From 40a1fb0e2fdf1c0b287275bc85b981e226b1a79c Mon Sep 17 00:00:00 2001
From: Qiang Huang <h.huangqiang@huawei.com>
Date: Mon, 14 Aug 2017 15:18:59 +0800
Subject: [PATCH] Fix flaky test TestNotifyOnOOM

Fixes: #1228

It can be reproduced by applying this patch:
```diff
@@ -45,6 +46,7 @@ func registerMemoryEvent(cgDir string, evName string, arg string) (<-chan struct
        go func() {
                defer func() {
                        close(ch)
+                       <-time.After(1 * time.Second)
                        eventfd.Close()
                        evFile.Close()
                }()
```

We can close channel after fds were closed.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
---
 libcontainer/notify_linux.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libcontainer/notify_linux.go b/libcontainer/notify_linux.go
index 81587b9b1..47a06783d 100644
--- a/libcontainer/notify_linux.go
+++ b/libcontainer/notify_linux.go
@@ -44,9 +44,9 @@ func registerMemoryEvent(cgDir string, evName string, arg string) (<-chan struct
 	ch := make(chan struct{})
 	go func() {
 		defer func() {
-			close(ch)
 			eventfd.Close()
 			evFile.Close()
+			close(ch)
 		}()
 		buf := make([]byte, 8)
 		for {