[PATCH] perf: reset SIGTERM handler in workload child process

[David Ahern <dsahern@gmail.com>]

Jiri reported hanging perf tests on latest acme's perf/core and bisected
it to 87f303a9f:

[jolsa@krava2 perf]$ cat /proc/sys/kernel/perf_event_paranoid
1
[jolsa@krava2 perf]$ ./perf record -C 0 kill
Error:
You may not have permission to collect %sstats.
Consider tweaking /proc/sys/kernel/perf_event_paranoid:
 -1 - Not paranoid at all
  0 - Disallow raw tracepoint access for unpriv
  1 - Disallow cpu events for unpriv
  2 - Disallow kernel profiling for unpriv

Need to let default handling kickin for workload process.

Reported-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
---
 tools/perf/util/evlist.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index f7c7278..99b43dd 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -776,6 +776,8 @@ int perf_evlist__prepare_workload(struct perf_evlist *evlist,
 		if (pipe_output)
 			dup2(2, 1);
 
+		signal(SIGTERM, SIG_DFL);
+
 		close(child_ready_pipe[0]);
 		close(go_pipe[1]);
 		fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
-- 
1.7.10.1