linux-kernel - Re: WARNING in _

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Message-ID: <6389178e-35f2-28a1-4d36-3696bcde6af0@redhat.com>
Date:   Thu, 25 Jul 2019 15:44:54 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     syzbot <syzbot+e58112d71f77113ddb7b@...kaller.appspotmail.com>,
        aarcange@...hat.com, akpm@...ux-foundation.org,
        christian@...uner.io, davem@...emloft.net, ebiederm@...ssion.com,
        elena.reshetova@...el.com, guro@...com, hch@...radead.org,
        james.bottomley@...senpartnership.com, jglisse@...hat.com,
        keescook@...omium.org, ldv@...linux.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-parisc@...r.kernel.org,
        luto@...capital.net, mhocko@...e.com, mingo@...nel.org,
        namit@...are.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk,
        wad@...omium.org
Subject: Re: WARNING in __mmdrop


On 2019/7/25 下午2:02, Michael S. Tsirkin wrote:
> On Mon, Jul 22, 2019 at 11:11:52AM -0300, Jason Gunthorpe wrote:
>> On Sun, Jul 21, 2019 at 06:02:52AM -0400, Michael S. Tsirkin wrote:
>>> On Sat, Jul 20, 2019 at 03:08:00AM -0700, syzbot wrote:
>>>> syzbot has bisected this bug to:
>>>>
>>>> commit 7f466032dc9e5a61217f22ea34b2df932786bbfc
>>>> Author: Jason Wang <jasowang@...hat.com>
>>>> Date:   Fri May 24 08:12:18 2019 +0000
>>>>
>>>>      vhost: access vq metadata through kernel virtual address
>>>>
>>>> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=149a8a20600000
>>>> start commit:   6d21a41b Add linux-next specific files for 20190718
>>>> git tree:       linux-next
>>>> final crash:    https://syzkaller.appspot.com/x/report.txt?x=169a8a20600000
>>>> console output: https://syzkaller.appspot.com/x/log.txt?x=129a8a20600000
>>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=3430a151e1452331
>>>> dashboard link: https://syzkaller.appspot.com/bug?extid=e58112d71f77113ddb7b
>>>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10139e68600000
>>>>
>>>> Reported-by: syzbot+e58112d71f77113ddb7b@...kaller.appspotmail.com
>>>> Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual
>>>> address")
>>>>
>>>> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>>>
>>> OK I poked at this for a bit, I see several things that
>>> we need to fix, though I'm not yet sure it's the reason for
>>> the failures:
>> This stuff looks quite similar to the hmm_mirror use model and other
>> places in the kernel. I'm still hoping we can share this code a bit more.
> Right. I think hmm is something we should look at.


Exactly. I plan to do that.

Thanks