syzbot


WARNING in reiserfs_lookup

Status: upstream: reported on 2025/09/25 10:32
Reported-by: syzbot+58f6935ad913305afffd@syzkaller.appspotmail.com
First crash: 201d, last: 3d17h
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 996d 1037d 0/3 auto-obsoleted due to no activity on 2023/10/31 18:44
linux-6.1 WARNING in reiserfs_lookup -1 6 731d 900d 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 819d 1328d 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 21 50d 745d 0/3 upstream: reported C repro on 2024/03/31 03:45
linux-6.1 WARNING in reiserfs_lookup (2) -1 14 13d 336d 0/3 upstream: reported on 2025/05/13 14:33

Sample crash report:
loop2: detected capacity change from 0 to 1024
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 1 PID: 24874 at kernel/locking/mutex.c:582 __mutex_lock_common kernel/locking/mutex.c:582 [inline]
WARNING: CPU: 1 PID: 24874 at kernel/locking/mutex.c:582 __mutex_lock+0xb85/0xcc0 kernel/locking/mutex.c:747
Modules linked in:
CPU: 1 PID: 24874 Comm: syz.2.8402 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:582 [inline]
RIP: 0010:__mutex_lock+0xb85/0xcc0 kernel/locking/mutex.c:747
Code: 04 08 84 c0 0f 85 27 01 00 00 83 3d 34 44 fc 03 00 0f 85 95 f5 ff ff 48 c7 c7 80 b4 ca 8a 48 c7 c6 20 b5 ca 8a e8 eb d2 c1 f6 <0f> 0b e9 7b f5 ff ff 0f 0b e9 5f f9 ff ff 0f 0b e9 18 f6 ff ff e8
RSP: 0018:ffffc9000c7379a0 EFLAGS: 00010246
RAX: 096a0f0da7548500 RBX: ffff88807b25a028 RCX: 0000000000080000
RDX: ffffc9000d69b000 RSI: 000000000000456b RDI: 000000000000456c
RBP: ffffc9000c737b00 R08: ffff8880b8f28c13 R09: 1ffff110171e5182
R10: dffffc0000000000 R11: ffffed10171e5183 R12: 0000000000000000
R13: 1ffff920018e6f44 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f975b1146c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f56959d2000 CR3: 000000007aaa7000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 reiserfs_write_lock+0x79/0xd0 fs/reiserfs/lock.c:27
 reiserfs_lookup+0x183/0x580 fs/reiserfs/namei.c:364
 lookup_one_qstr_excl+0x112/0x250 fs/namei.c:1617
 filename_create+0x23e/0x480 fs/namei.c:3891
 do_mkdirat+0xa9/0x450 fs/namei.c:4136
 __do_sys_mkdirat fs/namei.c:4159 [inline]
 __se_sys_mkdirat fs/namei.c:4157 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4157
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f975a19b687
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 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:00007f975b113e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f975b113ee0 RCX: 00007f975a19b687
RDX: 00000000000001ff RSI: 00002000000002c0 RDI: 00000000ffffff9c
RBP: 00002000000001c0 R08: 0000200000000c40 R09: 0000000000000000
R10: 00002000000001c0 R11: 0000000000000246 R12: 00002000000002c0
R13: 00007f975b113ea0 R14: 0000000000000000 R15: 0000200000000400
 </TASK>

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/11 13:43 linux-6.6.y 8cee53b8eaeb 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in reiserfs_lookup
2026/03/12 10:49 linux-6.6.y 4fc00fe35d46 4efadf07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in reiserfs_lookup
2026/01/28 11:15 linux-6.6.y cbb31f77b879 004c195c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in reiserfs_lookup
2025/11/20 10:28 linux-6.6.y 0a805b6ea8cd 2cc4c24a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in reiserfs_lookup
2025/11/20 10:27 linux-6.6.y 0a805b6ea8cd 2cc4c24a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in reiserfs_lookup
2025/10/01 11:01 linux-6.6.y 147338df3487 a1859138 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in reiserfs_lookup
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.