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gh-103847: fix some asyncio subprocess cancellation bugs by kumaraditya303 · Pull Request #146571 · python/cpython · GitHub

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gh-103847: fix some asyncio subprocess cancellation bugs #146571

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Merged
kumaraditya303 merged 5 commits into from
Jul 21, 2026
Conversation 7 Commits 5 Checks 57 Files changed
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gh-103847: fix some asyncio subprocess cancellation bugs #146571

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f9a8fdd
fix some asyncio cancellation bugs
kumaraditya303 Mar 28, 2026
e4926af
fix resource warnings
kumaraditya303 Mar 28, 2026
2424a20
fix windows
kumaraditya303 Mar 28, 2026
1c40f5a
remove tests
kumaraditya303 Jul 21, 2026
8f81617
remove comment
kumaraditya303 Jul 21, 2026
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18 changes: 15 additions & 3 deletions Lib/asyncio/base_subprocess.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ def __init__(self, loop, protocol, args, shell,
self._proc = None
self._pid = None
self._returncode = None
self._exit_waiters = []
self._exit_waiters = set()
self._pending_calls = collections.deque()
self._pipes = {}
self._finished = False
Expand Down Expand Up @@ -211,6 +211,14 @@ async def _connect_pipes(self, waiter):
except (SystemExit, KeyboardInterrupt):
raise
except BaseException as exc:
# Close any pipes that were already connected before the
# error/cancellation to avoid leaking file descriptors.
for proto in self._pipes.values():
if proto is not None:
proto.pipe.close()
for raw_pipe in (proc.stdin, proc.stdout, proc.stderr):
if raw_pipe is not None:
raw_pipe.close()
if waiter is not None and not waiter.cancelled():
waiter.set_exception(exc)
else:
Expand Down Expand Up @@ -260,8 +268,12 @@ async def _wait(self):
return self._returncode

waiter = self._loop.create_future()
self._exit_waiters.append(waiter)
return await waiter
self._exit_waiters.add(waiter)
try:
return await waiter
finally:
if self._exit_waiters is not None:
self._exit_waiters.discard(waiter)

def _try_finish(self):
assert not self._finished
Expand Down
2 changes: 1 addition & 1 deletion Lib/asyncio/unix_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -213,7 +213,7 @@ async def _make_subprocess_transport(self, protocol, args, shell,
raise
except BaseException:
transp.close()
await transp._wait()
await tasks.shield(transp._wait())
raise

return transp
Expand Down
2 changes: 1 addition & 1 deletion Lib/asyncio/windows_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -406,7 +406,7 @@ async def _make_subprocess_transport(self, protocol, args, shell,
raise
except BaseException:
transp.close()
await transp._wait()
await tasks.shield(transp._wait())
raise

return transp
Expand Down
5 changes: 1 addition & 4 deletions Lib/test/test_asyncio/test_subprocess.py
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Expand Up @@ -12,7 +12,7 @@
from asyncio import subprocess
from test.test_asyncio import utils as test_utils
from test import support
from test.support import os_helper, warnings_helper, gc_collect
from test.support import os_helper, gc_collect

if not support.has_subprocess_support:
raise unittest.SkipTest("test module requires subprocess")
Expand Down Expand Up @@ -1028,7 +1028,6 @@ async def main():

self.loop.run_until_complete(main())

@warnings_helper.ignore_warnings(category=ResourceWarning)
def test_subprocess_read_pipe_cancelled(self):
async def main():
loop = asyncio.get_running_loop()
Expand All @@ -1039,7 +1038,6 @@ async def main():
asyncio.run(main())
gc_collect()

@warnings_helper.ignore_warnings(category=ResourceWarning)
def test_subprocess_write_pipe_cancelled(self):
async def main():
loop = asyncio.get_running_loop()
Expand All @@ -1050,7 +1048,6 @@ async def main():
asyncio.run(main())
gc_collect()

@warnings_helper.ignore_warnings(category=ResourceWarning)
def test_subprocess_read_write_pipe_cancelled(self):
async def main():
loop = asyncio.get_running_loop()
Expand Down
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