syzbot


WARNING in cleanup_mnt (5)

Status: moderation: reported on 2025/03/01 10:11
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+1699d279652e5deef9ea@syzkaller.appspotmail.com
First crash: 60d, last: 26d
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in cleanup_mnt (3) fs 17 278d 341d 0/28 auto-obsoleted due to no activity on 2024/09/18 11:06
upstream WARNING in cleanup_mnt (2) fs 1 1656d 1655d 0/28 auto-closed as invalid on 2021/02/09 13:15
upstream WARNING in cleanup_mnt fs 6 2151d 2255d 0/28 auto-closed as invalid on 2019/10/25 08:43
upstream WARNING in cleanup_mnt (4) fs 5 99d 148d 0/28 closed as invalid on 2025/02/23 16:31
linux-4.19 WARNING in cleanup_mnt 1 1100d 1100d 0/1 auto-closed as invalid on 2022/08/19 13:11

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5834 at fs/namespace.c:1426 cleanup_mnt+0x486/0x4c0 fs/namespace.c:1426
Modules linked in:
CPU: 1 UID: 0 PID: 5834 Comm: syz-executor Not tainted 6.14.0-syzkaller-10514-g7f2ff7b62617 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:cleanup_mnt+0x486/0x4c0 fs/namespace.c:1426
Code: 48 c7 c6 a0 6e 45 82 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 8a 4a 63 ff e8 a5 ec 7d ff e9 c5 fc ff ff e8 9b ec 7d ff 90 <0f> 0b 90 e9 d4 fc ff ff e8 8d ec 7d ff 48 89 ef e8 f5 77 06 00 e9
RSP: 0018:ffffc90004167da8 EFLAGS: 00010293
RAX: ffffffff82456db5 RBX: 0000000000000002 RCX: ffff888062d81e00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff888033f78c40 R08: ffffffff82456a7f R09: 1ffffffff20bbfce
R10: dffffc0000000000 R11: ffffffff82456900 R12: 0000000000000002
R13: 1ffff110067ef193 R14: 0000607edac841dc R15: ffff888033f78c98
FS:  0000555580113500(0000) GS:ffff8881250ed000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc7351ffee0 CR3: 0000000065270000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 task_work_run+0x251/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fac3258e497
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff39b6faa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fac3260e08c RCX: 00007fac3258e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff39b6fb60
RBP: 00007fff39b6fb60 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff39b70bf0
R13: 00007fac3260e08c R14: 00000000000167d9 R15: 00007fff39b70c30
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/30 20:24 upstream 7f2ff7b62617 d3999433 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in cleanup_mnt
2025/03/02 00:10 upstream 03d38806a902 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in cleanup_mnt
2025/03/22 10:16 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in cleanup_mnt
2025/02/25 10:00 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a1c24ab82279 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in cleanup_mnt
* Struck through repros no longer work on HEAD.