netdev - Re: Multicast routing stops functioning after 4G multicast packets recived.

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Message-ID: <1387473858.19078.362.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 19 Dec 2013 09:24:18 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Bob Falken <NetFestivalHaveFun@....com>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Ben Greear <greearb@...delatech.com>, netdev@...r.kernel.org
Subject: Re: Multicast routing stops functioning after 4G multicast packets
 recived.

On Thu, 2013-12-19 at 17:28 +0100, Bob Falken wrote:
> The only reason why i give information about 2.6.36.4 is that its the
> only latest kernel that was functioning properly.
> i.e kernel >= 2.6.37 is not woking. so its a bisecting of the kernel
> versions to help a coder see when/where the isse was implemented in
> the kernel.
> 
> I do not need a backport patch for an old kernel, I generally only
> need the issue looked into and get fixed so that I dont have to use an
> old kernel. :)
> 
> I have no issue reproducing the issue on the recent kernels. however i
> have not tried the GIT kernel.
> 
> I restarted the server just a moment ago. i will install and run
> dropwatch and provide feedback in about 17hours. 

You said that "cat /proc/net/ip_mr_cache" gives nothing at all after
2^32 packets ?

Thats a bit scary ... maybe a 32bit refcnt overflow, because of some
imbalance...


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