gh-110395: invalidate open kqueues after fork#110517
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gpshead merged 3 commits intopython:mainfrom Nov 4, 2023
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Make the child process _always_ exit even on test failure.
gpshead
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Nov 3, 2023
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I double checked the tp_dealloc and tp_finalize stuff and gave this another look. it's good, thanks! |
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Thanks for the review! CI failure looks spurious and unrelated to this change. Anything else I have to do? |
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test_asyncio test_unhandled_exceptions() failed on Windows x86: it's a known bug, fixed in the main branch. I re-run the job. If it fails too often, you can consider to rebase your PR on the main branch to get my test_unhandled_exceptions() fix. |
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Sorry, @sorcio and @gpshead, I could not cleanly backport this to |
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GH-111745 is a backport of this pull request to the 3.12 branch. |
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…1745) * [3.12] gh-110395: invalidate open kqueues after fork (GH-110517) Invalidate open select.kqueue instances after fork as the fd will be invalid in the child. (cherry picked from commit a6c1c04) Co-authored-by: Davide Rizzo <sorcio@gmail.com> * move assert to after the child dying this is in `main` via https://github.com/python/cpython/pull/111816/files
aisk
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Invalidate open select.kqueue instances after fork as the fd will be invalid in the child.
Glyphack
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Sep 2, 2024
Invalidate open select.kqueue instances after fork as the fd will be invalid in the child.
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select.kqueueobjects with an open fd in a linked list, so they can be invalidated after fork. The invalidation happens throughposix.register_at_fork()for lack of a better/safer idea.This PR does some extra allocations, but the number of kqueues you'll open in a program is normally very small, and otherwise it's very lightweight (tracking is only involved at open/close/fork).
I thought of different approaches but I'm not convinced:
.detach()method to invalidate the object without closing the fd. Leaves the burden of correct cleanup to users.close()on object destructor. Might make sense if combined with a check on pid at creation/destruction time. But still leaves some burden to users.