syzbot suspects this issue was fixed by commit:
commit 08fc1ab6d748ab1a690fd483f41e2938984ce353
Author: Christoph Hellwig <hch@xxxxxx>
Date: Tue Sep 1 09:59:41 2020 +0000
block: fix locking in bdev_del_partition
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1259b1e7900000
start commit: f75aef39 Linux 5.9-rc3
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=3c5f6ce8d5b68299
dashboard link: https://syzkaller.appspot.com/bug?extid=b8639c8dcb5ec4483d4f
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15c43c79900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=173dfa1e900000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: block: fix locking in bdev_del_partition
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
