linux-kernel - Re: [BUG] perf_event: crash in perf_output

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Date:	Mon, 10 May 2010 22:03:22 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, mingo@...e.hu,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	perfmon2-devel@...ts.sf.net
Subject: Re: [BUG] perf_event: crash in perf_output_begin

On Mon, May 10, 2010 at 5:52 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, 2010-05-10 at 17:33 +0200, Stephane Eranian wrote:
>> Hi,
>>
>> While testing 2.6.34-rc7 I ran into the following issue when
>> using BTS sampling on Intel Core. It seems like something
>> is not terminated properly. I am sampling BTS per-thread
>> on a test program, then hit CTRL-C, one second later my
>> machine crashes while running bash. Crash dump below:
>>
>> [  750.249109] general protection fault: 0000 [#1] SMP
>> [  750.249270] CPU 3
>> [  750.249270] Pid: 6132, comm: bash Not tainted 2.6.34-rc7-tip+ #46
>
> Can you try and reverting 4fd38e4595e2f6c9d27732c042a0e16b2753049c, I
> spend most of the day chasing that, and I can't say I'm much wiser.
>

It seems to avoid my problem. So that means with STATE_FREE, some code
path is exercised differently and there is leftover state that
generates spurious
interrupts, as if some event_sched_out() code was not executed.
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