {
+                       printk(KERN_CRIT "minix-fs error: directory inode has "
+                              "corrupted nlink");
+                       goto out_dir;
+               }
+
                err = -ENOENT;
                new_de = minix_find_entry(new_dentry, &new_folio);
                if (!new_de)

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/minix/minix.h |  2 ++
 fs/minix/namei.c | 26 ++++++++++++++++++--------
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index d54273c3c9ff..ce62cb61186d 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -168,4 +168,6 @@ static inline int minix_test_bit(int nr, const void *vaddr)
 
 #endif
 
+#define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
+
 #endif /* FS_MINIX_H */
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..a8d5a7e22b7b 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -161,15 +161,25 @@ static int minix_unlink(struct inode * dir, struct dentry *dentry)
 static int minix_rmdir(struct inode * dir, struct dentry *dentry)
 {
 	struct inode * inode = d_inode(dentry);
-	int err = -ENOTEMPTY;
-
-	if (minix_empty_dir(inode)) {
-		err = minix_unlink(dir, dentry);
-		if (!err) {
-			inode_dec_link_count(dir);
-			inode_dec_link_count(inode);
-		}
+	int err = -EFSCORRUPTED;
+
+	if (dir->i_nlink <= 2) {
+		printk(KERN_CRIT "minix-fs error: directory inode has "
+		       "corrupted nlink");
+		goto out;
 	}
+
+	err = -ENOTEMPTY;
+	if (!minix_empty_dir(inode))
+		goto out;
+
+	err = minix_unlink(dir, dentry);
+	if (!err) {
+		inode_dec_link_count(dir);
+		inode_dec_link_count(inode);
+ 	}
+
+out:
 	return err;
 }
 
-- 
2.51.1.dirty

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/jfs/jfs_dtree.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 0ab83bb7bbdf..e919de01c42a 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -170,8 +170,8 @@ static void dtGetKey(dtpage_t * p, int i, struct component_name * key,
 static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp,
 			      int ri, struct component_name * key, int flag);
 
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
-			  ddata_t * data, struct dt_lock **);
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+			 ddata_t * data, struct dt_lock **);
 
 static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp,
 			struct dt_lock ** sdtlock, struct dt_lock ** ddtlock,
@@ -891,7 +891,8 @@ int dtInsert(tid_t tid, struct inode *ip,
 	lv->length = 1;
 	dtlck->index++;
 
-	dtInsertEntry(p, index, name, &data, &dtlck);
+	if (!(rc = dtInsertEntry(p, index, name, &data, &dtlck)))
+		return rc;
 
 	/* linelock stbl of non-root leaf page */
 	if (!(p->header.flag & BT_ROOT)) {
@@ -3625,9 +3626,10 @@ static void dtGetKey(dtpage_t * p, int i,	/* entry index */
  * function: allocate free slot(s) and
  *	     write a leaf/internal entry
  *
- * return: entry slot index
+ * * return: 0 - success;
+ *	   errno - failure;
  */
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 			  ddata_t * data, struct dt_lock ** dtlock)
 {
 	struct dtslot *h, *t;
@@ -3649,6 +3651,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* allocate a free slot */
 	hsi = fsi = p->header.freelist;
+	if (fsi >= ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.maxslot)) {
+		jfs_err("Encountered corrupted dtpage before insert");
+		return -EIO;
+	}
 	h = &p->slot[fsi];
 	p->header.freelist = h->next;
 	--p->header.freecnt;
@@ -3697,6 +3703,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 	while (klen) {
 		/* get free slot */
 		fsi = p->header.freelist;
+		if (fsi >= ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.maxslot)) {
+			jfs_err("Encountered corrupted dtpage before insert");
+			return -EIO;
+		}
 		t = &p->slot[fsi];
 		p->header.freelist = t->next;
 		--p->header.freecnt;
@@ -3774,6 +3784,8 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* advance next available entry index of stbl */
 	++p->header.nextindex;
+
+	return 0;
 }
 
 
-- 
2.51.1.dirty

Re: Forwarded:

[Al Viro]

On Tue, Oct 28, 2025 at 10:25:20AM -0700, syzbot wrote:
> For archival purposes, forwarding an incoming command email to
> linux-kernel@vger.kernel.org.

For fuck sake, either generate a more useful subject, or take
that to a separate list just for syzbot use.

Do you really intend to end up in a bunch of .procmailrc?

Forwarded:

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***

Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/jfs/jfs_dtree.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 0ab83bb7bbdf..e919de01c42a 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -170,8 +170,8 @@ static void dtGetKey(dtpage_t * p, int i, struct component_name * key,
 static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp,
 			      int ri, struct component_name * key, int flag);
 
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
-			  ddata_t * data, struct dt_lock **);
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+			 ddata_t * data, struct dt_lock **);
 
 static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp,
 			struct dt_lock ** sdtlock, struct dt_lock ** ddtlock,
@@ -891,7 +891,8 @@ int dtInsert(tid_t tid, struct inode *ip,
 	lv->length = 1;
 	dtlck->index++;
 
-	dtInsertEntry(p, index, name, &data, &dtlck);
+	if (!(rc = dtInsertEntry(p, index, name, &data, &dtlck)))
+		return rc;
 
 	/* linelock stbl of non-root leaf page */
 	if (!(p->header.flag & BT_ROOT)) {
@@ -3625,9 +3626,10 @@ static void dtGetKey(dtpage_t * p, int i,	/* entry index */
  * function: allocate free slot(s) and
  *	     write a leaf/internal entry
  *
- * return: entry slot index
+ * * return: 0 - success;
+ *	   errno - failure;
  */
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 			  ddata_t * data, struct dt_lock ** dtlock)
 {
 	struct dtslot *h, *t;
@@ -3649,6 +3651,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* allocate a free slot */
 	hsi = fsi = p->header.freelist;
+	if (fsi >= ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.maxslot)) {
+		jfs_err("Encountered corrupted dtpage before insert");
+		return -EIO;
+	}
 	h = &p->slot[fsi];
 	p->header.freelist = h->next;
 	--p->header.freecnt;
@@ -3697,6 +3703,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 	while (klen) {
 		/* get free slot */
 		fsi = p->header.freelist;
+		if (fsi >= ((p->header.flag & BT_ROOT) ? DTROOTMAXSLOT : p->header.maxslot)) {
+			jfs_err("Encountered corrupted dtpage before insert");
+			return -EIO;
+		}
 		t = &p->slot[fsi];
 		p->header.freelist = t->next;
 		--p->header.freecnt;
@@ -3774,6 +3784,8 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* advance next available entry index of stbl */
 	++p->header.nextindex;
+
+	return 0;
 }
 
 
-- 
2.51.1.dirty

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 0ab83bb7bbdf..07dd01c79ca2 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -170,8 +170,8 @@ static void dtGetKey(dtpage_t * p, int i, struct component_name * key,
 static int ciGetLeafPrefixKey(dtpage_t * lp, int li, dtpage_t * rp,
 			      int ri, struct component_name * key, int flag);
 
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
-			  ddata_t * data, struct dt_lock **);
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+			 ddata_t * data, struct dt_lock **);
 
 static void dtMoveEntry(dtpage_t * sp, int si, dtpage_t * dp,
 			struct dt_lock ** sdtlock, struct dt_lock ** ddtlock,
@@ -891,7 +891,8 @@ int dtInsert(tid_t tid, struct inode *ip,
 	lv->length = 1;
 	dtlck->index++;
 
-	dtInsertEntry(p, index, name, &data, &dtlck);
+	if (!(rc = dtInsertEntry(p, index, name, &data, &dtlck)))
+		return rc;
 
 	/* linelock stbl of non-root leaf page */
 	if (!(p->header.flag & BT_ROOT)) {
@@ -3627,7 +3628,7 @@ static void dtGetKey(dtpage_t * p, int i,	/* entry index */
  *
  * return: entry slot index
  */
-static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
+static int dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 			  ddata_t * data, struct dt_lock ** dtlock)
 {
 	struct dtslot *h, *t;
@@ -3649,6 +3650,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* allocate a free slot */
 	hsi = fsi = p->header.freelist;
+	if (fsi >= p->header.maxslot) {
+		jfs_err("Encountered corrupted dtpage before insert");
+		return -EIO;
+	}
 	h = &p->slot[fsi];
 	p->header.freelist = h->next;
 	--p->header.freecnt;
@@ -3697,6 +3702,10 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 	while (klen) {
 		/* get free slot */
 		fsi = p->header.freelist;
+		if (fsi >= p->header.maxslot) {
+			jfs_err("Encountered corrupted dtpage before insert");
+			return -EIO;
+		}
 		t = &p->slot[fsi];
 		p->header.freelist = t->next;
 		--p->header.freecnt;
@@ -3774,6 +3783,8 @@ static void dtInsertEntry(dtpage_t * p, int index, struct component_name * key,
 
 	/* advance next available entry index of stbl */
 	++p->header.nextindex;
+
+	return 0;
 }

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Subject: 
Author: kubik.bartlomiej@gmail.com

#syz test

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Subject: 
Author: zlatistiv@gmail.com

#syz test

Forwarded:

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***

Subject: 
Author: clf700383@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master

From 6dc2deb09faf7d53707cc9e75e175b09644fd181 Mon Sep 17 00:00:00 2001
From: clingfei <clf700383@gmail.com>
Date: Mon, 20 Oct 2025 13:48:54 +0800
Subject: [PATCH] fix integer overflow in set_ipsecrequest

syzbot reported a kernel BUG in set_ipsecrequest() due to an skb_over_panic.

The mp->new_family and mp->old_family is u16, while set_ipsecrequest receives
family as uint8_t,  causing a integer overflow and the later size_req calculation
error, which exceeds the size used in alloc_skb, and ultimately triggered the
kernel bug in skb_put.

Reported-by: syzbot+be97dd4da14ae88b6ba4@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=be97dd4da14ae88b6ba4
Signed-off-by: Cheng Lingfei <clf700383@gmail.com>
---
 net/key/af_key.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 2ebde0352245..08f4cde01994 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -3518,7 +3518,7 @@ static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *
 
 static int set_ipsecrequest(struct sk_buff *skb,
 			    uint8_t proto, uint8_t mode, int level,
-			    uint32_t reqid, uint8_t family,
+			    uint32_t reqid, uint16_t family,
 			    const xfrm_address_t *src, const xfrm_address_t *dst)
 {
 	struct sadb_x_ipsecrequest *rq;
-- 
2.34.1

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/minix/inode.c | 14 ++++++++++++++
 fs/minix/namei.c | 22 ++++++++++++++--------
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index f007e389d5d2..e27907fc9bf2 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -517,6 +517,13 @@ static struct inode *V1_minix_iget(struct inode *inode)
 		iget_failed(inode);
 		return ERR_PTR(-ESTALE);
 	}
+	if (S_ISDIR(raw_inode->i_mode) && raw_inode->i_nlinks == 1) {
+		printk("MINIX-fs: directory inode (%lu) has single i_nlink\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-EIO);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
@@ -555,6 +562,13 @@ static struct inode *V2_minix_iget(struct inode *inode)
 		iget_failed(inode);
 		return ERR_PTR(-ESTALE);
 	}
+	if (S_ISDIR(raw_inode->i_mode) && raw_inode->i_nlinks == 1) {
+		printk("MINIX-fs: directory inode (%lu) has single i_nlink\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-EIO);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..8297ee6651a1 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -161,15 +161,21 @@ static int minix_unlink(struct inode * dir, struct dentry *dentry)
 static int minix_rmdir(struct inode * dir, struct dentry *dentry)
 {
 	struct inode * inode = d_inode(dentry);
-	int err = -ENOTEMPTY;
-
-	if (minix_empty_dir(inode)) {
-		err = minix_unlink(dir, dentry);
-		if (!err) {
-			inode_dec_link_count(dir);
-			inode_dec_link_count(inode);
-		}
+	int err = -EIO;
+
+	if (dir->i_nlink <= 2)
+		goto out;
+
+	err = -ENOTEMPTY;
+	if (!minix_empty_dir(inode))
+		goto out;
+
+	err = minix_unlink(dir, dentry);
+	if (!err) {
+		inode_dec_link_count(dir);
+		inode_dec_link_count(inode);
 	}
+out:
 	return err;
 }
 
-- 
2.51.0

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/minix/inode.c | 14 ++++++++++++++
 fs/minix/namei.c | 22 ++++++++++++++--------
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index f007e389d5d2..e27907fc9bf2 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -517,6 +517,13 @@ static struct inode *V1_minix_iget(struct inode *inode)
 		iget_failed(inode);
 		return ERR_PTR(-ESTALE);
 	}
+	if (S_ISDIR(raw_inode->i_mode) && raw_inode->i_nlinks == 1) {
+		printk("MINIX-fs: directory inode (%lu) has single i_nlink\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-EIO);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
@@ -555,6 +562,13 @@ static struct inode *V2_minix_iget(struct inode *inode)
 		iget_failed(inode);
 		return ERR_PTR(-ESTALE);
 	}
+	if (S_ISDIR(raw_inode->i_mode) && raw_inode->i_nlinks == 1) {
+		printk("MINIX-fs: directory inode (%lu) has single i_nlink\n",
+		       inode->i_ino);
+		brelse(bh);
+		iget_failed(inode);
+		return ERR_PTR(-EIO);
+	}
 	inode->i_mode = raw_inode->i_mode;
 	i_uid_write(inode, raw_inode->i_uid);
 	i_gid_write(inode, raw_inode->i_gid);
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..8297ee6651a1 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -161,15 +161,21 @@ static int minix_unlink(struct inode * dir, struct dentry *dentry)
 static int minix_rmdir(struct inode * dir, struct dentry *dentry)
 {
 	struct inode * inode = d_inode(dentry);
-	int err = -ENOTEMPTY;
-
-	if (minix_empty_dir(inode)) {
-		err = minix_unlink(dir, dentry);
-		if (!err) {
-			inode_dec_link_count(dir);
-			inode_dec_link_count(inode);
-		}
+	int err = -EIO;
+
+	if (dir->i_nlink <= 2)
+		goto out;
+
+	err = -ENOTEMPTY;
+	if (!minix_empty_dir(inode))
+		goto out;
+
+	err = minix_unlink(dir, dentry);
+	if (!err) {
+		inode_dec_link_count(dir);
+		inode_dec_link_count(inode);
 	}
+out:
 	return err;
 }
 
-- 
2.51.0

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
fs/minix/namei.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 8938536d8d3c..86779a6ec1a7 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -224,7 +224,7 @@ static int minix_rename(struct mnt_idmap *idmap,
err = minix_add_link(new_dentry, old_inode);
if (err)
goto out_dir;
- if (dir_de)
+ if (dir_de && old_dir != new_dir)
inode_inc_link_count(new_dir);
}
@@ -236,7 +236,7 @@ static int minix_rename(struct mnt_idmap *idmap,
if (dir_de) {
err = minix_set_link(dir_de, dir_folio, new_dir);
- if (!err)
+ if (!err && (new_inode || old_dir != new_dir))
inode_dec_link_count(old_dir);
}
out_dir:
-- 
2.51.0

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/jfs/namei.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 65a218eba8fa..7879c049632b 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1228,7 +1228,7 @@ static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 				jfs_err("jfs_rename: dtInsert returned -EIO");
 			goto out_tx;
 		}
-		if (S_ISDIR(old_ip->i_mode))
+		if (S_ISDIR(old_ip->i_mode) && old_dir != new_dir)
 			inc_nlink(new_dir);
 	}
 	/*
@@ -1244,7 +1244,9 @@ static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		goto out_tx;
 	}
 	if (S_ISDIR(old_ip->i_mode)) {
-		drop_nlink(old_dir);
+		if (new_ip || old_dir != new_dir)
+			drop_nlink(old_dir);
+
 		if (old_dir != new_dir) {
 			/*
 			 * Change inode number of parent for moved directory
-- 
2.51.0

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test

---
 fs/jfs/namei.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 65a218eba8fa..37cd16a423c5 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1228,7 +1228,7 @@ static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 				jfs_err("jfs_rename: dtInsert returned -EIO");
 			goto out_tx;
 		}
-		if (S_ISDIR(old_ip->i_mode))
+		if (S_ISDIR(old_ip->i_mode) && old_dir != new_dir)
 			inc_nlink(new_dir);
 	}
 	/*
@@ -1244,8 +1244,9 @@ static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		goto out_tx;
 	}
 	if (S_ISDIR(old_ip->i_mode)) {
-		drop_nlink(old_dir);
 		if (old_dir != new_dir) {
+			drop_nlink(old_dir);
+
 			/*
 			 * Change inode number of parent for moved directory
 			 */
-- 
2.51.0

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Subject: 
Author: jkoolstra@xs4all.nl

#syz test


 fs/ntfs3/index.c | 10 +++++-----
 fs/ntfs3/ntfs.h  |  5 ++++-
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c
index 6d1bf890929d..2e512abc7000 100644
--- a/fs/ntfs3/index.c
+++ b/fs/ntfs3/index.c
@@ -1808,7 +1808,7 @@ indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni,
 	CLST new_vbn;
 	__le64 t_vbn, *sub_vbn;
 	u16 sp_size;
-	void *hdr1_saved = NULL;
+	void *blk1_saved = NULL;
 
 	/* Try the most easy case. */
 	e = fnd->level - 1 == level ? fnd->de[level] : NULL;
@@ -1842,8 +1842,8 @@ indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni,
 	memcpy(up_e, sp, sp_size);
 
 	used1 = le32_to_cpu(hdr1->used);
-	hdr1_saved = kmemdup(hdr1, used1, GFP_NOFS);
-	if (!hdr1_saved) {
+	blk1_saved = kmemdup(&n1->index->blk, used1, GFP_NOFS);
+	if (!blk1_saved) {
 		err = -ENOMEM;
 		goto out;
 	}
@@ -1924,13 +1924,13 @@ indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni,
 		 * Undo critical operations.
 		 */
 		indx_mark_free(indx, ni, new_vbn >> indx->idx2vbn_bits);
-		memcpy(hdr1, hdr1_saved, used1);
+		memcpy(&n1->index->blk, blk1_saved, used1);
 		indx_write(indx, ni, n1, 0);
 	}
 
 out:
 	kfree(up_e);
-	kfree(hdr1_saved);
+	kfree(blk1_saved);
 
 	return err;
 }
diff --git a/fs/ntfs3/ntfs.h b/fs/ntfs3/ntfs.h
index 552b97905813..d5e2b22eacd7 100644
--- a/fs/ntfs3/ntfs.h
+++ b/fs/ntfs3/ntfs.h
@@ -754,7 +754,10 @@ static inline bool hdr_has_subnode(const struct INDEX_HDR *hdr)
 struct INDEX_BUFFER {
 	struct NTFS_RECORD_HEADER rhdr; // 'INDX'
 	__le64 vbn; // 0x10: vcn if index >= cluster or vsn id index < cluster
-	struct INDEX_HDR ihdr; // 0x18:
+	struct_group(blk,
+		struct INDEX_HDR ihdr; // 0x18:
+	        u8 data[]; // NTFS_DE entries
+	);
 };
 
 static_assert(sizeof(struct INDEX_BUFFER) == 0x28);
-- 
2.51.0

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Subject: 
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#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master

Resending this patch in the existing thread with a '#syz test:' directive
so syzbot can test it.

From 1bb35c6722b8fb03e9262f6e6530d240629a44df Mon Sep 17 00:00:00 2001
From: neqbal <nooraineqbal@gmail.com>
Date: Sun, 28 Sep 2025 03:52:44 +0530
Subject: [PATCH] x86/mm: Fix off-by-one error in set_memory

Correct end page calculation by subtracting 1 to prevent
out-of-bounds access.

Reported-by: syzbot+e34177f6091df113ef20@syzkaller.appspotmail.com
Signed-off-by: neqbal <nooraineqbal@gmail.com>
---
 arch/x86/mm/pat/set_memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index d2d54b8c4dbb..daefc96403f1 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -446,7 +446,7 @@ static void cpa_flush(struct cpa_data *cpa, int cache)
 	}
 
 	start = fix_addr(__cpa_addr(cpa, 0));
-	end =   fix_addr(__cpa_addr(cpa, cpa->numpages));
+	end =   fix_addr(__cpa_addr(cpa, cpa->numpages - 1));
 	if (cpa->force_flush_all)
 		end = TLB_FLUSH_ALL;
 
-- 
2.51.0

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#syz test

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 26d6c1eea559..a879e8030568 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -760,7 +760,7 @@ static int compute_bitstructs(struct gfs2_rgrpd *rgd)
        u32 bytes_left, bytes;
        int x;

-       if (!length)
+       if (!length || length > KMALLOC_MAX_SIZE / sizeof(struct
gfs2_bitmap))
                return -EINVAL;

        rgd->rd_bits = kcalloc(length, sizeof(struct gfs2_bitmap),
GFP_NOFS);

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#syz test

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#syz invalid

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no longer relevant

#syz invalid

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#syz invalid

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#syz test

--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -33,6 +33,12 @@ static int ovl_cleanup_locked(struct dentry *workdir,
struct dentry *dentry)
        struct inode *dir = d_inode(workdir);
        struct inode *inode = d_inode(dentry);

+ /* Avoid unlinking an already unlinked inode */
+ if (inode && inode->i_nlink == 0) {
+ d_drop(dentry);
+ return 0;
+ }
+
        if (ovl_is_whiteout(dentry))
                return ovl_remove_and_whiteout(workdir, dentry, true);

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#syz test

--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -872,6 +872,11 @@ static int ax88772_bind(struct usbnet *dev, struct
usb_interface *intf)
        if (ret < 0)
                return ret;

+ if (ret >= 32) {
+ netdev_warn(dev->net, "Invalid PHY address %d, clamping\n", ret);
+ return -EINVAL;
+ }
+
        priv->phy_addr = ret;
        priv->embd_phy = ((priv->phy_addr & 0x1f) == AX_EMBD_PHY_ADDR);


--

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#syz fix: bcachefs: Don't lock inode around page_symlink

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