Fix waiter cancellation in asyncio.Lock (#1031) (#2037)

Avoid a deadlock when the waiter who is about to take the lock is
cancelled

Issue #27585

1 files changed, 3 insertions, 0 deletions

diff --git a/Misc/NEWS b/Misc/NEWS
index 580f579..0342c71 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -49,6 +49,9 @@ Core and Builtins
 Library
 -------
 
+- bpo-27585: Fix waiter cancellation in asyncio.Lock.
+  Patch by Mathieu Sornay.
+
 - bpo-30418: On Windows, subprocess.Popen.communicate() now also ignore EINVAL
   on stdin.write() if the child process is still running but closed the pipe.