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epollreactor: Handle ENOENT from epoll_ctl gracefully When epoll_ctl(EPOLL_CTL_MOD) is called on a file descriptor that is no longer registered with epoll, it returns ENOENT. This can happen due to fd reuse race conditions: 1. Old connection uses fd N, registered for writes in _writes set 2. Old connection closes, kernel removes fd N from epoll interest list 3. New connection accepted, kernel reuses fd N 4. startReading() -> addReader() -> _add() sees fd N still in _writes 5. Calls self._poller.modify(fd, flags) to add read events 6. modify() fails with ENOENT - fd N is not in epoll (old one was removed) Stack trace from buildbot: tcp.py:1431: transport = self.transport(...) tcp.py:834: self.startReading() abstract.py: self.reactor.addReader(self) epollreactor.py:117: self._add(...) epollreactor.py:103: self._poller.modify(fd, flags) FileNotFoundError: [Errno 2] No such file or directory The epoll(7) manpage documents: ENOENT: op was EPOLL_CTL_MOD or EPOLL_CTL_DEL, and fd is not registered with this epoll instance. Instead of raising an exception, clean up the internal tracking state and schedule connectionLost to properly notify the protocol layer. Fixes race condition observed in buildbot.

Mic92:epoll

12 hours ago

[pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci

Mic92:epoll

12 hours ago

epollreactor: Handle ENOENT from epoll_ctl gracefully When epoll_ctl(EPOLL_CTL_MOD) is called on a file descriptor that is no longer registered with epoll, it returns ENOENT. This can happen due to fd reuse race conditions: 1. Old connection uses fd N, registered for writes in _writes set 2. Old connection closes, kernel removes fd N from epoll interest list 3. New connection accepted, kernel reuses fd N 4. startReading() -> addReader() -> _add() sees fd N still in _writes 5. Calls self._poller.modify(fd, flags) to add read events 6. modify() fails with ENOENT - fd N is not in epoll (old one was removed) Stack trace from buildbot: tcp.py:1431: transport = self.transport(...) tcp.py:834: self.startReading() abstract.py: self.reactor.addReader(self) epollreactor.py:117: self._add(...) epollreactor.py:103: self._poller.modify(fd, flags) FileNotFoundError: [Errno 2] No such file or directory The epoll(7) manpage documents: ENOENT: op was EPOLL_CTL_MOD or EPOLL_CTL_DEL, and fd is not registered with this epoll instance. Instead of raising an exception, clean up the internal tracking state and schedule connectionLost to properly notify the protocol layer. Fixes race condition observed in buildbot.

Mic92:epoll

12 hours ago

Clean up test_usesGlobalInitFunction getargspec method was removed in Python 3.11 and was deprecated since Python 3.0 Also inspect has had the attribute 'signature' since Python 3.3 so the else statement is never run today on support Python versions.

gudnimg:_passedArgSpec-removal

20 days ago

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gudnimg:_passedArgSpec-removal

20 days ago

Drop Python 2 code to fix coverage gap in deprecate.py

gudnimg:python-pyupgrade-py39-plus

23 days ago

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gudnimg:python-pyupgrade-py39-plus

23 days ago

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gudnimg:python-pyupgrade-py39-plus

23 days ago

Active Branches

epollreactor: Handle ENOENT from epoll_ctl gracefully

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12 hours ago

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#12564 Remove `_passedArgSpec` method in `deprecate.py`

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20 days ago

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#12562 python: update type annotations for Python 3.9+ (1/1)

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23 days ago

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