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: 1311d, last: 3h42m
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 1277d 1332d 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 415d 527d 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 7994 1h46m 1312d 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 1230d 1332d 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 1332d 1332d 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 2109 3h03m 447d 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 355d 384d 29/29 fixed on 2025/11/18 08:45
upstream VFS: Busy inodes after unmount (use-after-free) (4) prio:high fs 2 syz, C error 6416 18m 299d 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 532d 1364d 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 (4953):
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)
2026/10/20 12:43 linux-5.15.y 792fbe1537d8 df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/20 11:27 linux-5.15.y 792fbe1537d8 df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/20 06:55 linux-5.15.y 792fbe1537d8 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/19 22:59 linux-5.15.y 792fbe1537d8 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/19 22:47 linux-5.15.y 792fbe1537d8 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/19 18:00 linux-5.15.y 792fbe1537d8 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/19 15:56 linux-5.15.y 792fbe1537d8 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/19 15:10 linux-5.15.y 792fbe1537d8 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/19 13:04 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/19 11:57 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/19 11:05 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/19 09:32 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/18 19:57 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/18 00:03 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/17 02:42 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/17 01:12 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/17 00:22 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/17 00:19 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/16 16:00 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/16 14:20 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/16 12:54 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/16 12:54 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/16 11:49 linux-5.15.y 792fbe1537d8 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 23:10 linux-5.15.y 792fbe1537d8 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 23:09 linux-5.15.y 792fbe1537d8 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 22:08 linux-5.15.y 792fbe1537d8 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 20:48 linux-5.15.y 792fbe1537d8 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 20:45 linux-5.15.y 792fbe1537d8 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 16:57 linux-5.15.y 792fbe1537d8 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 14:35 linux-5.15.y 792fbe1537d8 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 13:52 linux-5.15.y 792fbe1537d8 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 07:23 linux-5.15.y a051a4bf909f 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 06:41 linux-5.15.y a051a4bf909f 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 04:30 linux-5.15.y a051a4bf909f 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 03:00 linux-5.15.y a051a4bf909f 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 01:47 linux-5.15.y a051a4bf909f 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/15 01:21 linux-5.15.y a051a4bf909f 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/14 14:31 linux-5.15.y a051a4bf909f 1a71827b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/14 13:18 linux-5.15.y a051a4bf909f 1a71827b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/14 13:18 linux-5.15.y a051a4bf909f 1a71827b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/14 12:06 linux-5.15.y a051a4bf909f 1a71827b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/10/14 12:06 linux-5.15.y a051a4bf909f 1a71827b .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.