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syzbot has bisected this bug to:

commit 2da22da573481cc4837e246d0eee4d518b3f715e
Author: Mike Christie <mchristi@redhat.com>
Date:   Tue Aug 13 16:39:52 2019 +0000

    nbd: fix zero cmd timeout handling v2

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11d6ab14100000
start commit:   e99332e7 gcc-10: mark more functions __init to avoid secti..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=13d6ab14100000
console output: https://syzkaller.appspot.com/x/log.txt?x=15d6ab14100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8a96cf498e199d8b
dashboard link: https://syzkaller.appspot.com/bug?extid=518c54e255b5031adde4
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=146e45ec100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=164444a4100000

Reported-by: syzbot+518c54e255b5031adde4@syzkaller.appspotmail.com
Fixes: 2da22da57348 ("nbd: fix zero cmd timeout handling v2")

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