syzbot


WARNING in do_rmdir

Status: moderation: reported on 2025/04/21 00:40
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+5137233e6c55b3fe89dd@syzkaller.appspotmail.com
First crash: 107d, last: 21d

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888052cad4e8, owner = 0x0, curr 0xffff888033b6c880, list empty
WARNING: CPU: 0 PID: 5350 at kernel/locking/rwsem.c:1368 __up_write kernel/locking/rwsem.c:1367 [inline]
WARNING: CPU: 0 PID: 5350 at kernel/locking/rwsem.c:1368 up_write+0x3a2/0x420 kernel/locking/rwsem.c:1630
Modules linked in:
CPU: 0 UID: 0 PID: 5350 Comm: syz.0.0 Not tainted 6.16.0-rc5-syzkaller-00224-g379f604cc3dc #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__up_write kernel/locking/rwsem.c:1367 [inline]
RIP: 0010:up_write+0x3a2/0x420 kernel/locking/rwsem.c:1630
Code: d0 48 c7 c7 80 f9 8a 8b 48 c7 c6 a0 fb 8a 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 08 41 52 e8 53 3e e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6d fd ff ff 48 c7 c1 34 27 a2 8f 80 e1 07 80 c1 03
RSP: 0018:ffffc9000f407db0 EFLAGS: 00010292
RAX: f38ede2f4d249200 RBX: ffff888052cad4e8 RCX: ffff888033b6c880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfaa64 R12: 0000000000000000
R13: ffff888052cad540 R14: ffff888052cad4e8 R15: 1ffff1100a595a9e
FS:  00007efcc3dca6c0(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd1b737f40 CR3: 000000003f65c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:879 [inline]
 do_rmdir+0x2ec/0x630 fs/namei.c:4529
 __do_sys_rmdir fs/namei.c:4544 [inline]
 __se_sys_rmdir fs/namei.c:4542 [inline]
 __x64_sys_rmdir+0x47/0x50 fs/namei.c:4542
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efcc2f8e929
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:00007efcc3dca038 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00007efcc31b6160 RCX: 00007efcc2f8e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00007efcc3010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007efcc31b6160 R15: 00007ffd1b738718
 </TASK>

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/12 10:59 upstream 379f604cc3dc 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_rmdir
2025/05/07 10:29 upstream 0d8d44db295c 350f4ffc .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_rmdir
2025/04/17 00:29 upstream c62f4b82d571 a95239b1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_rmdir
2025/06/03 09:03 linux-next a0bea9e39035 b396b4bf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in do_rmdir
2025/06/03 09:03 linux-next a0bea9e39035 b396b4bf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in do_rmdir
* Struck through repros no longer work on HEAD.