linux-kernel - Re: kmemleak disabled itself in 2.6.36

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Message-ID: <1288254789.10238.5.camel@e102109-lin.cambridge.arm.com>
Date:	Thu, 28 Oct 2010 09:33:09 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	linux-kernel@...r.kernel.org,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>
Subject: Re: kmemleak disabled itself in 2.6.36

On Wed, 2010-10-27 at 20:12 +0100, Toralf Förster wrote:
> I'm unsure whether this happens due to a
> $> sudo su -c "echo clear > /sys/kernel/debug/kmemleak"
> or while regular scanning, but anyway seems not to be normal, or ?
> 
> 2010-10-27T20:42:21.697+02:00 n22 kernel: flush-254:0: page allocation failure. order:0, mode:0x0
[...]
> 2010-10-27T20:42:21.699+02:00 n22 kernel: kmemleak: Cannot allocate a kmemleak_object structure
> 2010-10-27T20:42:21.699+02:00 n22 kernel: Pid: 15475, comm: flush-254:0 Not tainted 2.6.36 #2
[...]
> 2010-10-27T20:42:21.700+02:00 n22 kernel: kmemleak: Kernel memory leak detector disabled

Are you running out of memory on your system? Kmemleak tried to allocate
a structure but the slab allocator failed to get page. Kmemleak disables
itself in such situations but the problem is somewhere else (not enough
memory?).

Catalin

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