Re: Memory leaks with GRE Tunnels

[David Ford <david+cert@blue-labs.org>]

[-- Attachment #1: Type: text/plain, Size: 1587 bytes --]

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
>
> -
> To unsubscribe from this list: send the line "unsubscribe 
> linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/



[-- Attachment #2: S/MIME Cryptographic Signature --]
[-- Type: application/x-pkcs7-signature, Size: 3269 bytes --]