From: Konstantin Khorenko <khorenko@virtuozzo.com>
To: "Denis V. Lunev" <den@openvz.org>
Cc: devel@openvz.org
Subject: Re: [Devel] [PATCH 1/1] ms/virtio_ring: fix infinite loop in virtnet_poll_cleantx when device is broken
Date: Mon, 31 Aug 2026 19:32:58 +0200 [thread overview]
Message-ID: <178819757869.1127482.15682637207725805037.b4-review@b4> (raw)
In-Reply-To: <20260831151637.1335671-1-den@openvz.org>
On Mon, 31 Aug 2026 17:16:37 +0200, Denis V. Lunev <den@openvz.org> wrote:
> virtnet_poll_cleantx() contains a do-while loop that cleans up
> transmitted TX buffers and calls virtqueue_enable_cb_delayed() to check
> whether more buffers need processing. When the virtio backend stops
> responding during guest reboot, used->idx is never updated, so
> virtqueue_enable_cb_delayed() always returns false and the loop never
> terminates. Then it will block reboot process, and the guest will hang.
>
> [...]
Reviewed-by: Konstantin Khorenko <khorenko@virtuozzo.com>
--
Konstantin Khorenko <khorenko@virtuozzo.com>
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next prev parent reply other threads:[~2026-08-31 17:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-31 15:16 Denis V. Lunev
2026-08-31 17:32 ` Konstantin Khorenko [this message]
2026-08-31 17:53 ` Konstantin Khorenko
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