linux-kernel - Re: mmotm 2010-04-05-16-09 uploaded

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Message-ID: <8356.1270774206@localhost>
Date:	Thu, 08 Apr 2010 20:50:06 -0400
From:	Valdis.Kletnieks@...edu
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: mmotm 2010-04-05-16-09 uploaded

On Thu, 08 Apr 2010 17:36:07 +0200, Patrick McHardy said:

> Valdis.Kletnieks@...edu wrote:

> > Well, it *changed* it.  Does the rcu_defererence_check() only fire on the
> > first time it hits something, so we've fixed the first one and now we get to
> > see the second one?
> 
> It appears that way, otherwise you should have seen a second warning in
> nf_conntrack_ecache the last time.
> 
> > (For what it's worth, if this is going to be one-at-a-time whack-a-mole, I'm
> > OK on that, just want to know up front.)
> 
> I went through the other files and I believe this should be it.
> We already removed most of these incorrect rcu_dereference()
> calls a while back.

Confirming - the second version of the patch fixes all the network-related
RCU complaints I've been able to trigger...

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