gh-70560: gh-74389: subprocess.Popen.communicate() now ignores stdin.flush error when closed

Author: gpshead

Lib/subprocess.py

@@ -2075,8 +2075,12 @@ def _communicate(self, input, endtime, orig_timeout):
                 # been writing to .stdin in an uncontrolled fashion.
                 try:
                     self.stdin.flush()
-                except BrokenPipeError:
+                except (BrokenPipeError, ValueError):
                     pass  # communicate() must ignore BrokenPipeError.
+                except ValueError:
+                    # ignore ValueError: I/O operation on closed file.
+                    if not self.stdin.closed:
+                        raise
                 if not input:
                     try:
                         self.stdin.close()