linux-kernel - Re: [PATCH 14/18] perf tools: Make vmlinux short name more like kallsyms short name

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Date:	Mon, 10 Nov 2014 16:29:34 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 14/18] perf tools: Make vmlinux short name more like
 kallsyms short name

On Mon, Nov 10, 2014 at 03:13:46PM +0900, Namhyung Kim wrote:

SNIP

> >> +			dso__set_short_name(dso, "[kernel.vmlinux]", false);
> >> +
> >
> > heya,
> > I've got attached segfault in perf script because of this,
> > if I revert it's ok..
> 
> Oops, sorry.  It seems somehow to fail to find a matching kernel dso
> from the build-id table..  anyway we need to access 'kernel' instead of
> 'dso' since it might be invalid at this time.
> 
> Could you please check below patch?
> 
> 
> From e28ec815465721b81669c47eb00d8307f4b424cd Mon Sep 17 00:00:00 2001
> From: Namhyung Kim <namhyung@...nel.org>
> Date: Mon, 10 Nov 2014 15:05:26 +0900
> Subject: [PATCH] perf tools: Fix segfault due to invalid kernel dso access
> 
> When processing kernel mmap event, it should access the 'kernel'
> variable as sometimes it cannot find a matching dso from build-id
> table so 'dso' might be invalid.
> 
> Reported-by: Jiri Olsa <jolsa@...hat.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

yep, works nicely now

Tested-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka
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