syzbot has bisected this bug to:
commit ed76e329d74a4b15ac0f5fd3adbd52ec0178a134
Author: Jens Axboe <axboe@xxxxxxxxx>
Date: Mon Oct 29 19:06:14 2018 +0000
blk-mq: abstract out queue map
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1558f6fb600000
start commit: b145b0eb Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=1758f6fb600000
console output: https://syzkaller.appspot.com/x/log.txt?x=1358f6fb600000
kernel config: https://syzkaller.appspot.com/x/.config?x=1ec3be9936e004f6
dashboard link: https://syzkaller.appspot.com/bug?extid=d44e1b26ce5c3e77458d
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=165fcefb600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162d03db600000
Reported-by: syzbot+d44e1b26ce5c3e77458d@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: ed76e329d74a ("blk-mq: abstract out queue map")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
