[PATCH 1/3] perf/sched: fix 'perf sched trace'

[Xiao Guangrong]

If we use 'perf sched trace', it will call symbol__init() again,
and can lead perf tool crash:

[root@localhost perf]# ./perf sched trace
*** glibc detected *** ./perf: free(): invalid next size (normal): 0x094c1898 ***
======= Backtrace: =========
/lib/libc.so.6[0xb7602404]
/lib/libc.so.6(cfree+0x96)[0xb76043b6]
./perf[0x80730fe]
./perf[0x8074c97]
./perf[0x805eb59]
./perf[0x80536fd]
./perf[0x804b618]
./perf[0x804bdc3]
/lib/libc.so.6(__libc_start_main+0xe5)[0xb75a9735]
./perf[0x804af81]
======= Memory map: ========
08048000-08158000 r-xp 00000000 fe:00 556831     /home/eric/....
08158000-08168000 rw-p 0010f000 fe:00 556831     /home/eric/...
08168000-085fe000 rw-p 00000000 00:00 0
094ab000-094cc000 rw-p 00000000 00:00 0          [heap]

Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>
---
 tools/perf/builtin-sched.c |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 45c46c7..7481ebd 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1888,13 +1888,18 @@ static int __cmd_record(int argc, const char **argv)
 
 int cmd_sched(int argc, const char **argv, const char *prefix __used)
 {
-	symbol__init(0);
-
 	argc = parse_options(argc, argv, sched_options, sched_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
 	if (!argc)
 		usage_with_options(sched_usage, sched_options);
 
+	/*
+	 * Aliased to 'perf trace' for now:
+	 */
+	if (!strcmp(argv[0], "trace"))
+		return cmd_trace(argc, argv, prefix);
+
+	symbol__init(0);
 	if (!strncmp(argv[0], "rec", 3)) {
 		return __cmd_record(argc, argv);
 	} else if (!strncmp(argv[0], "lat", 3)) {
@@ -1918,11 +1923,6 @@ int cmd_sched(int argc, const char **argv, const char *prefix __used)
 				usage_with_options(replay_usage, replay_options);
 		}
 		__cmd_replay();
-	} else if (!strcmp(argv[0], "trace")) {
-		/*
-		 * Aliased to 'perf trace' for now:
-		 */
-		return cmd_trace(argc, argv, prefix);
 	} else {
 		usage_with_options(sched_usage, sched_options);
 	}
-- 
1.6.1.2

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