[3.12] gh-106503: asyncio._SelectorSocketTransport: fix cyclic reference on close(). (GH-106504) (#106514)

miss-islington · pteromys · web-flow · commit 7e883d76c0a1 · 2023-07-07T12:08:22.000Z
gh-106503: asyncio._SelectorSocketTransport: fix cyclic reference on close(). (GH-106504) (cherry picked from commit 3e5ce79) Co-authored-by: Andrew Geng <pteromys@gmail.com>
diff --git a/Lib/asyncio/selector_events.py b/Lib/asyncio/selector_events.py
@@ -1202,6 +1202,7 @@ def _reset_empty_waiter(self):
 
     def close(self):
         self._read_ready_cb = None
+        self._write_ready = None
         super().close()
 
 
diff --git a/Misc/ACKS b/Misc/ACKS
@@ -615,6 +615,7 @@ Marius Gedminas
 Jan-Philip Gehrcke
 Thomas Gellekum
 Gabriel Genellina
+Andrew Geng
 Philip Georgi
 Christos Georgiou
 Elazar (אלעזר) Gershuni
diff --git a/Misc/NEWS.d/next/Library/2023-07-07-03-05-58.gh-issue-106503.ltfeiH.rst b/Misc/NEWS.d/next/Library/2023-07-07-03-05-58.gh-issue-106503.ltfeiH.rst
@@ -0,0 +1,2 @@
+Fix ref cycle in :class:`!asyncio._SelectorSocketTransport` by removing
+``_write_ready`` in ``close``.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fix ref cycle in :class:`!asyncio._SelectorSocketTransport` by removing
	`2`	+``_write_ready`` in ``close``.