linux-kernel - DRM-related kmalloc-32 memory leak in 2.6.35

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Date:	Wed, 25 Aug 2010 15:59:09 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Christoph Lameter <cl@...ux.com>, David Airlie <airlied@...ux.ie>
Cc:	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linux Mailing List <linux-kernel@...r.kernel.org>
Subject: DRM-related kmalloc-32 memory leak in 2.6.35

On Tue, 2010-08-24 at 10:37 -0500, Christoph Lameter wrote:
> On Tue, 24 Aug 2010, Matt Mackall wrote:
> 
> > kmalloc-32        1113344 1113344     32  128    1 : tunables    0    0
> > 0 : slabdata   8698   8698      0
> >
> > That's /proc/slabinfo on my laptop with SLUB. It looks like my last
> > reboot popped me back to 2.6.33 so it may also be old news, but I
> > couldn't spot any reports with Google.
> 
> Boot with "slub_debug" as a kernel parameter
> 
> and then do a
> 
> cat /sys/kernel/slab/kmalloc-32/alloc_calls
> 
> to find the caller allocating the objets.

Still present in 2.6.35. Appears to be DRM:

    845 drm_vm_open_locked+0x72/0x109 age=43/37572/59269 pid=2089
cpus=0-1

That's after about a minute of uptime. Grows to 100k in about a day.

dmesg bits:
[    0.834653] [drm] Initialized drm 1.1.0 20060810
[    0.834986] pci 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    0.834995] pci 0000:00:02.0: setting latency timer to 64
[    1.002572] mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining
[    1.002580] [drm] MTRR allocation failed.  Graphics performance may suffer.
[    1.019880] acpi device:03: registered as cooling_device2
[    1.021520] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input3
[    1.021543] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[    1.021855] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0

This is with:

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 03)

-- 
Mathematics is the supreme nostalgia of our time.


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