linux-kernel - Re: [Bugme-new] [Bug 10326] New: inconsistent lock state in net_rx

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Message-ID: <20080327122255.GC2845@ami.dom.local>
Date:	Thu, 27 Mar 2008 13:22:55 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
	bugme-daemon@...zilla.kernel.org, marcus@...ter.se,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [Bugme-new] [Bug 10326] New: inconsistent lock state in
	net_rx_action

On Thu, Mar 27, 2008 at 11:56:19AM +0100, Peter Zijlstra wrote:
> On Thu, 2008-03-27 at 02:18 -0700, Andrew Morton wrote:
...
> > I bet the net code is wrong and we missed it ;)

It looks like you are natural born winner! Congratulations!

> How about this:
> 
> <irqs disabled>
> 
>   netpoll_poll()
>     poll_napi()
>       spin_trylock(&napi->poll_lock)
>       poll_one_napi()
>         napi->poll() := sky2_poll()
>           napi_complete()
>             local_irq_disable()
>             local_irq_enable() <--- *BUG*

Yes! I missed it's unconditional here... Great catch!

On the other hand, still a question why lockdep doesn't see this
every day?

Jarek P.
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