syzbot has bisected this issue to:
commit 2b9ac22b12a266eb4fec246a07b504dd4983b16b
Author: Kristian Klausen <kristian@xxxxxxxxxx>
Date: Fri Jun 18 11:51:57 2021 +0000
loop: Fix missing discard support when using LOOP_CONFIGURE
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15dfb0f4680000
start commit: 57012c57536f Merge tag 'net-6.5-rc4' of git://git.kernel.o..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=17dfb0f4680000
console output: https://syzkaller.appspot.com/x/log.txt?x=13dfb0f4680000
kernel config: https://syzkaller.appspot.com/x/.config?x=5f28dfd7d77a7042
dashboard link: https://syzkaller.appspot.com/bug?extid=dafbca0e20fbc5946925
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=173a6716a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=111c7c7ea80000
Reported-by: syzbot+dafbca0e20fbc5946925@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 2b9ac22b12a2 ("loop: Fix missing discard support when using LOOP_CONFIGURE")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
