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Date: Fri, 10 May 2013 12:29:11 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Dave Hansen <dave@sr71.net>
Cc: Andi Kleen <ak@linux.intel.com>, LKML <linux-kernel@vger.kernel.org>,
        eranian@google.com
Subject: Re: NMIs induced by 'perf top' hogging all CPU time
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On Thu, May 09, 2013 at 04:29:16PM -0700, Dave Hansen wrote:
> If I boot a recent kernel (bb9055b) and run 'perf top' on my machine, it
> hangs.  It is 100% reproducible; it happens every single time.  If I'm
> lucky, I'll get some of the hardlockup detection messages on the console.

Are you implicitly saying it worked as expected on previous kernels?