#35801: Signals are dispatched to receivers associated with dead senders
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Reporter: bobince | Owner: (none)
Type: Bug | Status: new
Component: Core (Other) | Version: 5.1
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Simon Charette):
> In my case this resulted in post-migrate hooks for the wrong apps being
occasionally called in migration tests that mutated INSTALLED_APPS causing
AppConfig senders to be re-created
Could you provide a minimal project demonstrating the issue in a non-
synthetic manner? Before we commit to a solution (which yours appear to be
correct from a quick look) we'd want to establish under which organic
conditions the problem can be reproduced.
The Django test suite has many instances of
`@override_settings(INSTALLED_APPS)` and doesn't run into this issue and
I'm not sure it's fair to expect Django to behave properly under memory
pressure circumstances that make `id` and therefore `hash` (as the default
implementation of `__hash__` is `id()` based) to return the same value for
two distinct objects.
I think a possible alternative solution could be to identify under which
organic circumstances this problem is likely to happen, document that
signal connected with a sender must be disconnected prior to the object
being garbage collected, and adjust the infringing cases within the
framework itself.
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Ticket URL: <https://code.djangoproject.com/ticket/35801#comment:5>
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