WARNING in reiserfs_lookup (2)

Status: upstream: reported C repro on 2024/03/31 03:45
Bug presence: origin:lts-only
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+00b28ba809541778dca3@syzkaller.appspotmail.com
First crash: 864d, last: 1d15h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/07/11 linux-5.15.y (ToT) c86c4726e7f0 C [report] WARNING in reiserfs_lookup
2026/07/11 upstream (ToT) dd3210c47e8d C Didn't crash
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in reiserfs_lookup -1 10 72d 321d 0/2 upstream: reported on 2025/09/25 10:32
linux-5.15 WARNING in reiserfs_lookup -1 3 1116d 1157d 0/3 auto-obsoleted due to no activity on 2023/10/31 18:44
linux-6.1 WARNING in reiserfs_lookup -1 6 850d 1020d 0/3 auto-obsoleted due to no activity on 2024/07/23 04:34
upstream WARNING in reiserfs_lookup bfs -1 syz, C inconclusive done 1259 939d 1448d 0/29 auto-obsoleted due to no activity on 2024/04/28 17:50
linux-6.1 WARNING in reiserfs_lookup (2) -1 19 13d 456d 0/3 upstream: reported on 2025/05/13 14:33
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2026/08/11 06:00 18m retest repro linux-5.15.y report log
2026/05/07 11:08 17m retest repro linux-5.15.y report log
2026/02/07 16:29 14m retest repro linux-5.15.y report log
2025/11/29 09:24 13m retest repro linux-5.15.y report log
2025/09/19 17:33 14m retest repro linux-5.15.y report log
2025/06/30 22:21 14m retest repro linux-5.15.y report log
2025/04/11 11:07 46m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (10)
Created Duration User Patch Repo Result
2026/05/27 13:37 51m fix candidate upstream error job log
2026/03/28 19:16 15m fix candidate upstream error job log
2026/02/26 05:13 21m fix candidate upstream error job log
2026/01/25 15:00 10m fix candidate upstream error job log
2025/12/26 14:15 1m fix candidate upstream error job log
2025/10/15 09:31 1m fix candidate upstream error job log
2025/08/08 03:14 1m fix candidate upstream error job log
2025/05/31 14:55 1m fix candidate upstream error job log
2025/03/05 20:37 1m fix candidate upstream error job log
2025/01/28 06:04 1m bisect fix linux-5.15.y error job log

Sample crash report:
REISERFS error (device loop0): vs-13050 reiserfs_update_sd_size: i/o failure occurred trying to update [2 1 0x0 SD] stat data
REISERFS warning (device loop0): jdm-20006 create_privroot: xattrs/ACLs enabled and couldn't find/create .reiserfs_priv. Failing mount.
loop0: detected capacity change from 0 to 64
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 5629 at kernel/locking/mutex.c:575 __mutex_lock_common+0x193b/0x2400 kernel/locking/mutex.c:575
Modules linked in:
CPU: 0 PID: 5629 Comm: syz.0.549 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__mutex_lock_common+0x193b/0x2400 kernel/locking/mutex.c:575
Code: 00 00 83 3d ce b2 c7 03 00 4c 8d b4 24 e0 00 00 00 0f 85 02 e8 ff ff 48 c7 c7 e0 1a 2b 8a 48 c7 c6 20 1b 2b 8a e8 75 88 ec ff <0f> 0b e9 e8 e7 ff ff e8 a9 1b 3e f7 e9 41 fb ff ff 0f 0b e9 63 f1
RSP: 0018:ffffc900034775c0 EFLAGS: 00010246
RAX: 4c7971a4bc56c600 RBX: ffff88807abe3028 RCX: ffff88801fc59dc0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90003477750 R08: ffff8880b902795b R09: 1ffff11017204f2b
R10: dffffc0000000000 R11: ffffed1017204f2c R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc900034776a0 R15: 0000000000000000
FS:  000055558f257500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1ff8db3c00 CR3: 000000007a851000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 reiserfs_write_lock+0x75/0xd0 fs/reiserfs/lock.c:27
 reiserfs_lookup+0x187/0x480 fs/reiserfs/namei.c:364
 lookup_open fs/namei.c:3448 [inline]
 open_last_lookups fs/namei.c:3540 [inline]
 path_openat+0x1046/0x2fb0 fs/namei.c:3747
 do_filp_open+0x1df/0x400 fs/namei.c:3777
 do_sys_openat2+0x14b/0x500 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 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: 0033:0x7f2001b49e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd58b07578 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f2001dc2fa0 RCX: 00007f2001b49e59
RDX: 000000000000275a RSI: 00002000000001c0 RDI: ffffffffffffff9c
RBP: 00007f2001bdfe6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2001dc2fac R14: 00007f2001dc2fa0 R15: 00007f2001dc2fa0
 </TASK>

Crashes (23):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/21 06:50 linux-5.15.y eceeec79dbc6 43bfcdb0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2024/10/27 14:26 linux-5.15.y 74cdd62cb470 65e8686b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_lookup
2026/04/15 23:28 linux-5.15.y 91d48252ad4b df15c5f3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2026/02/23 10:19 linux-5.15.y 3330a8d33e08 6beca497 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2026/02/15 18:20 linux-5.15.y e45d5d41c134 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2025/09/04 02:18 linux-5.15.y 01879f56bdde d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2025/09/02 13:22 linux-5.15.y 01879f56bdde 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2025/07/31 16:07 linux-5.15.y c79648372d02 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2025/06/16 12:56 linux-5.15.y 1c700860e8bc d1716036 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2025/05/25 18:56 linux-5.15.y 98f47d0e9b8c 2d4582d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2025/02/28 14:22 linux-5.15.y c16c81c81336 67cf5345 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2024/10/21 01:26 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2024/09/08 23:59 linux-5.15.y 14e468424d3e 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2024/07/01 06:41 linux-5.15.y 4878aadf2d15 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2024/04/08 07:45 linux-5.15.y 9465fef4ae35 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2024/04/01 23:41 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in reiserfs_lookup
2025/07/28 14:13 linux-5.15.y c79648372d02 6654ea9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_lookup
2025/03/28 08:29 linux-5.15.y 0c935c049b5c 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_lookup
2025/02/28 14:18 linux-5.15.y c16c81c81336 67cf5345 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_lookup
2025/02/04 21:02 linux-5.15.y c16c81c81336 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_lookup
2025/01/28 12:11 linux-5.15.y 003148680b79 18070896 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_lookup
2024/10/03 02:27 linux-5.15.y 3a5928702e71 a4c7fd36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_lookup
2024/03/31 03:45 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in reiserfs_lookup
* Struck through repros no longer work on HEAD.