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

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Message-ID: <alpine.DEB.2.02.1403181921010.18573@ionos.tec.linutronix.de>
Date:	Tue, 18 Mar 2014 19:21:56 +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 Tue, 18 Mar 2014, Vince Weaver wrote:

> 
> The perf_fuzzer can quickly cause a machine to lockup with an hrtimer 
> related rb tree related oops.  I've had a hard time debugging this in any 
> useful manner, but I can trigger it on both core2 and haswell test systems 
> on 3.14-rc7.
> 
> This involves making a large number of perf_event events of all types and 
> then forking a lot.

Can you enable debugobjects please? The should give us an hint what
corrupts the rbtree.

Thanks,

	tglx

 
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