From 4a02543cf97e8cbf9293741379f977b85531e4c2 Mon Sep 17 00:00:00 2001
From: Andrew Svetlov <andrew.svetlov@gmail.com>
Date: Thu, 21 Dec 2017 17:06:46 +0200
Subject: [PATCH] bpo-26133: Dont unsubscribe signals in UNIX even loop on
 interpreter shutdown (#4956)

---
 Lib/asyncio/unix_events.py                             | 10 ++++++++--
 .../Library/2017-12-21-11-08-42.bpo-26133.mt81QV.rst   |  1 +
 2 files changed, 9 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2017-12-21-11-08-42.bpo-26133.mt81QV.rst

diff --git a/Lib/asyncio/unix_events.py b/Lib/asyncio/unix_events.py
index 69c719c3239..ec767f57d3a 100644
--- a/Lib/asyncio/unix_events.py
+++ b/Lib/asyncio/unix_events.py
@@ -51,8 +51,14 @@ def __init__(self, selector=None):
 
     def close(self):
         super().close()
-        for sig in list(self._signal_handlers):
-            self.remove_signal_handler(sig)
+        if not sys.is_finalizing():
+            for sig in list(self._signal_handlers):
+                self.remove_signal_handler(sig)
+        else:
+            warinigs.warn(f"Closing the loop {self!r} on interpreter shutdown "
+                          f"stage, signal unsubsription is disabled",
+                          ResourceWarning,
+                          source=self)
 
     def _process_self_data(self, data):
         for signum in data:
diff --git a/Misc/NEWS.d/next/Library/2017-12-21-11-08-42.bpo-26133.mt81QV.rst b/Misc/NEWS.d/next/Library/2017-12-21-11-08-42.bpo-26133.mt81QV.rst
new file mode 100644
index 00000000000..0653d1960e5
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2017-12-21-11-08-42.bpo-26133.mt81QV.rst
@@ -0,0 +1 @@
+Don't unsubscribe signals in asyncio UNIX event loop on interpreter shutdown.