linux-kernel - Re: Memory leak issues in drm

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Message-Id: <1247733888.24965.3.camel@pc1117.cambridge.arm.com>
Date:	Thu, 16 Jul 2009 09:44:48 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Dave Airlie <airlied@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, airlied@...il.com,
	LKML <linux-kernel@...r.kernel.org>,
	Eric Anholt <eric@...olt.net>
Subject: Re: Memory leak issues in drm

On Thu, 2009-07-16 at 12:39 +0530, Jaswinder Singh Rajput wrote:
> On Thu, 2009-07-16 at 10:37 +0530, Jaswinder Singh Rajput wrote:
> > On linus tree, while investigating kmemleak issues in drm :
> > 
> > unreferenced object 0xf571dea0 (size 32):
> >   comm "Xorg", pid 1992, jiffies 4294703188
> >   backtrace:
> >     [<c1096655>] create_object+0x140/0x210
> >     [<c10967f2>] kmemleak_alloc+0x25/0x4b
> >     [<c1093b63>] __kmalloc+0xcb/0x153
> >     [<c11ae939>] drm_setversion+0x154/0x1f6
> >     [<c11ad0b1>] drm_ioctl+0x211/0x296
> >     [<c10a2dc9>] vfs_ioctl+0x50/0x69
> >     [<c10a3321>] do_vfs_ioctl+0x49b/0x4d5
> >     [<c10a3387>] sys_ioctl+0x2c/0x45
> >     [<c1002988>] sysenter_do_call+0x12/0x36
> >     [<ffffffff>] 0xffffffff
> > 
> 
> This fixes above memory leak in drm because it was allocating again on
> dev->devname without freeing previous instance and more memory related
> issues, hope this will be helpful:

Thanks for looking into this (I haven't tried the patch yet but it seems
that you found the cause of the leak).

In case you have time, I reported this as well and another in the drm
code - http://lkml.org/lkml/2009/7/9/110 - which happens when a graphics
application exits.

-- 
Catalin

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