linux-kernel - Re: 3.6.11: khubd issue SLAB related?

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Date:	Mon, 11 Mar 2013 14:23:28 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Udo van den Heuvel <udovdh@...all.nl>
cc:	Hans de Goede <hdegoede@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: 3.6.11: khubd issue SLAB related?

On Fri, 8 Mar 2013, Udo van den Heuvel wrote:

> [3663200.799579] SLAB: Unable to allocate memory on node 0 (gfp=0xd0)
> [3663200.799581]   cache: size-65536, object size: 65536, order: 4
> [3663200.799583]   node 0: slabs: 6/6, objs: 6/6, free: 0
> [3663200.799585] pwc: Oops, could not allocate memory for pwc_device.

You have memory freed, but like your earlier page allocation failure on 
mount, it is too fragmented.  This is an order-4 page allocation, the 
kmalloc() of struct pwc_device, and you don't even have any order-3 pages 
that are available.  Are you running with CONFIG_COMPACTION enabled?

If not, enable it and try again, or get root and manually try to 
defragment memory by doing echo 1 > /proc/sys/vm/compact_memory.

If so, try killing a memory hogging process to free some memory and 
attempt to get some higher order pages available.
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