syzbot


WARNING: locking bug in gfs2_quotad

Status: upstream: reported on 2025/12/22 14:06
Reported-by: syzbot+c959474fb910550349ef@syzkaller.appspotmail.com
First crash: 22d, last: 22d

Sample crash report:
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 1 PID: 4668 at kernel/locking/lockdep.c:201 hlock_class kernel/locking/lockdep.c:-1 [inline]
WARNING: CPU: 1 PID: 4668 at kernel/locking/lockdep.c:201 check_wait_context kernel/locking/lockdep.c:4686 [inline]
WARNING: CPU: 1 PID: 4668 at kernel/locking/lockdep.c:201 __lock_acquire+0x7cd/0x7c60 kernel/locking/lockdep.c:4962
Modules linked in:
CPU: 1 PID: 4668 Comm: gfs2_quotad Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:201 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4686 [inline]
RIP: 0010:__lock_acquire+0x7cd/0x7c60 kernel/locking/lockdep.c:4962
Code: 83 3d 7e 62 0d 0c 00 0f 85 c7 fd ff ff 48 c7 c7 80 1a 0b 8a 48 c7 c6 20 1d 0b 8a e8 0d 21 3b 08 48 ba 00 00 00 00 00 fc ff df <0f> 0b e9 a3 fd ff ff e8 47 ad 7b 02 85 c0 0f 84 5c 0a 00 00 48 c7
RSP: 0018:ffffc9000437f900 EFLAGS: 00010046
RAX: 163094e0fd219b00 RBX: 0000000000001309 RCX: ffff88807f0e8000
RDX: dffffc0000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: ffffc9000437fb50 R08: dffffc0000000000 R09: fffff5200086fe85
R10: fffff5200086fe85 R11: 1ffff9200086fe84 R12: ffff88807f0e8b10
R13: ffff88807f0e8000 R14: 0000000000000000 R15: ffff88807f0e8af0
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000002c8 CR3: 0000000060c9c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
 finish_wait+0xb5/0x1d0 kernel/sched/wait.c:407
 gfs2_quotad+0x703/0x880 fs/gfs2/quota.c:1605
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/22 14:06 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING: locking bug in gfs2_quotad
* Struck through repros no longer work on HEAD.