linux-kernel - Re: [Bug 67651] Bisected: Lots of fragmented mmaps cause gimp to fail in 3.12 after exceeding vm_max_map

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Date:	Wed, 22 Jan 2014 23:19:28 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>, gnome@...t.net,
	drawoc@...krefraction.com, alan@...rguk.ukuu.org.uk,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	bugzilla-daemon@...zilla.kernel.org
Subject: Re: [Bug 67651] Bisected: Lots of fragmented mmaps cause gimp to
 fail in 3.12 after exceeding vm_max_map_count

On Wed, Jan 22, 2014 at 07:08:16PM +0000, Mel Gorman wrote:
> Cyrill,
> 
> Gimp is broken due to a kernel bug included in 3.12. It cannot open
> large files without failing memory allocations due to exceeding
> vm.max_map_count. The relevant bugzilla entries are
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=67651
> https://bugzilla.gnome.org/show_bug.cgi?id=719619#c0
> 
> They include details on how to reproduce the issue. In my case, a
> failure shows messages like this
> 
> 	(gimp:11768): GLib-ERROR **: gmem.c:110: failed to allocate 4096 bytes
> 
> 	(file-tiff-load:12038): LibGimpBase-WARNING **: file-tiff-load: gimp_wire_read(): error
> 	xinit: connection to X server lost
> 
> 	waiting for X server to shut down
> 	/usr/lib64/gimp/2.0/plug-ins/file-tiff-load terminated: Hangup
> 	/usr/lib64/gimp/2.0/plug-ins/script-fu terminated: Hangup
> 	/usr/lib64/gimp/2.0/plug-ins/script-fu terminated: Hangup
> 
> X-related junk is there was because I was using a headless server and
> xinit directly to launch gimp to reproduce the bug.
> 
> Automated bisection using mmtests (https://github.com/gormanm/mmtests)
> and the configuration file configs/config-global-dhp__gimp-simple (needs
> local web server with a copy of the image file) identified the following
> commit. Test case was simple -- try and open the large file described in
> the bug. I did not investigate the patch itself as I'm just reporting
> the results of the bisection. If I had to guess, I'd say that VMA
> merging has been affected.

Thanks a lot for report, Mel! I'm investigating...
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