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Date: Thu, 27 Mar 2008 13:49:28 +0100
From: Jarek Poplawski <jarkao2@gmail.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>, netdev@vger.kernel.org,
       bugme-daemon@bugzilla.kernel.org, marcus@better.se,
       Stephen Hemminger <shemminger@linux-foundation.org>,
       "Rafael J. Wysocki" <rjw@sisk.pl>, LKML <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>
Subject: Re: [Bugme-new] [Bug 10326] New: inconsistent lock state in
	net_rx_action
Message-ID: <20080327124928.GE2845@ami.dom.local>
References: <bug-10326-10286@http.bugzilla.kernel.org/> <20080325134320.21525479.akpm@linux-foundation.org> <47EAD8A5.3070806@gmail.com> <20080326171403.ad186037.akpm@linux-foundation.org> <20080327085542.GA2778@ami.dom.local> <20080327021812.601776b8.akpm@linux-foundation.org> <1206615379.8514.502.camel@twins> <20080327122255.GC2845@ami.dom.local> <1206621014.8514.563.camel@twins>
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On Thu, Mar 27, 2008 at 01:30:14PM +0100, Peter Zijlstra wrote:
...
> My guess is that it is a race between polling the device and irq pushing
> the packet. That is, normally the IRQ handler wins and netpoll doesn't
> have anything to do and it doesn't traverse this code path.
> 
> (although I must admit to being a little out of my depth here)

Probably you're right but there were really a lot of testing and
stressing netconsole for misterious lockups for quite a long time
with this new napi, so it's hard to believe this was hidden so
well...

Jarek P.