From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: vnc=1 / pvgrub / close fb: backend at
 /local/domain/0/backend/vfb/xx/0
Date: Wed, 22 Oct 2014 16:40:05 +0100
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To: Steven Haigh <netwiz@crc.id.au>
Cc: Anthony Perard <anthony.perard@citrix.com>, Samuel Thibault <samuel.thibault@ens-lyon.org>, xen-devel@lists.xen.org, Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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On Thu, 2014-10-23 at 02:23 +1100, Steven Haigh wrote:

> Output using pv-grub:

Can you also post the qemu logs please (under /var/log/xen somewhere I
think).

> qemu-system-i38[3956]: segfault at 0 ip           (null) sp
> 00007fffb4573638 error 4

That might be a smoking gun. Is there a core dump and/or could you try
and run qemu under gdb?

Ian.