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

From: Arnaldo Carvalho de Melo
Date: Mon Aug 03 2015 - 15:28:15 EST


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__);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/