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VFS: Busy inodes after unmount (use-after-free) (2)

Status: upstream: reported C repro on 2025/05/11 08:46
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+1134d3a5b062e9665a7a@syzkaller.appspotmail.com
First crash: 50d, last: 3h11m
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] ocfs2: update d_splice_alias() return code checking 2 (2) 2025/06/26 03:34
[syzbot] [btrfs?] VFS: Busy inodes after unmount (use-after-free) (2) 0 (1) 2025/05/11 08:46
▶ ▼ Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-54 VFS: Busy inodes after unmount (use-after-free) C 4 795d 851d 0/2 auto-obsoleted due to no activity on 2023/08/20 15:35
linux-6.1 VFS: Busy inodes after unmount (use-after-free) origin:lts-only C inconclusive 1649 4h26m 830d 0/3 upstream: reported C repro on 2023/03/18 09:53
android-5-15 VFS: Busy inodes after unmount (use-after-free) origin:downstream C error done 2 749d 851d 0/2 auto-obsoleted due to no activity on 2023/09/15 20:27
android-5-10 VFS: Busy inodes after unmount (use-after-free) C done inconclusive 1 851d 851d 0/2 auto-obsoleted due to no activity on 2023/06/25 23:02
upstream VFS: Busy inodes after unmount (use-after-free) bcachefs C error 55684 51d 882d 28/29 fixed on 2025/05/06 15:33
linux-5.15 VFS: Busy inodes after unmount (use-after-free) missing-backport origin:upstream C unreliable 2328 16h05m 829d 0/3 upstream: reported C repro on 2023/03/19 11:46

Sample crash report:
VFS: Lookup of '.' in ocfs2 loop0 would have caused loop
VFS: Lookup of '.' in ocfs2 loop0 would have caused loop
ocfs2: Unmounting device (7,0) on (node local)
VFS: Busy inodes after unmount of loop0 (ocfs2)
------------[ cut here ]------------
kernel BUG at fs/super.c:653!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5825 Comm: syz-executor776 Not tainted 6.16.0-rc3-syzkaller-00057-g92ca6c498a5e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:generic_shutdown_super+0x2bc/0x2c0 fs/super.c:651
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 5e f2 ee ff 49 8b 16 48 81 c3 70 06 00 00 48 c7 c7 00 1c 99 8b 48 89 de e8 55 d8 f4 fe 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f
RSP: 0018:ffffc9000432fb80 EFLAGS: 00010246
RAX: 000000000000002f RBX: ffff88807ae48670 RCX: 783a4995bbf4b700
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff1100f5c90f1 R08: ffff8880b8624293 R09: 1ffff110170c4852
R10: dffffc0000000000 R11: ffffed10170c4853 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8e676cc0 R15: ffff88807ae48788
FS:  0000000000000000(0000) GS:ffff888125c83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556eb58738 CR3: 00000000353da000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kill_block_super+0x44/0x90 fs/super.c:1755
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x22e0 kernel/exit.c:964
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
 __do_sys_exit_group kernel/exit.c:1116 [inline]
 __se_sys_exit_group kernel/exit.c:1114 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1114
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f5362e527c9
Code: Unable to access opcode bytes at 0x7f5362e5279f.
RSP: 002b:00007ffe3001b448 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f5362e527c9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f5362ed3390 R08: ffffffffffffffb8 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 00007f5362ed3390
R13: 0000000000000000 R14: 00007f5362ed4100 R15: 00007f5362e20780
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:generic_shutdown_super+0x2bc/0x2c0 fs/super.c:651
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 5e f2 ee ff 49 8b 16 48 81 c3 70 06 00 00 48 c7 c7 00 1c 99 8b 48 89 de e8 55 d8 f4 fe 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f
RSP: 0018:ffffc9000432fb80 EFLAGS: 00010246
RAX: 000000000000002f RBX: ffff88807ae48670 RCX: 783a4995bbf4b700
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff1100f5c90f1 R08: ffff8880b8624293 R09: 1ffff110170c4852
R10: dffffc0000000000 R11: ffffed10170c4853 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8e676cc0 R15: ffff88807ae48788
FS:  0000000000000000(0000) GS:ffff888125c83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556eb58738 CR3: 0000000027ace000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (175):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/26 06:07 upstream 92ca6c498a5e 26d77996 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-upstream-fs VFS: Busy inodes after unmount (use-after-free)
2025/06/23 09:04 upstream b67ec639010f d6cdfb8a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-upstream-fs VFS: Busy inodes after unmount (use-after-free)
2025/05/07 10:25 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e0f4c8dd9d2d 350f4ffc .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/05/07 10:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e0f4c8dd9d2d 350f4ffc .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/05/07 09:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e0f4c8dd9d2d 350f4ffc .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/09 21:02 linux-next 475c850a7fdd 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root VFS: Busy inodes after unmount (use-after-free)
2025/06/25 23:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/25 16:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/23 11:17 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/22 07:10 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 9aa9b43d689e d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/20 01:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/19 13:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/17 22:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/17 18:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/16 02:30 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/15 16:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/15 09:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/15 05:02 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/14 17:05 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/14 13:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 0e8da31f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/14 08:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 0e8da31f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/14 04:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 0e8da31f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/14 01:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 39dfc971e42d 0e8da31f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/13 16:24 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/13 10:36 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/13 09:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/13 03:01 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/12 16:54 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/12 15:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/12 10:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/12 07:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/12 03:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/12 03:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/11 15:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 19272b37aa4f 5d7e17ca .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/11 07:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 5d7e17ca .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/10 23:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 5d7e17ca .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/10 18:05 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 5d7e17ca .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/10 14:59 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 5d7e17ca .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/10 05:16 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/10 04:09 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/10 00:14 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/09 11:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/09 07:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/09 03:43 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/09 02:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/08 22:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/08 21:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/08 19:49 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/08 19:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/08 19:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/08 19:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d7fa1af5b33e 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 VFS: Busy inodes after unmount (use-after-free)
* Struck through repros no longer work on HEAD.