syzbot has bisected this bug to:
commit 29dab2122492f6dbc0b895ca5bd047e166684d1a
Author: Dan Schatzberg <schatzberg.dan@xxxxxxxxx>
Date: Tue Feb 25 04:14:07 2020 +0000
loop: use worker per cgroup instead of kworker
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14d6b01de00000
start commit: 770fbb32 Add linux-next specific files for 20200228
git tree: linux-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=16d6b01de00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12d6b01de00000
kernel config: https://syzkaller.appspot.com/x/.config?x=576314276bce4ad5
dashboard link: https://syzkaller.appspot.com/bug?extid=889cc963ed79ee90f74f
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=176d7f29e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=134c481de00000
Reported-by: syzbot+889cc963ed79ee90f74f@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 29dab2122492 ("loop: use worker per cgroup instead of kworker")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
