linux-kernel - Re: rcu,sched: spinlock recursion on 3.5-rc2

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Message-ID: <20120612152521.GD2423@linux.vnet.ibm.com>
Date:	Tue, 12 Jun 2012 08:25:21 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <levinsasha928@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: rcu,sched: spinlock recursion on 3.5-rc2

On Tue, Jun 12, 2012 at 05:20:10PM +0200, Thomas Gleixner wrote:
> On Tue, 12 Jun 2012, Peter Zijlstra wrote:
> 
> > On Tue, 2012-06-12 at 17:07 +0200, Thomas Gleixner wrote:
> > > Hmm, not sure. The deadlock was not triggered in switch_to. It was
> > > just at the beginning of __schedule()
> > > 
> > > 
> > How can you tell? switch_to() is a macro not a function, it won't ever
> > show up on a stack-trace.. but I think you meant context_switch() but
> > that typically gets inlined, similar problem.
> 
> Bah, I misread the trace and the rcu code. :(
> 
> So, yes the revert should solve the problem. Looks like I need more
> coffee, not Paul :)

Well, given that the commit that I reverted was my own, I definitely
needed more of something or another...  :-)

							Thanx, Paul

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