From: "Michael S. Tsirkin" <mst@redhat.com>
To: Link Lin <linkl@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@kernel.org>,
David Hildenbrand <david@kernel.org>,
virtualization@lists.linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, prasin@google.com,
rientjes@google.com, duenwen@google.com, jasowang@redhat.com,
xuanzhuo@linux.alibaba.com,
Ammar Faizi <ammarfaizi2@openresty.com>,
jiaqiyan@google.com, ahwilkins@google.com,
Greg Thelen <gthelen@google.com>,
Alexander Duyck <alexander.duyck@gmail.com>,
jthoughton@google.com, stable@vger.kernel.org
Subject: Re: [PATCH v3] mm/page_reporting: use system_freezable_wq to fix UAF during suspend
Date: Fri, 31 Jul 2026 20:16:47 -0400 [thread overview]
Message-ID: <20260731201559-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <CALUx4KRoCco0HA=Y_qFzSD=CegbJPUkQkvjRb1Y3UcgRdwQToA@mail.gmail.com>
On Fri, Jul 31, 2026 at 01:21:40PM -0700, Link Lin wrote:
> On Thu, Jul 23, 2026 at 2:15 AM Michael S. Tsirkin <mst@redhat.com> wrote:
> >
> > I suspect rest of work items we have, e.g. update_balloon_stats_work/update_balloon_size_work
> > all have issues around freeze/restore and error handling.
> >
> > --
> > MST
> >
>
> Hi Michael,
>
> We have indeed discovered a kernel crash in update_balloon_stats_work
> after the balloon driver failed to resume and initialize in our
> production fleet.
>
> Alex Wilkins <ahwilkins@google.com> diagnosed, root caused, and
> reported this vulnerability.
I wouldn't call this a "vulnerability" just a garden variety bug.
> I am currently drafting and testing a
> 2-patch series to gracefully unregister callbacks and cancel work
> items on resume failure so that the VM continues running without the
> balloon driver instead of crashing with a kernel panic.
>
> I wanted to follow up and let you know that we are actively working on
> this. I will send out the patches to the list as soon as they are
> sufficiently tested.
>
> Best,
> Link
prev parent reply other threads:[~2026-08-01 0:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-21 0:55 [PATCH v3] mm/page_reporting: use system_freezable_wq to fix UAF during suspend Link Lin
2026-07-23 0:36 ` Andrew Morton
2026-07-23 4:07 ` Link Lin
2026-07-23 9:15 ` Michael S. Tsirkin
2026-07-31 20:21 ` Link Lin
2026-08-01 0:16 ` Michael S. Tsirkin [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260731201559-mutt-send-email-mst@kernel.org \
--to=mst@redhat.com \
--cc=ahwilkins@google.com \
--cc=akpm@linux-foundation.org \
--cc=alexander.duyck@gmail.com \
--cc=ammarfaizi2@openresty.com \
--cc=david@kernel.org \
--cc=duenwen@google.com \
--cc=gthelen@google.com \
--cc=jasowang@redhat.com \
--cc=jiaqiyan@google.com \
--cc=jthoughton@google.com \
--cc=linkl@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=prasin@google.com \
--cc=rientjes@google.com \
--cc=stable@vger.kernel.org \
--cc=vbabka@kernel.org \
--cc=virtualization@lists.linux.dev \
--cc=xuanzhuo@linux.alibaba.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox