netdev - Re: oops / kernel panic in bonding.

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Message-ID: <20110321063712.GB2836@psychotron.redhat.com>
Date:	Mon, 21 Mar 2011 07:37:13 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>
Cc:	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: oops / kernel panic in bonding.

Sun, Mar 20, 2011 at 10:19:21PM CET, nicolas.2p.debian@...il.com wrote:
>Le 20/03/2011 21:17, Nicolas de Pesloüan a écrit :
>>Hi Jiri,
>>
>>I suspect we have a race condition somewhere in the new
>>bond_handle_frame function:
>>
>>The following commands produce one of the following errors:
>>
>>modprobe bonding max_bonds=0
>>echo +bond0>/sys/class/net/bonding_masters
>>echo +bond1>/sys/class/net/bonding_masters
>>echo +eth1>/sys/class/net/bond1/bonding/slaves
>>
>>This is mostly reproducible, under VirtualBox.
>>
>>All tests done with 08351fc6a75731226e1112fc7254542bd3a2912e at the top
>>commit (current net-next-2.6).
>
>I suspect netdev_rx_handler_register is called too early in bond_enslave.
>
>I think it should be the last thing we do in bond_enslave, if we
>don't want to face the risk to have bond_handle_frame being called
>before everything is properly setup.
>
>	Nicolas.

Hmm, Offset 0x280 is big, I suggest dev->master is not set. Will look at
this.
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