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Date: Thu, 17 Jun 2010 10:36:04 -0700
From: "Luis R. Rodriguez" <lrodriguez@atheros.com>
To: Sankar P <sankar.curiosity@gmail.com>
CC: "rnagarajan@novell.com" <rnagarajan@novell.com>,
       "teheo@novell.com" <teheo@novell.com>,
       Catalin Marinas <catalin.marinas@arm.com>,
       Pekka Enberg <penberg@cs.helsinki.fi>,
       Luis Rodriguez <Luis.Rodriguez@atheros.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: Probable Bug (or configuration error) in kmemleak
Message-ID: <20100617173604.GB28055@tux>
References: <AANLkTikaH5sYv-pa6OEIPCofF8RAbi7F3nTdWqEXWr8J@mail.gmail.com>
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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