[CentOS] rt_cache leak in 2.6.18

Thu Feb 12 08:07:53 UTC 2009
Peter Kjellstrom <cap at nsc.liu.se>

On Wednesday 11 February 2009, Hector Herrera wrote:
...
> After about 2-3 days, the kernel complains about "dst cache overflow" and
> even thought it hasn't crashed, the network is
> un-responsive.  All IP forwarding stops and the server cannot be reached
> from any network interfaces.
...
> According to
> http://linux.derkeiler.com/Mailing-Lists/Fedora/2005-07/1175.html this is
> a known bug that was fixed in 2.6.11, however, I'm running 2.6.18 (as
> updated with `yum update`)
>
> I downloaded the kernel sources, and indeed, the kernel source contains
> the bug fix in the above article.
>
> Therefore ... I'm at a loss as to where to go from here.  Certainly
> rebooting the server every day is not an option, and increasing the
> max_size will just delay it.
>
> Suggestions?

Have a look around the upstream (rh) bugzilla to see if there is a fix in the 
pipe. If not then you'll have to either run a newer kernel or add the patch 
to the centos-kernel and rebuild it (both ways are quite messy).

/Peter

> Thank you,
>
> Hector
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