syzbot has bisected this bug to:
commit a21f2a3ec62abe2e06500d6550659a0ff5624fbb
Author: Michael Callahan <michaelcallahan@xxxxxx>
Date: Tue May 3 15:12:49 2016 +0000
block: Minor blk_account_io_start usage cleanup
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13565e92600000
start commit: be8454af Merge tag 'drm-next-2019-07-16' of git://anongit...
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=10d65e92600000
console output: https://syzkaller.appspot.com/x/log.txt?x=17565e92600000
kernel config: https://syzkaller.appspot.com/x/.config?x=d23a1a7bf85c5250
dashboard link: https://syzkaller.appspot.com/bug?extid=e682cca30bc101a4d9d9
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=155c5800600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1738f800600000
Reported-by: syzbot+e682cca30bc101a4d9d9@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: a21f2a3ec62a ("block: Minor blk_account_io_start usage cleanup")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
