syzbot
kernel panic: kernel: panic_on_warn set ... (2)
Status:
upstream: reported on 2026/07/07 08:59
Reported-by: syzbot+2488c844558affa7e17a@syzkaller.appspotmail.com
First crash: 82d, last: 6d09h
Sample crash report:
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f26bc97de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f26bc97dee0 RCX: 00007f26be7273ca
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007f26bc97dea0
RBP: 0000200000000000 R08: 00007f26bc97dee0 R09: 0000000002010019
R10: 0000000002010019 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f26bc97dea0 R14: 0000000000005513 R15: 0000200000006ac0
</TASK>
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 1 PID: 5175 Comm: syz.4.225 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
panic+0x2f8/0x850 kernel/panic.c:309
check_panic_on_warn kernel/panic.c:229 [inline]
__warn+0x248/0x2b0 kernel/panic.c:680
report_bug+0x1b9/0x2e0 lib/bug.c:199
handle_bug+0x3a/0x70 arch/x86/kernel/traps.c:239
exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:259
asm_exc_invalid_op+0x16/0x20 arch/x86/include/asm/idtentry.h:604
RIP: 0010:lockdep_unregister_key+0x4d7/0x520 kernel/locking/lockdep.c:6327
Code: 80 00 00 00 75 39 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 19 a2 63 08 41 f7 c4 00 02 00 00 74 90 fb 84 db 75 8f eb a0 <0f> 0b e9 44 ff ff ff 0f 0b e9 b0 fe ff ff 0f 0b e9 fd fe ff ff e8
RSP: 0018:ffffc9000369f9c0 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffff88802b34d728 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc9000369f940
RBP: ffffc9000369fa90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520006d3f28 R12: 0000000000000202
R13: ffff88802b34c000 R14: 0000000000000000 R15: 1ffff920006d3f3c
f2fs_fill_super+0x3ce4/0x7050 fs/f2fs/super.c:4536
mount_bdev+0x28a/0x3c0 fs/super.c:1411
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1541
do_new_mount+0x247/0xa40 fs/namespace.c:3034
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f26be7273ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f26bc97de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f26bc97dee0 RCX: 00007f26be7273ca
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007f26bc97dea0
RBP: 0000200000000000 R08: 00007f26bc97dee0 R09: 0000000002010019
R10: 0000000002010019 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f26bc97dea0 R14: 0000000000005513 R15: 0000200000006ac0
</TASK>
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..
----------------
Code disassembly (best guess):
0: 48 c7 c2 e8 ff ff ff mov $0xffffffffffffffe8,%rdx
7: f7 d8 neg %eax
9: 64 89 02 mov %eax,%fs:(%rdx)
c: b8 ff ff ff ff mov $0xffffffff,%eax
11: c3 ret
12: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
19: 00 00 00
1c: 0f 1f 40 00 nopl 0x0(%rax)
20: 49 89 ca mov %rcx,%r10
23: b8 a5 00 00 00 mov $0xa5,%eax
28: 0f 05 syscall
* 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction
30: 73 01 jae 0x33
32: c3 ret
33: 48 c7 c1 e8 ff ff ff mov $0xffffffffffffffe8,%rcx
3a: f7 d8 neg %eax
3c: 64 89 01 mov %eax,%fs:(%rcx)
3f: 48 rex.W
Struck through repros no longer work on HEAD.