linux-kernel - Re: 2.6.37: *ERROR* Attempting to mmap a purgeable buffer

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Message-Id: <1bdc18$j72i3m@fmsmga002.fm.intel.com>
Date:	Sun, 09 Jan 2011 12:52:50 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	"Carlos R. Mafra" <crmafra2@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.37: *ERROR* Attempting to mmap a purgeable buffer

On Sun, 9 Jan 2011 13:44:23 +0100, "Carlos R. Mafra" <crmafra2@...il.com> wrote:
> Is there something else I can do to help? Is this something fixable in the
> kernel or was it an error with my hardware? Suddenly being kicked out of X is 
> quite bad, so I hope this can be fixed :-)

It's a use after free bug in the ddx, presumably. I haven't worked out how
yet since all active buffers should be appropriately marked. So either
there is a race in marking the buffer, or we failed to handle an error
appropriately or there is a real use-after-free. The kernel is being
gracious enough to warn you why userspace just crashed.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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