netdev - Re: [patch 1/1] [PATCH BUG_FIX] ipv6: fix refcnt problem related to POSTDAD state

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Message-Id: <20101027.111014.260072078.davem@davemloft.net>
Date:	Wed, 27 Oct 2010 11:10:14 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	ursula.braun@...ibm.com, netdev@...r.kernel.org,
	linux-s390@...r.kernel.org, vosburgh@...ibm.com
Subject: Re: [patch 1/1] [PATCH BUG_FIX] ipv6: fix refcnt problem related
 to POSTDAD state

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Mon, 25 Oct 2010 16:01:32 -0700

> On Mon, Oct 25, 2010 at 11:06:43AM +0200, Ursula Braun wrote:
>> Subject: [patch 1/1] [PATCH BUG_FIX] ipv6: fix refcnt problem related to POSTDAD state
>> 
>> From: Ursula Braun <ursula.braun@...ibm.com>
>> 
>> After running this bonding setup script
>>     modprobe bonding miimon=100 mode=0 max_bonds=1
>>     ifconfig bond0 10.1.1.1/16
>>     ifenslave bond0 eth1
>>     ifenslave bond0 eth3
>> on s390 with qeth-driven slaves, modprobe -r fails with this message
>>     unregister_netdevice: waiting for bond0 to become free. Usage count = 1
>> due to twice detection of duplicate address.
>> Problem is caused by a missing decrease of ifp->refcnt in addrconf_dad_failure.
>> An extra call of in6_ifa_put(ifp) solves it.
>> Problem has been introduced with commit f2344a131bccdbfc5338e17fa71a807dee7944fa.
>> 
>> Signed-off-by: Ursula Braun <ursula.braun@...ibm.com>
>> Cc: David S. Miller <davem@...emloft.net>
> 
> Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
> 
> Thanks for catching this!

Applied, thanks everyone.
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