netdev - Re: kernel ipsec error

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Date:	Mon, 11 Jun 2012 18:49:23 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Marco Berizzi <pupilla@...mail.com>
CC:	<netdev@...r.kernel.org>
Subject: Re: kernel ipsec error

On Mon, 2012-06-11 at 14:45 +0200, Marco Berizzi wrote:
> Hello everybody.
> 
> After 12 days uptime I got this message.
> Linux is 3.3.5 32bit, running openswan
> (this is an ipsec gateway/netfilter
> firewall) and squid.
> 
> Jun 11 12:53:02 Pleiadi kernel: SLUB: Unable to allocate memory on node -1 (gfp=0x20)
> Jun 11 12:53:02 Pleiadi kernel:   cache: kmalloc-2048, object size: 2048, buffer size: 2048, default order: 2, min order: 0
> Jun 11 12:53:02 Pleiadi kernel:   node 0: slabs: 61, objs: 476, free: 0
> Jun 11 12:53:02 Pleiadi kernel: kworker/0:2: page allocation failure: order:0, mode:0x4020

So a single page allocation in atomic (non-sleeping) context failed.

[...]
> Jun 11 12:53:02 Pleiadi kernel: Free swap  = 130908kB
> Jun 11 12:53:02 Pleiadi kernel: Total swap = 151164kB
> Jun 11 12:53:02 Pleiadi kernel: 40944 pages RAM
[...]

Not too surprising with this little RAM available (swap didn't help
since we couldn't wait for swap-out).

There could be a memory leak, but you would need to read /proc/meminfo
and /proc/slabinfo at intervals to work out whether that was the case.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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