linux-kernel - Re: kmemleak failure (was Re: backing up ext4 fs, system unresponsive, thrashing like crazy even though swap is unused)

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Message-ID: <1353885594.22969.34.camel@soupermouf>
Date:	Mon, 26 Nov 2012 01:19:54 +0200
From:	Dimitrios Apostolou <jimis@....net>
To:	linux-kernel@...r.kernel.org
Subject: Re: kmemleak failure (was Re: backing up ext4 fs, system
 unresponsive, thrashing like crazy even though swap is unused)

On Mon, 2012-11-26 at 00:41 +0200, Dimitrios Apostolou wrote:
> Hello,
> 
> I tried running a kmemleak and DEBUG_SLUB enabled kernel, but almost
> within 5 minutes of starting the backup process, I got:
> 
> [  486.863124] kmemleak: Cannot allocate a kmemleak_object structure
> [  486.887195] kmemleak: Automatic memory scanning thread ended
> [  486.906604] kmemleak: Kernel memory leak detector disabled

Important detail: I decided to try kmemleak after suspecting a leak
because 'echo 3>/proc/sys/vm/drop_caches' left about 90MB out of 118MB
of ext4_inode_cache, and I found no way to get rid of that (via
remounting filesystems for example).


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