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

Status: upstream: reported C repro on 2023/03/19 11:46
Bug presence: origin:lts-only
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+d5fb8af502fef70f9aa1@syzkaller.appspotmail.com
First crash: 1243d, last: 3h19m
Fix commit to backport (bisect log) :
tree: upstream
commit d0118d7d20bbf9a76f75840bc3b0da0f4d092da9
Author: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Mon Jun 30 10:21:31 2025 +0000

  ocfs2: update d_splice_alias() return code checking

  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/05/08 linux-5.15.y (ToT) ef251c45f1cd C [report] VFS: Busy inodes after unmount (use-after-free)
2026/05/08 upstream (ToT) 917719c412c4 C Didn't crash
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-54 VFS: Busy inodes after unmount (use-after-free) 2 syz, C 4 1209d 1265d 0/2 auto-obsoleted due to no activity on 2023/08/20 15:35
upstream VFS: Busy inodes after unmount (use-after-free) (2) btrfs 2 syz, C error 277 347d 459d 29/29 fixed on 2025/09/04 16:57
linux-6.1 VFS: Busy inodes after unmount (use-after-free) origin:lts-only 2 syz, C inconclusive 4371 1h07m 1244d 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 2 syz, C error done 2 1163d 1265d 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) 2 syz, C done inconclusive 1 1265d 1265d 0/2 auto-obsoleted due to no activity on 2023/06/25 23:02
linux-6.6 VFS: Busy inodes after unmount (use-after-free) origin:upstream missing-backport 2 syz, C inconclusive 1013 1d18h 380d 0/2 upstream: reported C repro on 2025/07/29 23:52
upstream VFS: Busy inodes after unmount (use-after-free) (3) fs 2 syz, C error 85 287d 317d 29/29 fixed on 2025/11/18 08:45
upstream VFS: Busy inodes after unmount (use-after-free) (4) prio:high jfs 2 syz, C error 56 8h01m 231d 0/29 upstream: reported C repro on 2025/12/25 14:06
upstream VFS: Busy inodes after unmount (use-after-free) fs 2 syz, C error 55684 465d 1296d 28/29 fixed on 2025/05/06 15:33
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2026/03/05 11:43 1h56m retest repro linux-5.15.y report log
2026/03/05 11:43 1h49m retest repro linux-5.15.y report log
2025/11/11 12:42 13m retest repro linux-5.15.y report log
2025/11/11 12:42 16m retest repro linux-5.15.y report log
2025/11/11 12:05 16m retest repro linux-5.15.y no crash log
▶ ▼ Fix bisection attempts (6)
Created Duration User Patch Repo Result
2026/06/14 00:34 7h27m fix candidate upstream OK (1) job log
2026/03/27 01:12 13m fix candidate upstream error job log
2026/02/24 16:15 1m fix candidate upstream error job log
2026/01/24 05:05 1m fix candidate upstream error job log
2024/02/02 08:13 7h06m fix candidate upstream OK (1) job log
2024/01/24 11:12 0m bisect fix linux-5.15.y error job log

Sample crash report:
ocfs2: Unmounting device (7,0) on (node local)
VFS: Busy inodes after unmount of loop0. Self-destruct in 5 seconds.  Have a nice day...

Crashes (3406):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/03 08:26 linux-5.15.y ef251c45f1cd a0d91488 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/06/23 05:23 linux-5.15.y 1c700860e8bc d6cdfb8a .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/02/25 15:57 linux-5.15.y c16c81c81336 d34966d1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2026/08/13 21:08 linux-5.15.y aabd761612db b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/12 21:24 linux-5.15.y aabd761612db 359b2492 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/12 21:22 linux-5.15.y aabd761612db 359b2492 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/12 04:33 linux-5.15.y aabd761612db f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/11 16:25 linux-5.15.y aabd761612db 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/10 21:50 linux-5.15.y aabd761612db 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/10 08:01 linux-5.15.y aabd761612db 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/09 06:17 linux-5.15.y aabd761612db 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/08 06:15 linux-5.15.y aabd761612db 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/08 06:15 linux-5.15.y aabd761612db 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/07 17:39 linux-5.15.y aabd761612db e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/07 12:36 linux-5.15.y aabd761612db e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/06 20:23 linux-5.15.y 9c7634c60784 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/06 17:08 linux-5.15.y 6e2fd6534337 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/05 21:48 linux-5.15.y 6e2fd6534337 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/05 21:48 linux-5.15.y 6e2fd6534337 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/05 05:14 linux-5.15.y 6e2fd6534337 52aa2820 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/04 15:44 linux-5.15.y 6e2fd6534337 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/04 01:20 linux-5.15.y 6e2fd6534337 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/03 13:29 linux-5.15.y 6e2fd6534337 6b7c9f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/02 17:50 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/02 03:57 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/01 23:25 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/08/01 04:39 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/31 15:30 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/31 15:27 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/30 20:28 linux-5.15.y 6e2fd6534337 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/30 14:45 linux-5.15.y 6e2fd6534337 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/30 09:51 linux-5.15.y 674f684f7c61 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/29 17:38 linux-5.15.y 674f684f7c61 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/29 04:23 linux-5.15.y 674f684f7c61 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/29 04:23 linux-5.15.y 674f684f7c61 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/28 16:36 linux-5.15.y 674f684f7c61 edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/28 03:21 linux-5.15.y 674f684f7c61 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/27 14:40 linux-5.15.y 674f684f7c61 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/27 06:06 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/26 07:14 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/21 07:33 linux-5.15.y c86c4726e7f0 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/15 03:51 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/13 00:57 linux-5.15.y c86c4726e7f0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/08 07:36 linux-5.15.y c86c4726e7f0 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/07 20:07 linux-5.15.y c86c4726e7f0 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/07/07 15:43 linux-5.15.y c86c4726e7f0 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/10/12 13:12 linux-5.15.y 29e53a5b1c4f ff1712fe .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2023/08/13 16:37 linux-5.15.y 24c4de4069cb 39990d51 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2023/06/27 09:43 linux-5.15.y f67653019430 4cd5bb25 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2023/03/19 22:42 linux-5.15.y 8020ae3c051d 7939252e .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/07/27 22:11 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2024/11/12 10:41 linux-5.15.y 3c17fc483905 75bb1b32 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2024/08/03 15:20 linux-5.15.y 7e89efd3ae1c 1786a2a8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2023/07/30 04:16 linux-5.15.y 09996673e313 92476829 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2023/03/19 11:46 linux-5.15.y 8020ae3c051d 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
* Struck through repros no longer work on HEAD.