syzbot


WARNING in lookup_slow (2)

Status: moderation: reported on 2024/05/13 10:15
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+cf57630b8fb07c398c35@syzkaller.appspotmail.com
First crash: 36d, last: 11h15m
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in lookup_slow (2) 1 226d 226d 0/3 auto-obsoleted due to no activity on 2024/02/09 08:58
linux-6.1 WARNING in lookup_slow origin:upstream missing-backport C inconclusive 5 14d 194d 0/3 upstream: reported C repro on 2023/12/02 22:03
linux-5.15 WARNING in lookup_slow (3) origin:lts-only C error 4 8d06h 76d 0/3 upstream: reported C repro on 2024/03/30 12:27
upstream WARNING in lookup_slow ntfs3 C error inconclusive 34 142d 543d 0/27 auto-obsoleted due to no activity on 2024/05/02 19:30
linux-5.15 WARNING in lookup_slow 1 385d 385d 0/3 auto-obsoleted due to no activity on 2023/09/02 18:27

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem)): count = 0x0, magic = 0xffff88805e7fa930, owner = 0x0, curr 0xffff888029c43c00, list empty
WARNING: CPU: 1 PID: 13600 at kernel/locking/rwsem.c:1343 __up_read+0x617/0x6b0 kernel/locking/rwsem.c:1343
Modules linked in:
CPU: 1 PID: 13600 Comm: syz-executor.4 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:__up_read+0x617/0x6b0 kernel/locking/rwsem.c:1343
Code: 8b 48 0f 44 c1 48 c7 c7 c0 ae ca 8b 48 c7 c6 60 af ca 8b 4c 89 fa 4c 89 f1 49 89 d8 4d 89 e9 50 e8 1e ac e6 ff 48 83 c4 08 90 <0f> 0b 90 90 48 bb 00 00 00 00 00 fc ff df 4c 8b 2c 24 e9 37 fb ff
RSP: 0018:ffffc900047d7a00 EFLAGS: 00010296
RAX: be24ee291b792700 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90012d5f000 RSI: 000000000000c3fb RDI: 000000000000c3fc
RBP: ffffc900047d7ab8 R08: ffffffff81585742 R09: fffffbfff1c39994
R10: dffffc0000000000 R11: fffffbfff1c39994 R12: ffff88805e7fa988
R13: ffff888029c43c00 R14: ffff88805e7fa930 R15: 0000000000000000
FS:  00007fc3ee3426c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31539000 CR3: 00000000653ac000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock_shared include/linux/fs.h:806 [inline]
 lookup_slow+0x5e/0x70 fs/namei.c:1710
 walk_component+0x2e1/0x410 fs/namei.c:2004
 lookup_last fs/namei.c:2469 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2493
 filename_lookup+0x256/0x610 fs/namei.c:2522
 do_linkat+0x13f/0x6f0 fs/namei.c:4663
 __do_sys_link fs/namei.c:4717 [inline]
 __se_sys_link fs/namei.c:4715 [inline]
 __x64_sys_link+0x86/0xa0 fs/namei.c:4715
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc3ed67cea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc3ee3420c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007fc3ed7b41f0 RCX: 00007fc3ed67cea9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000020000340
RBP: 00007fc3ed6ebff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fc3ed7b41f0 R15: 00007ffd2f267218
 </TASK>

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/14 01:15 upstream 2ccbdf43d5e7 a9616ff5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in lookup_slow
2024/06/01 12:25 upstream cc8ed4d0a848 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in lookup_slow
2024/05/21 15:23 upstream 8f6a15f095a6 4c0d3ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in lookup_slow
2024/05/13 08:44 upstream ba16c1cf11c9 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in lookup_slow
2024/05/10 23:11 upstream f4345f05c0df f7c35481 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in lookup_slow
2024/06/12 01:03 linux-next a957267fa7e9 c7d7d815 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in lookup_slow
2024/06/04 06:47 linux-next d97496ca23a2 a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in lookup_slow
2024/05/09 10:10 linux-next 704ba27ac555 20bf80e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in lookup_slow
* Struck through repros no longer work on HEAD.