linux-kernel - Re: INFO: task hung in vhost_net_stop

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Date:   Mon, 25 Mar 2019 10:02:43 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     syzbot <syzbot+d21e6e297322a900c128@...kaller.appspotmail.com>
Cc:     jasowang@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        virtualization@...ts.linux-foundation.org, weiyj.lk@...il.com
Subject: Re: 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@...hat.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@...kaller.appspotmail.com
> Fixes: 6b1e6cc7 ("vhost: new device IOTLB API")