linux-kernel - Re: rb tree hrtimer lockup bug (found by perf

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Message-ID: <alpine.DEB.2.02.1403201609540.18573@ionos.tec.linutronix.de>
Date:	Thu, 20 Mar 2014 16:12:21 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Vince Weaver <vincent.weaver@...ne.edu>
cc:	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: rb tree hrtimer lockup bug (found by perf_fuzzer)

On Thu, 20 Mar 2014, Vince Weaver wrote:

> On Thu, 20 Mar 2014, Thomas Gleixner wrote:
> > Find a more brute force method to get this decoded below. Full patch
> > this time, please zap the old one. That should spill out the recent
> > debug object calls and we can just hope, that we get enough history to
> > find this horror.
> 
> The patch didn't compile, as "addr" was not known.  I guessed and
> changed it to "oaddr", but if that's not what you meant then the
> trace results might be useless.

Yeah, it causes the explosion in the debug object code. This should
have been:

+                       trace_printk("Tracking Object free: %s %p %pS\n",
+                                    descr->name, obj->object, obj->hint);

 
Sorry, -ENOTENOUGHCOFFEE to switch on DEBUG_OBJECTS_FREE=y before
compile testing.

Thanks,

	tglx
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