linux-kernel - Re: kernel BUG at drivers/vhost/vhost.c:LINE! (2)

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Message-ID: <CAJSP0QUgySKEk79EzFSQAdTfbmFRE+CdJPkLdV5+6MoX6tf3eg@mail.gmail.com>
Date:   Mon, 9 Apr 2018 21:17:35 +0800
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     syzbot <syzbot+65a84dde0214b0387ccd@...kaller.appspotmail.com>,
        Jason Wang <jasowang@...hat.com>, kvm <kvm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        Linux Virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: kernel BUG at drivers/vhost/vhost.c:LINE! (2)

On Mon, Apr 9, 2018 at 11:28 AM, Stefan Hajnoczi <stefanha@...il.com> wrote:
> On Mon, Apr 09, 2018 at 05:44:36AM +0300, Michael S. Tsirkin wrote:
>> On Mon, Apr 09, 2018 at 10:37:45AM +0800, Stefan Hajnoczi wrote:
>> > On Sat, Apr 7, 2018 at 3:02 AM, syzbot
>> > <syzbot+65a84dde0214b0387ccd@...kaller.appspotmail.com> wrote:
>> > > syzbot hit the following crash on upstream commit
>> > > 38c23685b273cfb4ccf31a199feccce3bdcb5d83 (Fri Apr 6 04:29:35 2018 +0000)
>> > > Merge tag 'armsoc-drivers' of
>> > > git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
>> > > syzbot dashboard link:
>> > > https://syzkaller.appspot.com/bug?extid=65a84dde0214b0387ccd
>> >
>> > To prevent duplicated work: I am working on this one.
>> >
>> > Stefan
>>
>> Do you want to try this patchset:
>> https://lkml.org/lkml/2018/4/5/665
>>
>> ?
>
> Thanks, I'll give it a shot.
>
> I also noticed a regression in commit
> d65026c6c62e7d9616c8ceb5a53b68bcdc050525 ("vhost: validate log when
> IOTLB is enabled") and am currently testing a fix.

I have sent a fix:
https://lkml.org/lkml/2018/4/9/390

Stefan