* Re: [syzbot] [jfs?] kernel BUG in dtSplitRoot
[not found] <20251207052119.2604297-1-kartikey406@gmail.com>
@ 2025-12-07 5:42 ` syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2025-12-07 5:42 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in dbFree
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 104 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:dbFree+0xba/0x650 fs/jfs/jfs_dmap.c:352
Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 de 34 e0 fe 48 8b 03 48 89 44 24 10 48 8b 44 24 20 48 8d 78 28 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 ba 34 e0 fe 48 8b 44 24 20 48 8b 58 28 48
RSP: 0018:ffffc900018a7a98 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff8880432eaea0 RCX: ffff88801c7ca4c0
RDX: 0000000000000000 RSI: 0000000000000022 RDI: 0000000000000028
RBP: 0000000000000001 R08: ffff88801c7ca4c0 R09: 0000000000000002
R10: 0000000000000040 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000022 R14: ffff888055b49fd0 R15: 1ffff1100ab693fa
FS: 0000000000000000(0000) GS:ffff88808d239000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f908a83f000 CR3: 0000000046fec000 CR4: 0000000000352ef0
Call Trace:
<TASK>
txFreeMap+0x7ff/0xde0 fs/jfs/jfs_txnmgr.c:2539
txUpdateMap+0x308/0x9c0 fs/jfs/jfs_txnmgr.c:-1
txLazyCommit fs/jfs/jfs_txnmgr.c:2669 [inline]
jfs_lazycommit+0x43f/0xa90 fs/jfs/jfs_txnmgr.c:2738
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:dbFree+0xba/0x650 fs/jfs/jfs_dmap.c:352
Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 de 34 e0 fe 48 8b 03 48 89 44 24 10 48 8b 44 24 20 48 8d 78 28 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 ba 34 e0 fe 48 8b 44 24 20 48 8b 58 28 48
RSP: 0018:ffffc900018a7a98 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff8880432eaea0 RCX: ffff88801c7ca4c0
RDX: 0000000000000000 RSI: 0000000000000022 RDI: 0000000000000028
RBP: 0000000000000001 R08: ffff88801c7ca4c0 R09: 0000000000000002
R10: 0000000000000040 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000022 R14: ffff888055b49fd0 R15: 1ffff1100ab693fa
FS: 0000000000000000(0000) GS:ffff88808d239000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa71adff000 CR3: 0000000047507000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: c1 e8 03 shr $0x3,%eax
3: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
8: 74 08 je 0x12
a: 48 89 df mov %rbx,%rdi
d: e8 de 34 e0 fe call 0xfee034f0
12: 48 8b 03 mov (%rbx),%rax
15: 48 89 44 24 10 mov %rax,0x10(%rsp)
1a: 48 8b 44 24 20 mov 0x20(%rsp),%rax
1f: 48 8d 78 28 lea 0x28(%rax),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 05 je 0x36
31: e8 ba 34 e0 fe call 0xfee034f0
36: 48 8b 44 24 20 mov 0x20(%rsp),%rax
3b: 48 8b 58 28 mov 0x28(%rax),%rbx
3f: 48 rex.W
Tested on:
commit: 37bb2e72 Merge tag 'staging-6.19-rc1' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=162efc1a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1889d7812b50029c
dashboard link: https://syzkaller.appspot.com/bug?extid=a099d674daa27a9272db
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=1386221a580000
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] [jfs?] kernel BUG in dtSplitRoot
[not found] <20251207060531.2606558-1-kartikey406@gmail.com>
@ 2025-12-07 6:23 ` syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2025-12-07 6:23 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: task hung in lock_metapage
INFO: task syz.0.24:6012 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.24 state:D stack:26952 pid:6012 tgid:5990 ppid:5740 task_flags:0x400040 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
io_schedule+0x80/0xd0 kernel/sched/core.c:7789
__lock_metapage fs/jfs/jfs_metapage.c:52 [inline]
lock_metapage+0x1f3/0x400 fs/jfs/jfs_metapage.c:66
__get_metapage+0x49a/0xde0 fs/jfs/jfs_metapage.c:748
dtSplitPage+0x1fe/0x3b20 fs/jfs/jfs_dtree.c:1363
dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline]
dtInsert+0x109b/0x5f40 fs/jfs/jfs_dtree.c:871
jfs_create+0x6c8/0xa80 fs/jfs/namei.c:137
lookup_open fs/namei.c:4440 [inline]
open_last_lookups fs/namei.c:4540 [inline]
path_openat+0x18bb/0x3dd0 fs/namei.c:4784
do_filp_open+0x1fa/0x410 fs/namei.c:4814
do_sys_openat2+0x121/0x200 fs/open.c:1430
do_sys_open fs/open.c:1436 [inline]
__do_sys_creat fs/open.c:1514 [inline]
__se_sys_creat fs/open.c:1508 [inline]
__x64_sys_creat+0x8f/0xc0 fs/open.c:1508
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f90d2b8f7c9
RSP: 002b:00007f90d3a54038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f90d2de6090 RCX: 00007f90d2b8f7c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007f90d2c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f90d2de6128 R14: 00007f90d2de6090 R15: 00007fffb4518cc8
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/26:
#0: ffffffff8e1419e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e1419e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e1419e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5126:
#0: ffff88801f6cc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900019962f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460 drivers/tty/n_tty.c:2211
4 locks held by syz.0.24/6012:
#0: ffff888037908420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff888046188578 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline]
#1: ffff888046188578 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: open_last_lookups fs/namei.c:4537 [inline]
#1: ffff888046188578 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: path_openat+0xb47/0x3dd0 fs/namei.c:4784
#2: ffff8880461881c8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_create+0x1f5/0xa80 fs/jfs/namei.c:100
#3: ffff888046186fa8 (&jfs_ip->commit_mutex/1){+.+.}-{4:4}, at: jfs_create+0x210/0xa80 fs/jfs/namei.c:101
2 locks held by dhcpcd/7028:
#0: ffff88801a3ca488 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline]
#0: ffff88801a3ca488 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release net/socket.c:661 [inline]
#0: ffff88801a3ca488 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1455
#1: ffffffff8e147538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#1: ffffffff8e147538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:956
1 lock held by syz.4.463/7030:
2 locks held by dhcpcd/7031:
#0: ffff888052496260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1700 [inline]
#0: ffff888052496260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcd0 net/packet/af_packet.c:3197
#1: ffffffff8e147538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#1: ffffffff8e147538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:956
2 locks held by syz.6.464/7034:
3 locks held by syz.3.465/7035:
1 lock held by dhcpcd/7036:
#0: ffff8880114e0260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1700 [inline]
#0: ffff8880114e0260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcd0 net/packet/af_packet.c:3197
1 lock held by dhcpcd/7037:
#0: ffff8880433ec260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1700 [inline]
#0: ffff8880433ec260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcd0 net/packet/af_packet.c:3197
2 locks held by syz.1.466/7039:
2 locks held by syz.2.467/7041:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 26 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xf95/0xfe0 kernel/hung_task.c:515
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>
Tested on:
commit: 37bb2e72 Merge tag 'staging-6.19-rc1' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10d2a6c2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1889d7812b50029c
dashboard link: https://syzkaller.appspot.com/bug?extid=a099d674daa27a9272db
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=14ee221a580000
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] [jfs?] kernel BUG in dtSplitRoot
[not found] <20251207045701.2600605-1-kartikey406@gmail.com>
@ 2025-12-07 5:14 ` syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2025-12-07 5:14 UTC (permalink / raw)
To: kartikey406, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in txCommit
UFO tlock:0xffffc9000152a678
UFO tlock:0xffffc9000152a3a8
UFO tlock:0xffffc9000152a090
UFO tlock:0xffffc9000152a750
UFO tlock:0xffffc9000152a438
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 6367 Comm: syz.0.152 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:txLog fs/jfs/jfs_txnmgr.c:1395 [inline]
RIP: 0010:txCommit+0xafb/0x5430 fs/jfs/jfs_txnmgr.c:1270
Code: 3c 10 00 74 12 4c 89 f7 e8 72 e1 db fe 48 ba 00 00 00 00 00 fc ff df 4c 89 74 24 68 4d 8b 36 4d 8d 7e 28 4c 89 f8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ff e8 47 e1 db fe 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc900036f7540 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 00000000000009d8 RCX: 1ffff920002a5dd8
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffc9000152a807
RBP: ffffc900036f7710 R08: ffffc900036f7447 R09: 1ffff920006dee88
R10: dffffc0000000000 R11: fffff520006dee89 R12: ffffc9000152a7e6
R13: ffffc9000152a000 R14: 0000000000000000 R15: 0000000000000028
FS: 00007f6c1239e6c0(0000) GS:ffff88808d239000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd6871fb000 CR3: 0000000053d52000 CR4: 0000000000352ef0
Call Trace:
<TASK>
jfs_create+0x865/0xa80 fs/jfs/namei.c:156
lookup_open fs/namei.c:4440 [inline]
open_last_lookups fs/namei.c:4540 [inline]
path_openat+0x18bb/0x3dd0 fs/namei.c:4784
do_filp_open+0x1fa/0x410 fs/namei.c:4814
do_sys_openat2+0x121/0x200 fs/open.c:1430
do_sys_open fs/open.c:1436 [inline]
__do_sys_creat fs/open.c:1514 [inline]
__se_sys_creat fs/open.c:1508 [inline]
__x64_sys_creat+0x8f/0xc0 fs/open.c:1508
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c1158f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6c1239e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f6c117e5fa0 RCX: 00007f6c1158f7c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007f6c11613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c117e6038 R14: 00007f6c117e5fa0 R15: 00007ffff4918648
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLog fs/jfs/jfs_txnmgr.c:1395 [inline]
RIP: 0010:txCommit+0xafb/0x5430 fs/jfs/jfs_txnmgr.c:1270
Code: 3c 10 00 74 12 4c 89 f7 e8 72 e1 db fe 48 ba 00 00 00 00 00 fc ff df 4c 89 74 24 68 4d 8b 36 4d 8d 7e 28 4c 89 f8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ff e8 47 e1 db fe 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc900036f7540 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 00000000000009d8 RCX: 1ffff920002a5dd8
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffc9000152a807
RBP: ffffc900036f7710 R08: ffffc900036f7447 R09: 1ffff920006dee88
R10: dffffc0000000000 R11: fffff520006dee89 R12: ffffc9000152a7e6
R13: ffffc9000152a000 R14: 0000000000000000 R15: 0000000000000028
FS: 00007f6c1239e6c0(0000) GS:ffff88808d239000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fba0d9a0000 CR3: 0000000053d52000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 3c 10 cmp $0x10,%al
2: 00 74 12 4c add %dh,0x4c(%rdx,%rdx,1)
6: 89 f7 mov %esi,%edi
8: e8 72 e1 db fe call 0xfedbe17f
d: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
14: fc ff df
17: 4c 89 74 24 68 mov %r14,0x68(%rsp)
1c: 4d 8b 36 mov (%r14),%r14
1f: 4d 8d 7e 28 lea 0x28(%r14),%r15
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction
2e: 74 12 je 0x42
30: 4c 89 ff mov %r15,%rdi
33: e8 47 e1 db fe call 0xfedbe17f
38: 48 rex.W
39: ba 00 00 00 00 mov $0x0,%edx
3e: 00 fc add %bh,%ah
Tested on:
commit: 37bb2e72 Merge tag 'staging-6.19-rc1' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13a4a6c2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1889d7812b50029c
dashboard link: https://syzkaller.appspot.com/bug?extid=a099d674daa27a9272db
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=159e4eb4580000
^ permalink raw reply [flat|nested] 4+ messages in thread
* [syzbot] [jfs?] kernel BUG in dtSplitRoot
@ 2025-12-06 8:38 syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2025-12-06 8:38 UTC (permalink / raw)
To: jfs-discussion, linux-kernel, shaggy, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 1d18101a644e Merge tag 'kernel-6.19-rc1.cred' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=132812b4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a1db0fea040c2a9f
dashboard link: https://syzkaller.appspot.com/bug?extid=a099d674daa27a9272db
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=14f9e512580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10add512580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-1d18101a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/98f78b52cccd/vmlinux-1d18101a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7a8898061bfb/bzImage-1d18101a.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/1671de9ba119/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=10f9e512580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a099d674daa27a9272db@syzkaller.appspotmail.com
UFO tlock:0xffffc9000152d5e8
BUG at fs/jfs/jfs_dtree.c:1942 assert(dtlck->index == 0)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dtree.c:1942!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5663 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:dtSplitRoot+0x1694/0x16c0 fs/jfs/jfs_dtree.c:1942
Code: e9 49 f3 ff ff e8 2c fc 77 fe 48 c7 c7 e0 88 a4 8b 48 c7 c6 c0 87 a4 8b ba 96 07 00 00 48 c7 c1 60 89 a4 8b e8 3d 01 df fd 90 <0f> 0b e8 05 fc 77 fe 48 c7 c7 e0 88 a4 8b 48 c7 c6 c0 87 a4 8b ba
RSP: 0018:ffffc9000d2972a8 EFLAGS: 00010246
RAX: 0000000000000038 RBX: 0000000000001000 RCX: c529552525a5ed00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000152d6db R08: ffff88801fe24253 R09: 1ffff11003fc484a
R10: dffffc0000000000 R11: ffffed1003fc484b R12: dffffc0000000000
R13: 1ffff920002a5adb R14: 0000000000000002 R15: ffffc9000152d6c0
FS: 0000555582889500(0000) GS:ffff88808d722000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe1757d0e9c CR3: 000000004fc9e000 CR4: 0000000000352ef0
Call Trace:
<TASK>
dtSplitUp fs/jfs/jfs_dtree.c:1244 [inline]
dtInsert+0x2525/0x5f40 fs/jfs/jfs_dtree.c:871
jfs_create+0x6c8/0xa80 fs/jfs/namei.c:137
lookup_open fs/namei.c:3866 [inline]
open_last_lookups fs/namei.c:3965 [inline]
path_openat+0x188f/0x3b80 fs/namei.c:4201
do_filp_open+0x1fa/0x410 fs/namei.c:4231
do_sys_openat2+0x121/0x1c0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_creat fs/open.c:1530 [inline]
__se_sys_creat fs/open.c:1524 [inline]
__x64_sys_creat+0x8f/0xc0 fs/open.c:1524
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94e718f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe798e7728 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f94e73e5fa0 RCX: 00007f94e718f7c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007f94e7213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94e73e5fa0 R14: 00007f94e73e5fa0 R15: 0000000000000002
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dtSplitRoot+0x1694/0x16c0 fs/jfs/jfs_dtree.c:1942
Code: e9 49 f3 ff ff e8 2c fc 77 fe 48 c7 c7 e0 88 a4 8b 48 c7 c6 c0 87 a4 8b ba 96 07 00 00 48 c7 c1 60 89 a4 8b e8 3d 01 df fd 90 <0f> 0b e8 05 fc 77 fe 48 c7 c7 e0 88 a4 8b 48 c7 c6 c0 87 a4 8b ba
RSP: 0018:ffffc9000d2972a8 EFLAGS: 00010246
RAX: 0000000000000038 RBX: 0000000000001000 RCX: c529552525a5ed00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000152d6db R08: ffff88801fe24253 R09: 1ffff11003fc484a
R10: dffffc0000000000 R11: ffffed1003fc484b R12: dffffc0000000000
R13: 1ffff920002a5adb R14: 0000000000000002 R15: ffffc9000152d6c0
FS: 0000555582889500(0000) GS:ffff88808d722000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2ca51ff000 CR3: 000000004fc9e000 CR4: 0000000000352ef0
---
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2025-12-07 5:42 ` [syzbot] [jfs?] kernel BUG in dtSplitRoot syzbot
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2025-12-07 6:23 ` syzbot
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