From fdccfe09f0b10776645fdb04a0783d6864c32b21 Mon Sep 17 00:00:00 2001
From: Yury Selivanov <yury@magic.io>
Date: Mon, 28 May 2018 17:10:20 -0400
Subject: bpo-33469: RuntimeError after closing loop that used run_in_executor
 (GH-7171)

---
 Lib/asyncio/futures.py | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'Lib/asyncio/futures.py')

diff --git a/Lib/asyncio/futures.py b/Lib/asyncio/futures.py
index 4a56f32c77..0e0e696a25 100644
--- a/Lib/asyncio/futures.py
+++ b/Lib/asyncio/futures.py
@@ -353,6 +353,9 @@ def _chain_future(source, destination):
                 source_loop.call_soon_threadsafe(source.cancel)
 
     def _call_set_state(source):
+        if (destination.cancelled() and
+                dest_loop is not None and dest_loop.is_closed()):
+            return
         if dest_loop is None or dest_loop is source_loop:
             _set_state(destination, source)
         else:
-- 
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