WARNING: lock held when returning to user space!

Status: upstream: reported C repro on 2022/10/15 19:00
Reported-by: syzbot+c0402e6c7700835c76d5@syzkaller.appspotmail.com
First crash: 1397d, last: 1261d
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING: lock held when returning to user space! (2) net 4 syz, C 9 3016d 3017d 8/29 fixed on 2018/07/09 18:05
upstream WARNING: lock held when returning to user space! (3) 4 syz, C 2 2782d 2779d 0/29 closed as dup on 2019/01/02 11:24
upstream WARNING: lock held when returning to user space! block 4 syz, C 40 3035d 3050d 5/29 fixed on 2018/05/08 18:30
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2023/02/28 07:08 26m bisect fix linux-4.14.y OK (0) job log log
2023/01/26 20:16 24m bisect fix linux-4.14.y OK (0) job log log
2022/11/17 21:08 23m bisect fix linux-4.14.y OK (0) job log log

Sample crash report:
F2FS-fs (loop0): Invalid blocksize (65536), supports only 4KB
F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop0): Found nat_bits in checkpoint
F2FS-fs (loop0): Mounted with checkpoint version = 3e17dab1
================================================
WARNING: lock held when returning to user space!
4.14.295-syzkaller #0 Not tainted
------------------------------------------------
syz-executor166/7993 is leaving the kernel with locks still held!
1 lock held by s

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/18 21:03 linux-4.14.y 9d5c0b3a8e1a b31320fc .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-14 WARNING: lock held when returning to user space!
2022/10/15 19:00 linux-4.14.y 9d5c0b3a8e1a 67cb024c .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-14 WARNING: lock held when returning to user space!
* Struck through repros no longer work on HEAD.