Re: [syzbot] [bpf?] general protection fault in btf_type_show

[syzbot <syzbot+37b56485bbbf90ad8489@syzkaller.appspotmail.com>]

Hello,

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

0] (64MB)
[    4.567255][    T1] ACPI: bus type thunderbolt registered
[    4.571676][    T1] RAPL PMU: API unit is 2^-32 Joules, 0 fixed counters, 10737418240 ms ovfl timer
[    4.712224][    T1] kvm_amd: CPU 1 isn't AMD or Hygon
[    4.712289][    T1] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x257a472b559, max_idle_ns: 440795210424 ns
[    4.723080][    T1] clocksource: Switched to clocksource tsc
[    4.769903][    T1] Initialise system trusted keyrings
[    4.771469][    T1] workingset: timestamp_bits=40 (anon: 35) max_order=20 bucket_order=0 (anon: 0)
[    4.782355][    T1] DLM installed
[    4.788684][    T1] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    4.797661][    T1] NFS: Registering the id_resolver key type
[    4.797817][    T1] Key type id_resolver registered
[    4.797827][    T1] Key type id_legacy registered
[    4.798151][    T1] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[    4.798274][    T1] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver Registering...
[    4.803524][    T1] smbdirect: subsystem loading...
[    4.815913][    T1] smbdirect: subsystem loaded
[    4.838963][    T1] Key type cifs.spnego registered
[    4.839248][    T1] Key type cifs.idmap registered
[    4.843752][    T1] ntfs3: Enabled Linux POSIX ACLs support
[    4.843767][    T1] ntfs3: Read-only LZX/Xpress compression included
[    4.844171][    T1] jffs2: version 2.2. (NAND) (SUMMARY)  © 2001-2006 Red Hat, Inc.
[    4.849521][    T1] romfs: ROMFS MTD (C) 2007 Red Hat, Inc.
[    4.849798][    T1] QNX4 filesystem 0.2.3 registered.
[    4.849911][    T1] qnx6: QNX6 filesystem 1.0.0 registered.
[    4.851532][    T1] fuse: init (API version 7.46)
[    4.856255][    T1] orangefs_debugfs_init: called with debug mask: :none: :0:
[    4.857870][    T1] orangefs_init: module version upstream loaded
[    4.859486][    T1] JFS: nTxBlock = 8192, nTxLock = 65536
[    4.873365][    T1] SGI XFS with ACLs, security attributes, realtime, scrub, repair, quota, no debug enabled
[    4.882267][    T1] 9p: Installing v9fs 9p2000 file system support
[    4.883084][    T1] NILFS version 2 loaded
[    4.883096][    T1] befs: version: 0.9.3
[    4.884100][    T1] ocfs2: Registered cluster interface o2cb
[    4.885087][    T1] ocfs2: Registered cluster interface user
[    4.887781][    T1] OCFS2 User DLM kernel interface loaded
[    4.910089][    T1] gfs2: GFS2 installed
[    4.926852][    T1] ceph: loaded (mds proto 32)
[    4.938722][    T1] NET: Registered PF_ALG protocol family
[    4.944425][    T1] async_tx: api initialized (async)
[    4.947567][    T1] Key type asymmetric registered
[    4.947642][    T1] Asymmetric key parser 'x509' registered
[    4.947651][    T1] Asymmetric key parser 'pkcs8' registered
[    4.947662][    T1] Key type pkcs7_test registered
[    4.948254][    T1] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 239)
[    4.959622][    T1] io scheduler mq-deadline registered
[    4.959643][    T1] io scheduler kyber registered
[    4.960021][    T1] io scheduler bfq registered
[    4.960791][    T1] raid6: skipped pq benchmark and selected avx512x4
[    5.000642][    T1] ACPI: \_SB_.GSIE: Enabled at IRQ 20
[    5.008282][    T1] pcieport 0000:00:04.0: PME: Signaling with IRQ 25
[    5.022665][    T1] pcieport 0000:00:04.0: AER: enabled with IRQ 26
[    5.030510][    T1] input: Power Button as /devices/platform/LNXPWRBN:00/input/input0
[    5.031822][    T1] ACPI: button: Power Button [PWRF]
[    5.411719][    T1] ioatdma: Intel(R) QuickData Technology Driver 5.00
[    5.457084][    T1] ACPI: \_SB_.GSIF: Enabled at IRQ 21
[    5.508969][    T1] ACPI: \_SB_.GSIH: Enabled at IRQ 23
[    5.900182][    T1] N_HDLC line discipline registered with maxframe=4096
[    5.901075][    T1] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    5.909262][    T1] 00:04: ttyS0 I/O:0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    5.964523][    T1] Non-volatile memory driver v1.3
[    5.975391][    T1] usbcore: registered new interface driver xillyusb
[    5.982154][    T1] ACPI: bus type drm_connector registered
[    5.989648][    T1] [drm] Initialized vgem 1.0.0 for vgem on minor 0
[    5.990270][    T1] usbcore: registered new interface driver udl
[    5.992839][    T1] [drm] pci: virtio-vga detected at 0000:00:01.0
[    5.993007][    T1] virtio-pci 0000:00:01.0: vgaarb: deactivate vga console
[    6.017037][    T1] Console: switching to colour dummy device 80x25
[    6.019213][    T1] [drm] features: -virgl +edid -resource_blob -host_visible
[    6.019231][ 
** replaying previous printk message **
[    6.019231][    T1] [drm] features: -context_init -blob_alignment
[    6.025829][    T1] [drm] number of scanouts: 1
[    6.025865][    T1] [drm] number of cap sets: 0
[    6.029842][    T1] ------------[ cut here ]------------
[    6.029854][    T1] [PLANE:36:plane-1] pixel format with alpha exposed but blend mode not setup
[    6.029861][    T1] WARNING: drivers/gpu/drm/drm_mode_config.c:872 at drm_mode_config_validate+0xfb4/0x1be0, CPU#2: swapper/0/1
[    6.061997][    T1] Modules linked in:
[    6.064261][    T1] CPU: 2 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
[    6.070691][    T1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[    6.078075][    T1] RIP: 0010:drm_mode_config_validate+0xfbb/0x1be0
[    6.082440][    T1] Code: 00 49 8b 57 18 48 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 00 0b 00 00 48 8d 3d ec 61 7e 0b 41 8b b7 c8 00 00 00 <67> 48 0f b9 3a e9 fa fd ff ff 48 8b 5c 24 20 e8 01 e5 39 fc 48 8d
[    6.096218][    T1] RSP: 0000:ffffc90000047908 EFLAGS: 00010246
[    6.099910][    T1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[    6.104920][    T1] RDX: ffff8880273a67c0 RSI: 0000000000000024 RDI: ffffffff915052c0
[    6.110226][    T1] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[    6.116916][    T1] R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1004f49023
[    6.122713][    T1] R13: ffffed1004f49024 R14: 0000000000000001 R15: ffff888027a48028
[    6.128117][    T1] FS:  0000000000000000(0000) GS:ffff8880d5d6a000(0000) knlGS:0000000000000000
[    6.134099][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.138978][    T1] CR2: 0000000000000000 CR3: 000000000eb96000 CR4: 0000000000352ef0
[    6.143685][    T1] Call Trace:
[    6.145773][    T1]  <TASK>
[    6.147340][    T1]  ? queue_work_on+0xd7/0x1e0
[    6.149798][    T1]  drm_dev_register+0x56e/0x7b0
[    6.152299][    T1]  ? aperture_remove_conflicting_pci_devices+0x138/0x1e0
[    6.156137][    T1]  virtio_gpu_probe+0x271/0x360
[    6.159302][    T1]  virtio_dev_probe+0x6a2/0xbe0
[    6.162577][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    6.166687][    T1]  ? kernfs_create_link+0x1bd/0x240
[    6.170072][    T1]  ? kernfs_put+0x3f/0x60
[    6.172900][    T1]  ? sysfs_do_create_link_sd+0xbb/0x140
[    6.176855][    T1]  ? sysfs_create_link+0x68/0xc0
[    6.179819][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    6.183189][    T1]  really_probe+0x241/0xa60
[    6.185957][    T1]  __driver_probe_device+0x210/0x460
[    6.189219][    T1]  ? _raw_spin_unlock_irqrestore+0x52/0x80
[    6.192389][    T1]  driver_probe_device+0x4a/0x140
[    6.195943][    T1]  __driver_attach+0x21f/0x5b0
[    6.199182][    T1]  ? __pfx___driver_attach+0x10/0x10
[    6.202648][    T1]  bus_for_each_dev+0x13e/0x1d0
[    6.205679][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    6.208681][    T1]  ? bus_add_driver+0x2b5/0x5b0
[    6.211758][    T1]  bus_add_driver+0x305/0x5b0
[    6.214657][    T1]  driver_register+0x1e2/0x360
[    6.217563][    T1]  ? __pfx_virtio_gpu_driver_init+0x10/0x10
[    6.221754][    T1]  virtio_gpu_driver_init+0xc9/0x170
[    6.225188][    T1]  do_one_initcall+0x11c/0x6f0
[    6.228719][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    6.232297][    T1]  ? kernel_init_freeable+0x4ca/0x7b0
[    6.236427][    T1]  kernel_init_freeable+0x6ea/0x7b0
[    6.239858][    T1]  ? __pfx_kernel_init+0x10/0x10
[    6.242779][    T1]  kernel_init+0x21/0x1e0
[    6.245219][    T1]  ? __pfx_kernel_init+0x10/0x10
[    6.248172][    T1]  ret_from_fork+0x730/0xd60
[    6.250865][    T1]  ? __pfx_ret_from_fork+0x10/0x10
[    6.254420][    T1]  ? __switch_to+0x800/0x10f0
[    6.257968][    T1]  ? __pfx_kernel_init+0x10/0x10
[    6.261119][    T1]  ret_from_fork_asm+0x1a/0x30
[    6.264119][    T1]  </TASK>
[    6.265934][    T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[    6.267938][    T1] CPU: 2 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
[    6.267938][    T1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[    6.267938][    T1] Call Trace:
[    6.267938][    T1]  <TASK>
[    6.287547][    T1]  dump_stack_lvl+0x100/0x190
[    6.287547][    T1]  vpanic+0x553/0x970
[    6.287547][    T1]  ? __pfx_vpanic+0x10/0x10
[    6.287547][    T1]  panic+0xd1/0xe0
[    6.297598][    T1]  ? __pfx_panic+0x10/0x10
[    6.297598][    T1]  check_panic_on_warn.cold+0x19/0x34
[    6.297598][    T1]  ? drm_mode_config_validate+0xfb4/0x1be0
[    6.307492][    T1]  __warn.cold+0x191/0x318
[    6.307492][    T1]  __report_bug+0x30f/0x440
[    6.307492][    T1]  ? drm_mode_config_validate+0xfb4/0x1be0
[    6.307492][    T1]  ? __pfx___report_bug+0x10/0x10
[    6.317574][    T1]  ? __pfx___might_resched+0x10/0x10
[    6.317574][    T1]  ? schedule_timeout+0x161/0x280
[    6.317574][    T1]  report_bug_entry+0xe2/0x290
[    6.327541][    T1]  ? drm_mode_config_validate+0xfbb/0x1be0
[    6.327541][    T1]  handle_bug+0x1cd/0x2a0
[    6.327541][    T1]  exc_invalid_op+0x17/0x50
[    6.327541][    T1]  asm_exc_invalid_op+0x1a/0x20
[    6.337559][    T1] RIP: 0010:drm_mode_config_validate+0xfbb/0x1be0
[    6.337559][    T1] Code: 00 49 8b 57 18 48 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 00 0b 00 00 48 8d 3d ec 61 7e 0b 41 8b b7 c8 00 00 00 <67> 48 0f b9 3a e9 fa fd ff ff 48 8b 5c 24 20 e8 01 e5 39 fc 48 8d
[    6.347488][    T1] RSP: 0000:ffffc90000047908 EFLAGS: 00010246
[    6.347488][    T1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[    6.347488][    T1] RDX: ffff8880273a67c0 RSI: 0000000000000024 RDI: ffffffff915052c0
[    6.347488][    T1] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[    6.367557][    T1] R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1004f49023
[    6.367557][    T1] R13: ffffed1004f49024 R14: 0000000000000001 R15: ffff888027a48028
[    6.377557][    T1]  ? drm_mode_config_validate+0xf76/0x1be0
[    6.377557][    T1]  ? queue_work_on+0xd7/0x1e0
[    6.377557][    T1]  drm_dev_register+0x56e/0x7b0
[    6.387488][    T1]  ? aperture_remove_conflicting_pci_devices+0x138/0x1e0
[    6.387488][    T1]  virtio_gpu_probe+0x271/0x360
[    6.387488][    T1]  virtio_dev_probe+0x6a2/0xbe0
[    6.397590][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    6.397590][    T1]  ? kernfs_create_link+0x1bd/0x240
[    6.397590][    T1]  ? kernfs_put+0x3f/0x60
[    6.407511][    T1]  ? sysfs_do_create_link_sd+0xbb/0x140
[    6.407511][    T1]  ? sysfs_create_link+0x68/0xc0
[    6.407511][    T1]  ? __pfx_virtio_dev_probe+0x10/0x10
[    6.407511][    T1]  really_probe+0x241/0xa60
[    6.417623][    T1]  __driver_probe_device+0x210/0x460
[    6.417623][    T1]  ? _raw_spin_unlock_irqrestore+0x52/0x80
[    6.417623][    T1]  driver_probe_device+0x4a/0x140
[    6.427481][    T1]  __driver_attach+0x21f/0x5b0
[    6.427481][    T1]  ? __pfx___driver_attach+0x10/0x10
[    6.427481][    T1]  bus_for_each_dev+0x13e/0x1d0
[    6.427481][    T1]  ? __pfx_bus_for_each_dev+0x10/0x10
[    6.427481][    T1]  ? bus_add_driver+0x2b5/0x5b0
[    6.427481][    T1]  bus_add_driver+0x305/0x5b0
[    6.427481][    T1]  driver_register+0x1e2/0x360
[    6.447489][    T1]  ? __pfx_virtio_gpu_driver_init+0x10/0x10
[    6.447489][    T1]  virtio_gpu_driver_init+0xc9/0x170
[    6.447489][    T1]  do_one_initcall+0x11c/0x6f0
[    6.447489][    T1]  ? __pfx_do_one_initcall+0x10/0x10
[    6.447489][    T1]  ? kernel_init_freeable+0x4ca/0x7b0
[    6.447489][    T1]  kernel_init_freeable+0x6ea/0x7b0
[    6.447489][    T1]  ? __pfx_kernel_init+0x10/0x10
[    6.467481][    T1]  kernel_init+0x21/0x1e0
[    6.467481][    T1]  ? __pfx_kernel_init+0x10/0x10
[    6.467481][    T1]  ret_from_fork+0x730/0xd60
[    6.467481][    T1]  ? __pfx_ret_from_fork+0x10/0x10
[    6.477554][    T1]  ? __switch_to+0x800/0x10f0
[    6.477554][    T1]  ? __pfx_kernel_init+0x10/0x10
[    6.477554][    T1]  ret_from_fork_asm+0x1a/0x30
[    6.487531][    T1]  </TASK>
[    6.487531][    T1] Kernel Offset: disabled
[    6.487531][    T1] Rebooting in 86400 seconds..


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-build1831899048=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/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='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 1e72964b011
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=1e72964b0111319984575e60f266d1fa0a98abb5 -X github.com/google/syzkaller/prog.gitRevisionDate=20260817-123423"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=1e72964b0111319984575e60f266d1fa0a98abb5 -X github.com/google/syzkaller/prog.gitRevisionDate=20260817-123423"  ./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=1e72964b0111319984575e60f266d1fa0a98abb5 -X github.com/google/syzkaller/prog.gitRevisionDate=20260817-123423"  -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=\"1e72964b0111319984575e60f266d1fa0a98abb5\"
/usr/bin/ld: /tmp/ccxPxrYX.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): 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


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=10b01979580000


Tested on:

commit:         73e3f071 Merge tag 'nfs-for-7.3-1' of git://git.linux-..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=c2d3e2a7997c1d5c
dashboard link: https://syzkaller.appspot.com/bug?extid=37b56485bbbf90ad8489
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14ff8d49580000