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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: 1159d, last: now
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 C 4 1124d 1180d 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 C error 277 263d 375d 29/29 fixed on 2025/09/04 16:57
linux-6.1 VFS: Busy inodes after unmount (use-after-free) origin:lts-only 2 C inconclusive 2829 1h22m 1160d 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 C error done 2 1078d 1180d 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 C done inconclusive 1 1180d 1180d 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 C inconclusive 420 1h07m 295d 0/2 upstream: reported C repro on 2025/07/29 23:52
upstream VFS: Busy inodes after unmount (use-after-free) (3) fs 2 C error 85 203d 232d 29/29 fixed on 2025/11/18 08:45
upstream VFS: Busy inodes after unmount (use-after-free) (4) jfs 2 C error 27 25d 147d 0/29 upstream: reported C repro on 2025/12/25 14:06
upstream VFS: Busy inodes after unmount (use-after-free) fs 2 C error 55684 380d 1212d 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 OK log
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
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 (2887):
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)
2026/05/21 14:56 linux-5.15.y 93741761e5e3 e195359d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/21 02:44 linux-5.15.y 93741761e5e3 41b8c833 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/21 02:44 linux-5.15.y 93741761e5e3 41b8c833 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/20 14:18 linux-5.15.y 93741761e5e3 62fb93a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/20 02:26 linux-5.15.y 93741761e5e3 0909d65f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/19 13:50 linux-5.15.y 93741761e5e3 223544dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/19 01:02 linux-5.15.y 93741761e5e3 9f74d399 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/18 13:40 linux-5.15.y 93741761e5e3 55156e84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/18 04:23 linux-5.15.y 93741761e5e3 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/17 05:28 linux-5.15.y 93741761e5e3 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/17 00:37 linux-5.15.y 93741761e5e3 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 20:38 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 20:38 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 16:08 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 16:00 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 15:53 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 15:44 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 15:34 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 15:23 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 15:14 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 15:06 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/16 15:02 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/15 03:40 linux-5.15.y de8dfb3f0278 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/11 12:05 linux-5.15.y de8dfb3f0278 845acb1c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/10 10:49 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/10 04:40 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/09 09:30 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/09 09:30 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/09 00:56 linux-5.15.y 7e75ef31ddc9 b2988c17 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/07 16:46 linux-5.15.y ef251c45f1cd cbf9e0fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/07 11:34 linux-5.15.y ef251c45f1cd f250db59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/07 08:50 linux-5.15.y ef251c45f1cd f250db59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/07 05:49 linux-5.15.y ef251c45f1cd f250db59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/07 05:47 linux-5.15.y ef251c45f1cd f250db59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/05/03 06:30 linux-5.15.y ef251c45f1cd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/04/27 05:06 linux-5.15.y b9d57c40a767 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/04/26 11:43 linux-5.15.y b9d57c40a767 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/04/26 03:17 linux-5.15.y b9d57c40a767 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/04/20 04:59 linux-5.15.y b9d57c40a767 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/04/19 14:58 linux-5.15.y b9d57c40a767 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/04/16 14:30 linux-5.15.y 91d48252ad4b 4743f87d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/04/16 14:24 linux-5.15.y 91d48252ad4b 4743f87d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2026/04/16 02:50 linux-5.15.y 91d48252ad4b df15c5f3 .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.