> ERROR: test_killed_child (test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest)

The patch below makes this test failure more likely:

diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
index 510e4b5aba..63518e55d9 100644
--- a/Lib/multiprocessing/connection.py
+++ b/Lib/multiprocessing/connection.py
@@ -370,6 +370,7 @@ class Connection(_ConnectionBase):
     def _send(self, buf, write=_write):
         remaining = len(buf)
         while True:
+            time.sleep(0.050)
             n = write(self._handle, buf)
             remaining -= n
             if remaining == 0: