Re: Memory leaks with GRE Tunnels

David Ford
2002-01-31T19:35:23Z

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I use GRE tunnels a lot. I have run my rc.networking script several
dozen times with no problems and everything is cranking along nicely.
You can view my scripts at http://blue-labs.org/. I always use a
single numbered interface, "gre1".

However the below really is a bug that should be fixed I would imagine.

David

Deepinder Singh wrote:

> Hi ,
>
> I have been doing some testing using GRE tunnels in Linux ( which btw
> work great ). I found that creating and deleting a tunnel results in a
> memory leak.
>
> To test it out I wrote a small script that basically loops around
> creating and then deleting 8000 tunnel interfaces at a time. On the
> eighth iteration the system hangs a whole with no error messages.
> There was still enoungh virtual memory around even with the leaks so
> I figured something else is wrong. It turns out that the interface
> numbers ( as seen in ' ip link ls' ) do not seem to be reused when an
> interface is deleted and as such the system hangs when the number
> reaches 64K.
>
> I suspect the two issues are realted but am more of a cisco guy and
> know kernel internals. The total mem leak for the 64 K tunnels is
> about 200 megs.
>
> Please cc me if you reply to this post as I am not on the list.
>
> thanks,
> Deepinder Singh
> Sr. Network Eng.
> Soma Networks
>
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