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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:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+d5fb8af502fef70f9aa1@syzkaller.appspotmail.com
First crash: 846d, last: 15h17m
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2025/03/12 upstream (ToT) 0fed89a961ea C [report] VFS: Busy inodes after unmount (use-after-free)
▶ ▼ Similar bugs (6)
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 812d 868d 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 187 2h39m 63d 2/29 upstream: reported C repro on 2025/05/11 08:46
linux-6.1 VFS: Busy inodes after unmount (use-after-free) origin:lts-only 2 C inconclusive 1650 8d21h 848d 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 766d 868d 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 868d 868d 0/2 auto-obsoleted due to no activity on 2023/06/25 23:02
upstream VFS: Busy inodes after unmount (use-after-free) bcachefs 2 C error 55684 68d 899d 28/29 fixed on 2025/05/06 15:33
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2025/05/30 01:11 12m retest repro linux-5.15.y report log
2025/03/19 11:47 24m retest repro linux-5.15.y OK log
2025/03/19 11:47 15m retest repro linux-5.15.y report log
2025/03/19 11:47 23m retest repro linux-5.15.y OK log
2025/02/24 05:25 17m retest repro linux-5.15.y OK log
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
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:
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. Self-destruct in 5 seconds.  Have a nice day...

Crashes (2331):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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)
2025/05/12 05:57 linux-5.15.y 3b8db0e4f263 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/04/16 16:57 linux-5.15.y f7347f400572 a95239b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/03/23 00:59 linux-5.15.y 0c935c049b5c c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/03/23 00:47 linux-5.15.y 0c935c049b5c c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/02/10 05:01 linux-5.15.y c16c81c81336 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/29 03:26 linux-5.15.y 003148680b79 865ef71e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/27 02:33 linux-5.15.y 003148680b79 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/27 00:40 linux-5.15.y 003148680b79 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/26 04:23 linux-5.15.y 003148680b79 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/20 03:32 linux-5.15.y 4735586da88e f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/17 14:36 linux-5.15.y 4735586da88e 953d1c45 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/16 17:10 linux-5.15.y 4735586da88e f9e07a6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/15 09:30 linux-5.15.y 4735586da88e 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/15 05:10 linux-5.15.y 4735586da88e 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/14 17:53 linux-5.15.y 4735586da88e f310a27d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/14 15:37 linux-5.15.y 4735586da88e f310a27d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/14 01:28 linux-5.15.y 4735586da88e b1f1cd88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/13 11:30 linux-5.15.y 4735586da88e 249ceea9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/13 09:27 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/13 03:55 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/10 22:12 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/10 19:21 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/10 03:54 linux-5.15.y 4735586da88e 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/09 14:13 linux-5.15.y 4735586da88e 9220929f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/09 10:54 linux-5.15.y 91786f140358 9220929f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/09 01:04 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan VFS: Busy inodes after unmount (use-after-free)
2025/01/08 12:54 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] 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)
2025/07/12 18:38 linux-5.15.y 2f693b607545 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/30 08:13 linux-5.15.y 3dea0e7f549e fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/25 17:14 linux-5.15.y 1c700860e8bc 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/23 17:06 linux-5.15.y 1c700860e8bc d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/06/23 03:02 linux-5.15.y 1c700860e8bc d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/05/15 11:43 linux-5.15.y 3b8db0e4f263 d6b2ee52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/03/05 02:05 linux-5.15.y c16c81c81336 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/03/03 06:06 linux-5.15.y c16c81c81336 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/02/25 14:45 linux-5.15.y c16c81c81336 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/01/09 20:35 linux-5.15.y 4735586da88e 9220929f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/01/09 18:45 linux-5.15.y 4735586da88e 9220929f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/01/09 09:04 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/01/09 05:01 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/01/09 02:06 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/01/08 20:23 linux-5.15.y 91786f140358 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 VFS: Busy inodes after unmount (use-after-free)
2025/01/08 10:59 linux-5.15.y 91786f140358 f3558dbf .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.