Re: [syzbot] [ext4?] INFO: task hung in ext4_stop_mmpd

[syzbot]

syzbot has bisected this issue to:

commit 21175ca434c5d49509b73cf473618b01b0b85437
Author: Harshad Shirwadkar <harshadshirwadkar@xxxxxxxxx>
Date:   Thu Apr 1 17:21:29 2021 +0000

    ext4: make prefetch_block_bitmaps default

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1427bf00580000
start commit:   4a39ac5b7d62 Merge tag 'random-6.12-rc1-for-linus' of git:..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1627bf00580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1227bf00580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dd14c10ec1b6af25
dashboard link: https://syzkaller.appspot.com/bug?extid=0dd5b81275fa083055d7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14fbd177980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=108ea607980000

Reported-by: syzbot+0dd5b81275fa083055d7@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 21175ca434c5 ("ext4: make prefetch_block_bitmaps default")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection