From 77980a7b53e762bff7c901b4baa243dca2e03240 Mon Sep 17 00:00:00 2001
From: Megan Marsh <megan@hashicorp.com>
Date: Wed, 12 Sep 2018 10:53:15 -0700
Subject: [PATCH] fix progress bar mutex

---
 packer/progressbar.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packer/progressbar.go b/packer/progressbar.go
index e2b229d07..fc8f9e1ef 100644
--- a/packer/progressbar.go
+++ b/packer/progressbar.go
@@ -69,6 +69,7 @@ func (spb *StackableProgressBar) prefix() {
 
 func (spb *StackableProgressBar) Finish() {
 	spb.mtx.Lock()
+	defer spb.mtx.Unlock()
 
 	spb.items--
 	if spb.items == 0 {
@@ -80,7 +81,6 @@ func (spb *StackableProgressBar) Finish() {
 		return
 	}
 	spb.prefix()
-	spb.mtx.Unlock()
 }
 
 // BasicProgressBar is packer's basic progress bar.