linux-kernel - Re: [PATCH Not-for-merge 40/40] perf tools: Disable thread refcount due to bug

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Message-ID: <20150518123026.GC15972@kernel.org>
Date:	Mon, 18 May 2015 09:30:26 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH Not-for-merge 40/40] perf tools: Disable thread refcount
 due to bug

Em Mon, May 18, 2015 at 09:21:31PM +0900, Namhyung Kim escreveu:
> On Sun, May 17, 2015 at 10:23:36PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Mon, May 18, 2015 at 09:30:55AM +0900, Namhyung Kim escreveu:
> > > This makes thread mg sharing test failed due to not decrement
> > > thread->refcnt on thread__put().

> > I fixed this one already:

> > https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/core&id=8b00f46951bed1edd9c5cb9d9adb62d28bbe7623

> > No?
 
> I meant that I added this patch not to segfault caused by the thread
> refcount, but as a side-effect it makes thread_mg_sharing test failed
> due to non-decremented refcount.
 
> As of 70923bd26c73 ("perf tools: Make flex/bison calls honour V=1")
> I can reproduce the segfault.

Ok, I'll investigate that report, looks like one more case where
longstanding bugs are exposed by work on multithreading.

- Arnaldo
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