linux-kernel - Re: Probable Bug (or configuration error) in kmemleak

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Date:	Thu, 17 Jun 2010 10:36:04 -0700
From:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
To:	Sankar P <sankar.curiosity@...il.com>
CC:	"rnagarajan@...ell.com" <rnagarajan@...ell.com>,
	"teheo@...ell.com" <teheo@...ell.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: Probable Bug (or configuration error) in kmemleak

On Thu, Jun 17, 2010 at 02:21:56AM -0700, Sankar P wrote:
> Hi,
> 
> I wanted to detect memory leaks in one of my kernel modules. So I
> built Linus' tree  with the following config options enabled (on top
> of make defconfig)
> 
> CONFIG_DEBUG_KMEMLEAK=y
> CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE=400
> CONFIG_DEBUG_KMEMLEAK_TEST=y
> 
> If I boot with this kernel, debugfs is automatically mounted. But I do
> not have the file:
> 
> /sys/kernel/debug/kmemleak
> 
> created at all. There are other files like kprobes in the mounted
> /sys/kernel/debug directory btw. So I am not able to detect any of the
> memory leaks. Is there anything I am doing wrong or missing (or) is
> this a bug in kmemleak ?
> 
> Please let me know your suggestions to fix this and get memory leaks
> reporting working. Thanks.
> 
> The full .config file is also attached with this mail. Sorry for the
> attachment, I did not want to paste 5k lines in the mail. Sorry if it
> is wrong.


This is odd.. Do you see this message on your kernel ring buffer?

Failed to create the debugfs kmemleak file

  Luis
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