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njsmith · Jan 12, 2022 · bb02d15 · bb02d15
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diff --git a/newsfragments/2209.bugfix.rst b/newsfragments/2209.bugfix.rst
@@ -0,0 +1,3 @@
+Fix a bug that could cause `Process.wait` to hang on Linux systems using pidfds, if
+another task were to access `Process.returncode` after the process exited but before
+``wait`` woke up
diff --git a/trio/tests/test_subprocess.py b/trio/tests/test_subprocess.py
@@ -572,6 +572,8 @@ async def test_for_leaking_fds():
     assert set(SyncPath("/dev/fd").iterdir()) == starting_fds
 
 
+# regression test for #2209
+@pytest.mark.skipif(not posix, reason="Regression test for Linux-only bug")
 async def test_subprocess_pidfd_unnotified():
     noticed_exit = None