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Date: Thu, 12 Sep 2013 11:51:34 -0700
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Subject: Re: [GIT PULL] perf fixes
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>
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On Thu, Sep 12, 2013 at 11:10 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> But at least the "make install" problem is repeatable, though.

And now this new problem is repeatable too:

  # On a fully built kernel tree
  perf record -g -e cycles:pp make -j

results in

  [ perf record: Woken up 27 times to write data ]
  [ perf record: Captured and wrote 7.980 MB perf.data (~348659 samples) ]
  0x1b4e0 [0]: failed to process type: -1970637019

where that number changes randomly, ie I get

  0x28dc58 [0]: failed to process type: 99257493
  0x4100 [0]: failed to process type: -1144359783
  0x29050 [0]: failed to process type: -972156963
  ..

looks like perhaps some uninitialized variable somewhere?

Recording performance profiles of other (simpler?) loads still seems
to work. So it's something about that "make -j" that makes it crap out
(note that the tree is fully built, so not a lot actually gets *done*,
and the thing only takes a few seconds)

               Linus