[PATCH 1/3] perf tools: Protect reading thread's namespace

[Namhyung Kim]

It seems that the current code lacks holding the namespace lock in
thread__namespaces().  Otherwise it can see inconsistent results.

Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
 tools/perf/util/thread.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 403045a2bbea..b413ba5b9835 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -133,7 +133,7 @@ void thread__put(struct thread *thread)
        }
 }
 
-struct namespaces *thread__namespaces(const struct thread *thread)
+static struct namespaces *__thread__namespaces(const struct thread *thread)
 {
        if (list_empty(&thread->namespaces_list))
                return NULL;
@@ -141,10 +141,21 @@ struct namespaces *thread__namespaces(const struct thread 
*thread)
        return list_first_entry(&thread->namespaces_list, struct namespaces, 
list);
 }
 
+struct namespaces *thread__namespaces(const struct thread *thread)
+{
+       struct namespaces *ns;
+
+       down_read((struct rw_semaphore *)&thread->namespaces_lock);
+       ns = __thread__namespaces(thread);
+       up_read((struct rw_semaphore *)&thread->namespaces_lock);
+
+       return ns;
+}
+
 static int __thread__set_namespaces(struct thread *thread, u64 timestamp,
                                    struct namespaces_event *event)
 {
-       struct namespaces *new, *curr = thread__namespaces(thread);
+       struct namespaces *new, *curr = __thread__namespaces(thread);
 
        new = namespaces__new(event);
        if (!new)
-- 
2.21.0.1020.gf2820cf01a-goog