linux-kernel - Re: [PATCH 11/18] perf script: Switch from perf.data's kallsyms to perf's symbol resolver

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Message-ID: <20150803192759.GD5498@kernel.org>
Date:	Mon, 3 Aug 2015 16:27:59 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 11/18] perf script: Switch from perf.data's kallsyms to
 perf's symbol resolver

Em Mon, Aug 03, 2015 at 04:00:09PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Aug 03, 2015 at 07:41:13PM +0200, Jiri Olsa escreveu:
> >     Missing separate debuginfos, use: dnf debuginfo-install glibc-2.21-7.fc22.x86_64
> >     [Thread debugging using libthread_db enabled]
> >     Using host libthread_db library "/lib64/libthread_db.so.1".
> >     Detaching after fork from child process 11230.
> >      
> >     Program received signal SIGSEGV, Segmentation fault.
> >     0x00000000004eeace in pevent_set_function_resolver (pevent=0x0, func=0x4a3197 <machine__resolve_kernel_addr>, priv=0x18e1f48) at event-parse.c:464
> >     464             free(pevent->func_resolver);
> >     Missing separate debuginfos, use: dnf debuginfo-install audit-libs-2.4.3-1.fc22.x86_64 bzip2-libs-1.0.6-14.fc22.x86_64 elfutils-libelf-0.163-1.fc22.x86_64 elfutils-libs-0.163-1.fc22.x86_64 libunwind-1.1-10.fc22.x86_64 nss-softokn-freebl-3.19.2-1.0.fc22.x86_64 numactl-libs-2.0.10-2.fc22.x86_64 perl-libs-5.20.2-326.fc22.x86_64 python-libs-2.7.10-4.fc22.x86_64 slang-2.3.0-2.fc22.x86_64 xz-libs-5.2.0-2.fc22.x86_64 zlib-1.2.8-7.fc22.x86_64
> >     (gdb)
> 
> > I think 'session->tevent.pevent' gets initialized only for tracepoint, right?
> 
> Reproduced, checking.

Yeah, I think we only need to set libtraceevent's function resolver if
there are tracepoints, i.e. if libtraceevent is being used. Following
patch should be enough, right?

- Arnaldo

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index bd31380122f9..7912feb9a024 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1861,7 +1861,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 	else
 		symbol_conf.use_callchain = false;
 
-	if (pevent_set_function_resolver(session->tevent.pevent,
+	if (session->tevent.pevent &&
+	    pevent_set_function_resolver(session->tevent.pevent,
 					 machine__resolve_kernel_addr,
 					 &session->machines.host) < 0) {
 		pr_err("%s: failed to set libtraceevent function resolver\n", __func__);
--
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