On Mon, Aug 03, 2015 at 04:27:59PM -0300, Arnaldo Carvalho de Melo wrote:
> 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__);
yep, works nicely
thanks,
jirka
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