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SubjectRe: INFO: task hung in vhost_net_stop_vq
Looks like more iotlb locking mess?

On Tue, Mar 19, 2019 at 10:21:00PM -0700, syzbot wrote:
> syzbot has bisected this bug to:
>
> commit 6b1e6cc7855b09a0a9bfa1d9f30172ba366f161c
> Author: Jason Wang <jasowang@redhat.com>
> Date: Thu Jun 23 06:04:32 2016 +0000
>
> vhost: new device IOTLB API
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1486ad27200000
> start commit: 6b1e6cc7 vhost: new device IOTLB API
> git tree: upstream
> final crash: https://syzkaller.appspot.com/x/report.txt?x=1686ad27200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1286ad27200000
> kernel config: https://syzkaller.appspot.com/x/.config?x=c94f9f0c0363db4b
> dashboard link: https://syzkaller.appspot.com/bug?extid=d21e6e297322a900c128
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=141db34d400000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=108ef293400000
>
> Reported-by: syzbot+d21e6e297322a900c128@syzkaller.appspotmail.com
> Fixes: 6b1e6cc7 ("vhost: new device IOTLB API")

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