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gh-113009: Fix multiprocessing Process.terminate() on Windows (#113128)

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On Windows, Process.terminate() no longer sets the returncode
attribute to always call WaitForSingleObject() in Process.wait().
Previously, sometimes the process was still running after
TerminateProcess() even if GetExitCodeProcess() is not STILL_ACTIVE.
This commit is contained in:
Victor Stinner 2023-12-15 15:57:49 +01:00 • committed by GitHub
parent d1a2adfb08
commit 4026ad5b2c
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2 changed files with 34 additions and 23 deletions
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16
Lib/multiprocessing/popen_spawn_win32.py
View file

@ -101,7 +101,9 @@ def duplicate_for_child(self, handle):
return reduction.duplicate(handle, self.sentinel) return reduction.duplicate(handle, self.sentinel)
def wait(self, timeout=None): def wait(self, timeout=None):
if self.returncode is None: if self.returncode is not None:
return self.returncode
if timeout is None: if timeout is None:
msecs = _winapi.INFINITE msecs = _winapi.INFINITE
else: else:
@ -120,7 +122,9 @@ def poll(self):
return self.wait(timeout=0) return self.wait(timeout=0)
def terminate(self): def terminate(self):
if self.returncode is None: if self.returncode is not None:
return
try: try:
_winapi.TerminateProcess(int(self._handle), TERMINATE) _winapi.TerminateProcess(int(self._handle), TERMINATE)
except PermissionError: except PermissionError:
@ -129,9 +133,11 @@ def terminate(self):
code = _winapi.GetExitCodeProcess(int(self._handle)) code = _winapi.GetExitCodeProcess(int(self._handle))
if code == _winapi.STILL_ACTIVE: if code == _winapi.STILL_ACTIVE:
raise raise
self.returncode = code
else: # gh-113009: Don't set self.returncode. Even if GetExitCodeProcess()
self.returncode = -signal.SIGTERM # returns an exit code different than STILL_ACTIVE, the process can
# still be running. Only set self.returncode once WaitForSingleObject()
# returns WAIT_OBJECT_0 in wait().
kill = terminate kill = terminate

5
Misc/NEWS.d/next/Windows/2023-12-14-19-00-29.gh-issue-113009.6LNdjz.rst Normal file
View file

@ -0,0 +1,5 @@
:mod:`multiprocessing`: On Windows, fix a race condition in
``Process.terminate()``: no longer set the ``returncode`` attribute to
always call ``WaitForSingleObject()`` in ``Process.wait()``. Previously,
sometimes the process was still running after ``TerminateProcess()`` even if
``GetExitCodeProcess()`` is not ``STILL_ACTIVE``. Patch by Victor Stinner.