From e5906f7ed5aae45ba39f1f0b1a17382a3fade2c9 Mon Sep 17 00:00:00 2001
From: Alexander Morozov <lk4d4@docker.com>
Date: Mon, 29 Feb 2016 08:50:42 -0800
Subject: [PATCH] Fix race between Apply and GetStats

Signed-off-by: Alexander Morozov <lk4d4@docker.com>
---
 libcontainer/cgroups/fs/apply_raw.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libcontainer/cgroups/fs/apply_raw.go b/libcontainer/cgroups/fs/apply_raw.go
index 758d1196..6def4ea5 100644
--- a/libcontainer/cgroups/fs/apply_raw.go
+++ b/libcontainer/cgroups/fs/apply_raw.go
@@ -130,6 +130,8 @@ func (m *Manager) Apply(pid int) (err error) {
 		return cgroups.EnterPid(m.Paths, pid)
 	}
 
+	m.mu.Lock()
+	defer m.mu.Unlock()
 	paths := make(map[string]string)
 	for _, sys := range subsystems {
 		if err := sys.Apply(d); err != nil {