linux-kernel - Re: lockdep warning on rt_mutex

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Message-ID: <20120818045908.GA7503@localhost>
Date:	Sat, 18 Aug 2012 12:59:08 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: lockdep warning on rt_mutex_lock()

On Fri, Aug 17, 2012 at 07:44:37AM -0700, Paul E. McKenney wrote:
> On Fri, Aug 17, 2012 at 10:02:40PM +0800, Fengguang Wu wrote:
> > On Fri, Aug 17, 2012 at 06:43:28AM -0700, Paul E. McKenney wrote:
> > > On Fri, Aug 17, 2012 at 06:06:35PM +0800, Fengguang Wu wrote:
> > > > Greetings,
> > > > 
> > > > FYI, a lockdep warning:
> > > 
> > > Certainly looks problematic!
> > > 
> > > Any hint as to what version of the kernel produced this splat?
> > > (Yes, lazy of me to ask, I know, but I am not seeing it in my testing.)
> > 
> > It happens on both 3.5.0 and 3.6-rc1. Will bisect (try older kernels) help?
> > Bisect is handy for me :)
> 
> Bisection would be very welcome!!!  ;-)

The bisect result is...

commit 9e571a82f0cb205a65a0ea41657f19f22b7fabb8
Author: Paul E. McKenney <paul.mckenney@...aro.org>
Date:   Thu Sep 30 21:26:52 2010 -0700

    rcu: add tracing for TINY_RCU and TINY_PREEMPT_RCU
    
    Add tracing for the tiny RCU implementations, including statistics on
    boosting in the case of TINY_PREEMPT_RCU and RCU_BOOST.
    
    Signed-off-by: Paul E. McKenney <paul.mckenney@...aro.org>
    Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Thanks,
Fengguang
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