#14471: Category refinement sometimes changes the hash of parents
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Reporter: vbraun | Owner: rlm
Type: defect | Status: positive_review
Priority: critical | Milestone: sage-5.12
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: Volker Braun | Reviewers: Simon King
Report Upstream: N/A | Work issues:
Branch: | Dependencies:
Stopgaps: |
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Changes (by vbraun):
* status: needs_work => positive_review
Old description:
> Some objects with dynamical classes use `hash(self.__class__)`. Since
> this is not an invariant of dynamical classes bad things will happen.
>
> One such instance is that, under some circumstances, a
> !WeakValueDictionary remove callback is being called but cannot find the
> object in the dictionary since the hash changed.
>
> __Apply__
>
> - [attachment:trac_14471_dynamic_class_hash.patch]
> - [attachment:trac_14471-review.patch]
New description:
Some objects with dynamical classes use `hash(self.__class__)`. Since this
is not an invariant of dynamical classes bad things will happen.
One such instance is that, under some circumstances, a
!WeakValueDictionary remove callback is being called but cannot find the
object in the dictionary since the hash changed.
__Apply__
- [attachment:trac_14471_dynamic_class_hash.patch]
- [attachment:trac_14471-review.patch]
- [attachment:trac_14471-pdf-fix.patch]
--
Comment:
Fixed.
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Ticket URL: <http://trac.sagemath.org/ticket/14471#comment:38>
Sage <http://www.sagemath.org>
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