netdev - Re: LOCKDEP complaints in l2tp_xmit

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Message-ID: <1340873862.13187.5.camel@edumazet-glaptop>
Date:	Thu, 28 Jun 2012 10:57:42 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Parkin <tparkin@...alix.com>,
	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: LOCKDEP complaints in l2tp_xmit_skb()

On Thu, 2012-06-28 at 08:56 +0200, Eric Dumazet wrote:

> [PATCH] net: Qdisc busylock gets its own lockdep class
> 
> Tom Parkin reported following LOCKDEP splat :
..
> 
> Instruct lockdep that each Qdisc busylock is independant, or else
> bonding or various tunnels can trigger a splat.
> 
> Reported-by: Tom Parkin <tparkin@...alix.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---

I reproduced the bug using a bond0 device, adding a qdisc on it,
(one Qdisc on bond0, and a Qdisc on the slave too)

Problem with this patch is I have following message :

BUG: key ffff88..... not in .data!

No more LOCKDEP splat, but patch not good as is.



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