syzbot has bisected this bug to:
commit ef0524d3654628ead811f328af0a4a2953a8310f
Author: Jens Axboe <axboe@xxxxxxxxx>
Date: Thu Oct 24 13:25:42 2019 +0000
io_uring: replace workqueue usage with io-wq
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16acf5d0e00000
start commit: c57cf383 Add linux-next specific files for 20191029
git tree: linux-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=15acf5d0e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=11acf5d0e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=cb86688f30db053d
dashboard link: https://syzkaller.appspot.com/bug?extid=221cc24572a2fed23b6b
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=168671d4e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=140f4898e00000
Reported-by: syzbot+221cc24572a2fed23b6b@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: ef0524d36546 ("io_uring: replace workqueue usage with io-wq")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
