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Date:	Mon, 3 Feb 2014 23:03:23 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Ben Greear <greearb@...delatech.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: IPv6 FIB related crash with MACVLANs in 3.9.11+ kernel.

Hi Ben,

On Mon, Feb 03, 2014 at 12:37:52PM -0800, Ben Greear wrote:
> The kernel has some additional patches, but not much to IPv6.
> 
> The bug is that when we have lots of mac-vlans on some ixgbe ports
> (500 per interface in this case), and boot up the system with the ports unplugged,
> we get this crash almost every time.  Boot-up is going to do normal bootup
> stuff plus create and configure the 1000 mac-vlans, dump their routing
> tables, etc.
> 
> We are using one routing table per network device, and some
> ip rules.
> 
> If we plug in the ixgbe ports, we do not ever see a crash.
> 
> We have not yet tried reproducing it on other drivers, but I suspect
> the issue is not related to ixgbe.
> 
> Any ideas on this one?

Could you bring the machine to a panic again with enabling RT6_DEBUG at the
top of ip6_fib.c and send a dump of the trace?

Thanks,

  Hannes


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