Hello.

syzbot is reporting "possible deadlock in del_gendisk" problem.

I guess this is caused by commit 6cc8e7430801fa23 ("loop: scale loop device
by introducing per device lock") because it touches loop_ctl_mutex usage
between v5.11 and v5.12-rc1. Please have a look.

On 2021/04/14 2:33, syzbot wrote:

Hello,

syzbot found the following issue on:

HEAD commit:    e99d8a84 Add linux-next specific files for 20210409
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13b01681d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7cd69574979bfeb7
dashboard link: https://syzkaller.appspot.com/bug?extid=61e04e51b7ac86930589
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=148265d9d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16a981a1d00000