linux-kernel - Re: [PATCH] perf report: don't crash on invalid maps in `-g srcline` mode

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Date:   Fri, 12 May 2017 12:23:06 +0200
From:   Milian Wolff <milian.wolff@...b.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Yao Jin <yao.jin@...ux.intel.com>, kernel-team@....com
Subject: Re: [PATCH] perf report: don't crash on invalid maps in `-g srcline` mode

On Mittwoch, 10. Mai 2017 08:04:23 CEST Namhyung Kim wrote:
> On Tue, May 09, 2017 at 10:50:46PM +0200, Milian Wolff wrote:

<snip>

> > diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
> > index 9ab68682c6d0..295f0846fd84 100644
> > --- a/tools/perf/util/callchain.c
> > +++ b/tools/perf/util/callchain.c
> > @@ -642,13 +642,22 @@ static enum match_result match_chain_strings(const
> > char *left,> 
> >  static enum match_result match_chain_srcline(struct callchain_cursor_node
> >  *node,>  
> >  					     struct callchain_list *cnode)
> >  
> >  {
> > 
> > -	char *left = get_srcline(cnode->ms.map->dso,
> > -				 map__rip_2objdump(cnode->ms.map, cnode->ip),
> > -				 cnode->ms.sym, true, false);
> > -	char *right = get_srcline(node->map->dso,
> > -				  map__rip_2objdump(node->map, node->ip),
> > -				  node->sym, true, false);
> > -	enum match_result ret = match_chain_strings(left, right);
> > +	char *left = NULL;
> > +	char *right = NULL;
> > +	enum match_result ret = MATCH_ERROR;
> > +
> > +	if (!node->map || !cnode->ms.map)
> > +		return ret;
> 
> This makes it fall back to function/address matching below if one of
> srcline is not available.  But it'll just show many "??:0" entries
> IMHO.  Maybe we can use same logic in util/sort.c:cmp_null instead..

Yes, that could be done but I think it's not directly related to the patch/fix 
at hand. Would it be OK if I change this behavior in a separate patch?

Thanks
-- 
Milian Wolff | milian.wolff@...b.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
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