linux-kernel - Re: rcu: BUG: spinlock recursion on CPU#3, trinity-child19/5970

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Message-ID: <1341225139.23484.4.camel@twins>
Date:	Mon, 02 Jul 2012 12:32:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	paulmck@...ux.vnet.ibm.com, Dave Jones <davej@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: rcu: BUG: spinlock recursion on CPU#3, trinity-child19/5970

On Fri, 2012-06-29 at 23:40 +0200, Sasha Levin wrote:
> 
> The bad news are that what you saw was a lockdep enabled run
> (CONFIG_PROVE_RCU is enabled, and lockdep was enabled). There were no
> lockdep warnings at any point while reproducing it. 

rcu_switch_from() -> rcu_preempt_note_context_switch() is called _after_
the lockdep context switch annotation. Therefore lockdep things the prev
task isn't holding any locks anymore.


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