> Found that commit 990e78116d38059c ("block: loop: fix deadlock between open and remove") went to 5.13-rc6.
>
> #syz fix: block: loop: fix deadlock between open and remove
Your 'fix:' command is accepted, but please keep syzkaller-bugs@xxxxxxxxxxxxxxxx mailing list in CC next time. It serves as a history of what happened with each bug report. Thank you.
>
> Now syzbot is reporting
>
> Possible unsafe locking scenario:
>
> CPU0 CPU1
> ---- ----
> lock(nbd_index_mutex);
> lock(&bdev->bd_mutex);
> lock(nbd_index_mutex);
> lock(&bdev->bd_mutex);
>
> at https://syzkaller.appspot.com/text?tag=CrashReport&x=11b8a5bbd00000 .
>
