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WARNING: lock held when returning to user space in lo_ioctl

Status: upstream: reported C repro on 2022/09/10 09:41
Reported-by: syzbot+c1d8ca717a93d3a2e7b4@syzkaller.appspotmail.com
First crash: 838d, last: 662d

Sample crash report:
================================================
WARNING: lock held when returning to user space!
4.14.307-syzkaller #0 Not tainted
------------------------------------------------
syz-executor196/7976 is leaving the kernel with locks still held!
1 lock held by syz-executor196/7976:
 #0:  (&lo->lo_ctl_mutex/1){+.+.}, at: [<ffffffff838df0d7>] lo_ioctl+0x87/0x1cd0 drivers/block/loop.c:1419

Crashes (31):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/05 16:47 linux-4.14.y 7878a41b6cc1 f8902b57 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2023/02/26 20:08 linux-4.14.y 7878a41b6cc1 ee50e71c .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2023/02/26 18:24 linux-4.14.y 7878a41b6cc1 ee50e71c .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2023/01/27 20:54 linux-4.14.y 3949d1610004 9dfcf09c .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/09/15 20:54 linux-4.14.y 5df8b4735177 dd9a85ff .config console log report syz C [disk image] [vmlinux] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2023/03/04 22:23 linux-4.14.y 7878a41b6cc1 f8902b57 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2023/03/04 17:23 linux-4.14.y 7878a41b6cc1 f8902b57 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2023/03/03 06:36 linux-4.14.y 7878a41b6cc1 f8902b57 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2023/02/12 10:45 linux-4.14.y a8ad60f2af58 93e26d60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2023/02/04 22:25 linux-4.14.y 3949d1610004 be607b78 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2023/01/31 21:06 linux-4.14.y 3949d1610004 b68fb8d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/12/12 01:52 linux-4.14.y 65afe34ac33d 67be1ae7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/12/11 10:59 linux-4.14.y 65afe34ac33d 67be1ae7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/12/06 08:18 linux-4.14.y 179ef7fe8677 045cbb84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/12/03 14:10 linux-4.14.y 179ef7fe8677 e080de16 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/12/02 13:07 linux-4.14.y 179ef7fe8677 e080de16 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/11/19 14:52 linux-4.14.y e911713e40ca 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/11/17 03:44 linux-4.14.y e911713e40ca 3a127a31 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/11/08 19:55 linux-4.14.y a901bb6c7db7 060f945e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/11/06 11:45 linux-4.14.y a901bb6c7db7 6d752409 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/11/05 08:10 linux-4.14.y a901bb6c7db7 6d752409 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/10/30 09:16 linux-4.14.y 41f36d7859a7 2a71366b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/10/20 02:18 linux-4.14.y 9d5c0b3a8e1a b31320fc .config console log report info [disk image] [vmlinux] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/10/18 02:59 linux-4.14.y 9d5c0b3a8e1a 94744d21 .config console log report info [disk image] [vmlinux] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/10/07 06:36 linux-4.14.y 9d5c0b3a8e1a 80b58a42 .config console log report info [disk image] [vmlinux] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/09/28 02:31 linux-4.14.y 4edbf74132a4 75c78242 .config console log report info [disk image] [vmlinux] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/09/22 03:54 linux-4.14.y 4edbf74132a4 60af5050 .config console log report info [disk image] [vmlinux] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/09/16 17:41 linux-4.14.y 5df8b4735177 dd9a85ff .config console log report info [disk image] [vmlinux] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/09/15 17:24 linux-4.14.y 5df8b4735177 dd9a85ff .config console log report info [disk image] [vmlinux] ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/09/11 18:53 linux-4.14.y 65640c873dcf 356d8217 .config console log report info ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
2022/09/10 09:41 linux-4.14.y 65640c873dcf 356d8217 .config console log report info ci2-linux-4-14 WARNING: lock held when returning to user space in lo_ioctl
* Struck through repros no longer work on HEAD.