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As documented, the id() function can return the same value for distinct objects with non-overlapping lifetimes which can result in signals being sent to the wrong receivers if two distinct senders happen to have a colliding id() value. Since reproduction of the issue requires memory constrained circumstances where the same exact id() is reused for two senders of the same signal the test opt to simulate the collision by systematically making the same id for Sender instances. Note that we explicitly avoid keeping a strong reference to senders that cannot be weakly referenced as that would unexpectedly prevent them from being garbage collected. This means that id(sender) collisions could still occur for such objects but Django itself doesn't make use of them. Thanks Sjoerd Job Postmus for the reduced test case and Mariusz for the review. Co-authored-by: And Clover <and@doxdesk.com>
====== Django ====== Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. Thanks for checking it out. All documentation is in the "``docs``" directory and online at https://docs.djangoproject.com/en/stable/. If you're just getting started, here's how we recommend you read the docs: * First, read ``docs/intro/install.txt`` for instructions on installing Django. * Next, work through the tutorials in order (``docs/intro/tutorial01.txt``, ``docs/intro/tutorial02.txt``, etc.). * If you want to set up an actual deployment server, read ``docs/howto/deployment/index.txt`` for instructions. * You'll probably want to read through the topical guides (in ``docs/topics``) next; from there you can jump to the HOWTOs (in ``docs/howto``) for specific problems, and check out the reference (``docs/ref``) for gory details. * See ``docs/README`` for instructions on building an HTML version of the docs. Docs are updated rigorously. If you find any problems in the docs, or think they should be clarified in any way, please take 30 seconds to fill out a ticket here: https://code.djangoproject.com/newticket To get more help: * Join the `Django Discord community <https://chat.djangoproject.com>`_. * Join the community on the `Django Forum <https://forum.djangoproject.com/>`_. To contribute to Django: * Check out https://docs.djangoproject.com/en/dev/internals/contributing/ for information about getting involved. To run Django's test suite: * Follow the instructions in the "Unit tests" section of ``docs/internals/contributing/writing-code/unit-tests.txt``, published online at https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/#running-the-unit-tests Supporting the Development of Django ==================================== Django's development depends on your contributions. If you depend on Django, remember to support the Django Software Foundation: https://www.djangoproject.com/fundraising/