linux-kernel - [PATCH perf/core 15/22] perf: Fix map_groups_

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Date:	Wed, 09 Dec 2015 11:11:20 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH perf/core 15/22] perf: Fix map_groups__clone to put cloned
 map

Fix map_groups__clone to put cloned map after
inserting it to the map_groups.

Refcnt debugger shows:
  ----
  ==== [0] ====
  Unreclaimed map: 0x2a27ee0
  Refcount +1 => 1 at
    ./perf(map_groups__clone+0x8d) [0x4bb7ed]
    ./perf(thread__fork+0xbe) [0x4c1f9e]
    ./perf(machine__process_fork_event+0x216) [0x4b79a6]
    ./perf(perf_event__synthesize_threads+0x38b) [0x48135b]
    ./perf(cmd_top+0xdc6) [0x43cb76]
    ./perf() [0x477223]
    ./perf(main+0x617) [0x422077]
    /lib64/libc.so.6(__libc_start_main+0xf0) [0x7ff806af8fe0]
    ./perf() [0x4221ed]
  Refcount +1 => 2 at
    ./perf(map_groups__clone+0x128) [0x4bb888]
    ./perf(thread__fork+0xbe) [0x4c1f9e]
    ./perf(machine__process_fork_event+0x216) [0x4b79a6]
    ./perf(perf_event__synthesize_threads+0x38b) [0x48135b]
    ./perf(cmd_top+0xdc6) [0x43cb76]
    ./perf() [0x477223]
    ./perf(main+0x617) [0x422077]
    /lib64/libc.so.6(__libc_start_main+0xf0) [0x7ff806af8fe0]
    ./perf() [0x4221ed]
  Refcount -1 => 1 at
    ./perf(map_groups__exit+0x87) [0x4ba757]
    ./perf(map_groups__put+0x68) [0x4ba9a8]
    ./perf(thread__put+0x8b) [0x4c1aeb]
    ./perf(machine__delete_threads+0x81) [0x4b48f1]
    ./perf(perf_session__delete+0x4f) [0x4be63f]
    ./perf(cmd_top+0x1094) [0x43ce44]
    ./perf() [0x477223]
    ./perf(main+0x617) [0x422077]
    /lib64/libc.so.6(__libc_start_main+0xf0) [0x7ff806af8fe0]
    ./perf() [0x4221ed]
  ----

This shows map_groups__clone get the map twice
and put it when map_groups__exit.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
---
 tools/perf/util/map.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 7859216..03b7297 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -744,6 +744,7 @@ int map_groups__clone(struct map_groups *mg,
 		if (new == NULL)
 			goto out_unlock;
 		map_groups__insert(mg, new);
+		map__put(new);
 	}
 
 	err = 0;

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