From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: Re: hang in pvfb resulting from save/restore?
Date: Tue, 27 May 2008 19:51:23 +0100
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To: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: Xen-devel <xen-devel@lists.xensource.com>, Markus Armbruster <armbru@redhat.com>
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Jaya Kumar wrote:
> Is this a scenario where multiple processes are mapping identical
> framebuffer areas simultaneously? If so, there is a bug in defio that
> corrupts the pagelist. I posted a  patch for that here:
>
> http://marc.info/?l=linux-fbdev-devel&m=120935156922859&w=2
>
> I hope that helps.
>   

Not sure.  It's X using its /dev/fb driver.  I don't think anything else 
will have mapped the framebuffer in that case.

I'll do some more experiments with list debugging enabled, to see if 
that shakes out any problems.

I'll try your patch, since it doesn't seem to be in current -git.  The 
spinning around the list is a common symptom of adding something to a 
list more than once.

    J