[tip:perf/core] perf record: Fix race where process can disappear while reading its /proc/pid/tasks

[tip-bot for Arnaldo Carvalho de Melo <acme@redhat.com>]

Commit-ID:  7f3bedcc93f935631d2363f23de1cc80f04fdf3e
Gitweb:     http://git.kernel.org/tip/7f3bedcc93f935631d2363f23de1cc80f04fdf3e
Author:     Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Mon, 26 Oct 2009 19:23:17 -0200
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Tue, 27 Oct 2009 13:51:53 +0100

perf record: Fix race where process can disappear while reading its /proc/pid/tasks

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <1256592199-9608-1-git-send-email-acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 tools/perf/builtin-record.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index ac5ddff..9e1638c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -206,6 +206,7 @@ static pid_t pid_synthesize_comm_event(pid_t pid, int full)
 
 	fp = fopen(filename, "r");
 	if (fp == NULL) {
+out_race:	
 		/*
 		 * We raced with a task exiting - just return:
 		 */
@@ -247,6 +248,9 @@ static pid_t pid_synthesize_comm_event(pid_t pid, int full)
 	snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
 
 	tasks = opendir(filename);
+	if (tasks == NULL)
+		goto out_race;
+
 	while (!readdir_r(tasks, &dirent, &next) && next) {
 		char *end;
 		pid = strtol(dirent.d_name, &end, 10);