RE: kernel ipsec error

bhutchings@solarflare.com wrote:

On Mon, 2012-06-11 at 14:45 +0200, Marco Berizzi wrote:

quoted

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.

[...]

quoted

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).

yes, this is really a very old hardware.

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.

Kindly, may you tell me which should be the intervals? One second? one minute?