linux-kernel - Re: [PATCH 2/5] perf: unwind: pass symbol source to libunwind

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Date:	Mon, 12 Oct 2015 21:35:08 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Rabin Vincent <rabin.vincent@...s.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rabin Vincent <rabinv@...s.com>
Subject: Re: [PATCH 2/5] perf: unwind: pass symbol source to libunwind

Hi Jiri,

On Mon, Oct 12, 2015 at 8:24 PM, Jiri Olsa <jolsa@...hat.com> wrote:
> On Sun, Sep 27, 2015 at 08:37:56PM +0200, Rabin Vincent wrote:
>> Even if --symfs is used to point to the debug binaries, we send in the
>> non-debug filenames to libunwind, which leads to libunwind not finding
>> the debug frame.  Fix this.
>>
>> Signed-off-by: Rabin Vincent <rabin.vincent@...s.com>
>
> cc-ing Namhyung on this one

It seems that the dso->symsrc_filename can be NULL and it's unsafe to
call dwarf_find_debug_frame() with the NULL pointer.  Other than that
looks good to me.

Thanks,
Namhyung


>> ---
>>  tools/perf/util/unwind-libunwind.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
>> index ef799dc..b93bf7f 100644
>> --- a/tools/perf/util/unwind-libunwind.c
>> +++ b/tools/perf/util/unwind-libunwind.c
>> @@ -363,7 +363,7 @@ find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
>>                       dso__data_put_fd(map->dso);
>>
>>               memset(&di, 0, sizeof(di));
>> -             if (dwarf_find_debug_frame(0, &di, ip, base, map->dso->name,
>> +             if (dwarf_find_debug_frame(0, &di, ip, base, map->dso->symsrc_filename,
>>                                          map->start, map->end))
>>                       return dwarf_search_unwind_table(as, ip, &di, pi,
>>                                                        need_unwind_info, arg);
>> --
>> 1.7.10.4
>>
>> --
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-- 
Thanks,
Namhyung
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