syzbot


WARNING: locking bug in gfs2_quotad

Status: upstream: reported on 2026/01/30 04:46
Reported-by: syzbot+2f84a38870fecbe1ad2c@syzkaller.appspotmail.com
First crash: 147d, last: 3d07h
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING: locking bug in gfs2_quotad (2) 4 1 69d 69d 0/3 upstream: reported on 2026/04/18 05:34
linux-5.15 WARNING: locking bug in gfs2_quotad 4 1 186d 186d 0/3 auto-obsoleted due to no activity on 2026/04/01 14:07

Sample crash report:
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 6861 at kernel/locking/lockdep.c:232 hlock_class kernel/locking/lockdep.c:-1 [inline]
WARNING: CPU: 0 PID: 6861 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4723 [inline]
WARNING: CPU: 0 PID: 6861 at kernel/locking/lockdep.c:232 __lock_acquire+0x7e5/0x7bd0 kernel/locking/lockdep.c:4999
Modules linked in:
CPU: 0 PID: 6861 Comm: gfs2_quotad Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:232 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4723 [inline]
RIP: 0010:__lock_acquire+0x7e5/0x7bd0 kernel/locking/lockdep.c:4999
Code: 83 3d 66 43 bc 0c 00 0f 85 d0 fd ff ff 48 c7 c7 40 16 8c 8a 48 c7 c6 e0 18 8c 8a e8 b5 b7 e9 ff 48 ba 00 00 00 00 00 fc ff df <0f> 0b e9 ac fd ff ff e8 5f c5 a8 02 85 c0 0f 84 77 0a 00 00 48 c7
RSP: 0018:ffffc90003ac7940 EFLAGS: 00010046
RAX: e7dd8cc164932000 RBX: 0000000000000dc1 RCX: ffff88802e859e00
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc90003ac7b70 R08: ffff8880b8e279db R09: 1ffff110171c4f3b
R10: dffffc0000000000 R11: ffffed10171c4f3c R12: ffff88802e85a900
R13: ffff88802e859e00 R14: 0000000000000000 R15: 0000000000000dc1
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01cec87000 CR3: 0000000055249000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
 finish_wait+0xbb/0x1c0 kernel/sched/wait.c:410
 gfs2_quotad+0x501/0x690 fs/gfs2/quota.c:1579
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/23 09:20 linux-6.1.y fdb6fcb41cc7 5a630be6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: locking bug in gfs2_quotad
2026/04/23 17:24 linux-6.1.y 7c87defbd336 4c3406dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: locking bug in gfs2_quotad
2026/04/23 03:40 linux-6.1.y 7c87defbd336 b10da5ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: locking bug in gfs2_quotad
2026/03/06 16:33 linux-6.1.y f2ddafa93a25 41d8037d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: locking bug in gfs2_quotad
2026/01/30 04:46 linux-6.1.y cd9b81672742 bfa73b7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: locking bug in gfs2_quotad
* Struck through repros no longer work on HEAD.