linux-kernel - Re: perf: perf sched lat segfault

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Date:	Tue, 08 Oct 2013 12:14:12 +0200
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: perf: perf sched lat segfault - bisected

On Tue, 2013-10-08 at 11:23 +0200, Stephane Eranian wrote: 
> On Tue, Oct 8, 2013 at 10:41 AM, Mike Galbraith <bitbucket@...ine.de> wrote:
> > Box: Q6600
> >
> > Reproducer:
> > perf sched record -- sleep 1
> > perf sched lat (boom)
> >
> I don't understand the test case here.
> If I do this, perf sched lat complains of no trace records
> and no kernel crash. Could you provide the full cmdline?

Hm.  That was it, just like so.

marge:/usr/local/src/kernel/linux-3.x.git/tools/perf # ./perf sched record -- sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.763 MB perf.data (~33348 samples) ]
marge:/usr/local/src/kernel/linux-3.x.git/tools/perf # ./perf sched lat
Segmentation fault
marge:/usr/local/src/kernel/linux-3.x.git/tools/perf #

	-Mike

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