bpo-32734: Fix asyncio.Lock multiple acquire safety issue (GH-5466)

diff --git a/Misc/ACKS b/Misc/ACKS
index 3fdfa30..c5eadc5 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -602,6 +602,7 @@
 Stephen Hansen
 Barry Hantman
 Lynda Hardman
+Bar Harel
 Derek Harland
 Jason Harper
 David Harrigan
diff --git a/Misc/NEWS.d/next/Library/2018-02-01-01-34-47.bpo-32734.gCV9AD.rst b/Misc/NEWS.d/next/Library/2018-02-01-01-34-47.bpo-32734.gCV9AD.rst
new file mode 100644
index 0000000..14d4bbd
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-02-01-01-34-47.bpo-32734.gCV9AD.rst
@@ -0,0 +1,2 @@
+Fixed ``asyncio.Lock()`` safety issue which allowed acquiring and locking
+the same lock multiple times, without it being free. Patch by Bar Harel.