full-disclosure - Re: How to lock up a VirtualBox host machine with a guest using tracepath over virtio-net network interface

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Message-ID: <CACqxkW+h9FT6PRX2gU+xDQ96V4ejSvz_He6zPMxWm_29eeOUNw@mail.gmail.com>
Date: Thu, 27 Jun 2013 00:17:45 +0100
From: Nick Boyce <nick.boyce@...il.com>
To: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: How to lock up a VirtualBox host machine with
 a guest using tracepath over virtio-net network interface

On 6/21/13, Thomas Dreibholz <dreibh@...ula.no> wrote:

> I have discovered a problem with the VirtualBox virtio-net network driver
> that leads to a lockup of the host machine's kernel and the need for a
> hard reset to make it working again. The bug had been reported to the
> VirtualBox bug tracker 8 days ago
> (https://www.virtualbox.org/ticket/11863), with the usual reaction from
> Oracle support (i.e. none).

FWIW: *not* confirmed for :
64-bit Linux host = Debian Squeeze 6.0.7 amd64
32-bit Linux guest = Debian Squeeze 6.0.7 i386
VirtualBox = 4.1.26 (guest network adapter set to virtio for the test)

'$ tracepath 8.8.8.8' run in the guest works fine, and no unpleasant
effects are noticed on either host or guest.

I note that VirtualBox 4.1.26 (latest update to 4.1 series) was
released on the same day as 4.2.14 (latest update to 4.2 series) -
specifically 21st.June.2013 - which happens to be the same day you
reported the problem here after getting apparently zero response from
Oracle Support for 8 days.  Maybe they just silently fixed the bug
during those 8 days - in which case they should have had the manners
to let you know.

Cheers
Nick Boyce
-- 
I can't watch TV longer than five minutes without praying for nuclear
holocaust ~~ Bill Hicks

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