linux-kernel - Re: Memory corruption in powerpc guests with virtio_balloon (was Re: [PATCH v3] virtio

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Date:   Sun, 03 Dec 2017 21:04:40 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Michal Hocko <mhocko@...e.com>,
        Wei Wang <wei.w.wang@...el.com>,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        "linuxppc-dev\@lists.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: Memory corruption in powerpc guests with virtio_balloon (was Re: [PATCH v3] virtio_balloon: fix deadlock on OOM)

"Michael S. Tsirkin" <mst@...hat.com> writes:
> On Fri, Dec 01, 2017 at 11:31:08PM +1100, Michael Ellerman wrote:
>> "Michael S. Tsirkin" <mst@...hat.com> writes:
>> 
>> > fill_balloon doing memory allocations under balloon_lock
>> > can cause a deadlock when leak_balloon is called from
>> > virtballoon_oom_notify and tries to take same lock.
...
>> 
>> 
>> Somehow this commit seems to be killing powerpc guests.
...
>
> Thanks for the report!
> A fix was just posted:
> virtio_balloon: fix increment of vb->num_pfns in fill_balloon()
>
> Would appreciate testing.

Yep that fixes it. Thanks.

Tested-by: Michael Ellerman <mpe@...erman.id.au>

cheers