netdev - Re: [PATCH] ifb: fix rcu_sched self-detected stalls

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Message-Id: <20130710.184435.1686234758615260434.davem@davemloft.net>
Date:	Wed, 10 Jul 2013 18:44:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dingtianhong@...wei.com
Cc:	edumazet@...gle.com, kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [PATCH] ifb: fix rcu_sched self-detected stalls

From: Ding Tianhong <dingtianhong@...wei.com>
Date: Wed, 10 Jul 2013 12:04:02 +0800

> According to the commit 16b0dc29c1af9df341428f4c49ada4f626258082
> (dummy: fix rcu_sched self-detected stalls)
> 
> Eric Dumazet fix the problem in dummy, but the ifb will occur the
> same problem like the dummy modules.
> 
> Trying to "modprobe ifb numifbs=30000" triggers :
> 
> INFO: rcu_sched self-detected stall on CPU
> 
> After this splat, RTNL is locked and reboot is needed.
> 
> We must call cond_resched() to avoid this, even holding RTNL.
> 
> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>

Applied and queued up for -stable, thanks.
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