bpo-41568: Fix refleaks in zoneinfo subclasses - #21907
Merged
pablogsal merged 2 commits intoAug 17, 2020
Merged
Conversation
Copy link
Copy Markdown
Member
Sorry, something went wrong.
This was leaking a reference to the weak cache dictionary for every ZoneInfo subclass created.
The previous version of the code accidentally cleared the global ZONEINFO_STRONG_CACHE variable (and inducing `ZoneInfo` to create a new strong cache) on calls to a subclass's `clear_cache()`. This would not affect guaranteed behavior, but it's still not the right thing to do (and it caused reference leaks).
pablogsal
approved these changes
Aug 17, 2020
pablogsal
left a comment
Copy link
Copy Markdown
Member
There was a problem hiding this comment.
I can confirm that this works:
❯ ./python -m test test_zoneinfo -R : 0:00:00 load avg: 7.77 Run tests sequentially 0:00:00 load avg: 7.77 [1/1] test_zoneinfo beginning 9 repetitions 123456789 ......... == Tests result: SUCCESS == 1 test OK. Total duration: 10.0 sec Tests result: SUCCESS
and the fix LGTM
Sorry, something went wrong.
Copy link
Copy Markdown
Contributor
|
Thanks @pganssle for the PR, and @pablogsal for merging it 🌮🎉.. I'm working now to backport this PR to: 3.9. |
Sorry, something went wrong.
miss-islington
pushed a commit
to miss-islington/cpython
that referenced
this pull request
Aug 17, 2020
* Fix refleak in C module __init_subclass__ This was leaking a reference to the weak cache dictionary for every ZoneInfo subclass created. * Fix refleak in ZoneInfo subclass's clear_cache The previous version of the code accidentally cleared the global ZONEINFO_STRONG_CACHE variable (and inducing `ZoneInfo` to create a new strong cache) on calls to a subclass's `clear_cache()`. This would not affect guaranteed behavior, but it's still not the right thing to do (and it caused reference leaks). (cherry picked from commit c3dd7e4) Co-authored-by: Paul Ganssle <paul@ganssle.io>
Copy link
Copy Markdown
|
GH-21912 is a backport of this pull request to the 3.9 branch. |
Sorry, something went wrong.
miss-islington
added a commit
that referenced
this pull request
Aug 17, 2020
* Fix refleak in C module __init_subclass__ This was leaking a reference to the weak cache dictionary for every ZoneInfo subclass created. * Fix refleak in ZoneInfo subclass's clear_cache The previous version of the code accidentally cleared the global ZONEINFO_STRONG_CACHE variable (and inducing `ZoneInfo` to create a new strong cache) on calls to a subclass's `clear_cache()`. This would not affect guaranteed behavior, but it's still not the right thing to do (and it caused reference leaks). (cherry picked from commit c3dd7e4) Co-authored-by: Paul Ganssle <paul@ganssle.io>
shihai1991
pushed a commit
to shihai1991/cpython
that referenced
this pull request
Aug 20, 2020
* Fix refleak in C module __init_subclass__ This was leaking a reference to the weak cache dictionary for every ZoneInfo subclass created. * Fix refleak in ZoneInfo subclass's clear_cache The previous version of the code accidentally cleared the global ZONEINFO_STRONG_CACHE variable (and inducing `ZoneInfo` to create a new strong cache) on calls to a subclass's `clear_cache()`. This would not affect guaranteed behavior, but it's still not the right thing to do (and it caused reference leaks).
xzy3
pushed a commit
to xzy3/cpython
that referenced
this pull request
Oct 18, 2020
* Fix refleak in C module __init_subclass__ This was leaking a reference to the weak cache dictionary for every ZoneInfo subclass created. * Fix refleak in ZoneInfo subclass's clear_cache The previous version of the code accidentally cleared the global ZONEINFO_STRONG_CACHE variable (and inducing `ZoneInfo` to create a new strong cache) on calls to a subclass's `clear_cache()`. This would not affect guaranteed behavior, but it's still not the right thing to do (and it caused reference leaks).
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
There are two refleaks related to subclassing the C implementation of ZoneInfo:
This fixes both of these issues.
https://bugs.python.org/issue41568