netdev - Re: batman-adv: gpf in batadv_slide_own_bcast

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Date:	Fri, 22 Feb 2013 13:37:06 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Antonio Quartulli <ordex@...istici.org>
CC:	Marek Lindner <lindner_marek@...oo.de>,
	Simon Wunderlich <siwu@....tu-chemnitz.de>,
	"David S. Miller" <davem@...emloft.net>,
	b.a.t.m.a.n@...ts.open-mesh.org, netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: batman-adv: gpf in batadv_slide_own_bcast_window

On 02/22/2013 12:06 PM, Antonio Quartulli wrote:
> Hi Sasha and thank you very much for reporting this issue.
> 
> IIRC this is similar to a bug you already reported in the past.
> This bug should be the result of a race condition batman-adv has in the
> hard-interface handling code (this is why it has been triggered while removing
> eth0).
> 
> Now that the rtnl-deadlock has been solved I think we can try to further
> investigate on this bug and try to find a solution..though it will not be easy
> as it probably requires another lock to protect the hard-interface during this
> operations.
> 
> If you have any fix proposal feel free to contribute!

I'm confused about how batadv_orig_hash_del_if removes an interface from the
hashtable. I see the hashtable is using rcu to protect it, but when we
delete an entry we free it straight away by calling batadv_orig_node_del_if()
and not going through kfree_rcu().

Is there a reason behind doing that, or might it be the cause of the problem
we're seeing here?


Thanks,
Sasha
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