syzbot


WARNING in reiserfs_lookup

Status: upstream: reported on 2025/09/25 10:32
Reported-by: syzbot+58f6935ad913305afffd@syzkaller.appspotmail.com
First crash: 23h56m, last: 23h56m
Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in reiserfs_lookup -1 3 795d 836d 0/3 auto-obsoleted due to no activity on 2023/10/31 18:44
linux-6.1 WARNING in reiserfs_lookup -1 6 530d 700d 0/3 auto-obsoleted due to no activity on 2024/07/23 04:34
upstream WARNING in reiserfs_lookup bfs -1 C inconclusive done 1259 618d 1127d 0/29 auto-obsoleted due to no activity on 2024/04/28 17:50
linux-5.15 WARNING in reiserfs_lookup (2) missing-backport origin:upstream -1 C error 19 6d16h 544d 0/3 upstream: reported C repro on 2024/03/31 03:45
linux-6.1 WARNING in reiserfs_lookup (2) -1 6 52d 135d 0/3 upstream: reported on 2025/05/13 14:33

Sample crash report:
loop0: detected capacity change from 0 to 32768
 ... Log Wrap ... Log Wrap ... Log Wrap ...
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 6207 at kernel/locking/mutex.c:582 __mutex_lock_common kernel/locking/mutex.c:582 [inline]
WARNING: CPU: 0 PID: 6207 at kernel/locking/mutex.c:582 __mutex_lock+0xb8c/0xcc0 kernel/locking/mutex.c:747
Modules linked in:
CPU: 0 PID: 6207 Comm: syz.0.14103 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:582 [inline]
RIP: 0010:__mutex_lock+0xb8c/0xcc0 kernel/locking/mutex.c:747
Code: 04 08 84 c0 0f 85 20 01 00 00 83 3d 4d c0 d3 03 00 0f 85 81 f5 ff ff 48 c7 c7 40 a7 aa 8a 48 c7 c6 e0 a7 aa 8a e8 a4 17 d9 f6 <0f> 0b e9 67 f5 ff ff 0f 0b e9 47 f9 ff ff 0f 0b e9 ff f5 ff ff 48
RSP: 0018:ffffc9000c60f540 EFLAGS: 00010246
RAX: 2ec3fa7556c0d500 RBX: ffff88802429d828 RCX: 0000000000080000
RDX: ffffc900128f9000 RSI: 0000000000003ea4 RDI: 0000000000003ea5
RBP: ffffc9000c60f6a0 R08: ffff8880b8e28c13 R09: 1ffff110171c5182
R10: dffffc0000000000 R11: ffffed10171c5183 R12: 0000000000000000
R13: 1ffff920018c1eb8 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007fd7fd87c6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33f1fff8 CR3: 000000005f222000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 reiserfs_write_lock+0x79/0xd0 fs/reiserfs/lock.c:27
 reiserfs_lookup+0x151/0x520 fs/reiserfs/namei.c:364
 __lookup_slow+0x281/0x3b0 fs/namei.c:1694
 lookup_slow+0x53/0x70 fs/namei.c:1711
 walk_component+0x2be/0x3f0 fs/namei.c:2002
 lookup_last fs/namei.c:2459 [inline]
 path_lookupat+0x169/0x440 fs/namei.c:2483
 filename_lookup+0x1f4/0x510 fs/namei.c:2512
 user_path_at_empty+0x42/0x60 fs/namei.c:2909
 user_path_at include/linux/namei.h:57 [inline]
 path_removexattr+0x11f/0x3f0 fs/xattr.c:924
 __do_sys_removexattr fs/xattr.c:943 [inline]
 __se_sys_removexattr fs/xattr.c:940 [inline]
 __x64_sys_removexattr+0x60/0x70 fs/xattr.c:940
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd7fc98eec9
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:00007fd7fd87c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c5
RAX: ffffffffffffffda RBX: 00007fd7fcbe5fa0 RCX: 00007fd7fc98eec9
RDX: 0000000000000000 RSI: 0000200000000a40 RDI: 0000200000000480
RBP: 00007fd7fca11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd7fcbe6038 R14: 00007fd7fcbe5fa0 R15: 00007ffc40109388
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/25 10:32 linux-6.6.y 147338df3487 0abd0691 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in reiserfs_lookup
* Struck through repros no longer work on HEAD.