From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen.hemminger@vyatta.com>
Subject: Re: net-next: 2.6.34-rc1 regression: panic when running diagnostic
 on interface with IPv6
Date: Fri, 9 Apr 2010 19:21:13 -0700 (PDT)
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Cc: David Miller <davem@davemloft.net>, netdev@vger.kernel.org
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> 
> I played with it some more to get the exact commands. Looks like the
> following should repro it:
> 
> ifconfig eth0 inet6 add fec0::1509/112 up
> ethtool -t eth0
> ifconfig eth0 inet6 del fec0::1509/112

Yes, that causes WARN() to trigger, but only if there is a delay
between ethtool (down/up transition) and the address delete.