#15303: Coercion discovery fails to be transitive
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Reporter: nbruin | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.13
Component: coercion | Resolution:
Keywords: | Merged in:
Authors: Simon King | Reviewers:
Report Upstream: N/A | Work issues: Crash in permgroup.py
Branch: | Commit:
u/SimonKing/ticket/15303 | 807550bbc45e9872ac365fc98b817ccd5bcfbb95
Dependencies: #14711, #15329, | Stopgaps:
#15331 |
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Comment (by SimonKing):
Replying to [comment:92 SimonKing]:
> `PyDict_DelItem` is mentioned as well. Smells like problems with a
`WeakValueDictionary` such that the callback of a garbage collected value
uses a key that is in the process of being garbage collected, too, and
thus comparison of the key (which is needed to remove the item from the
dictionary) fails.
Compare #13394
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Ticket URL: <http://trac.sagemath.org/ticket/15303#comment:93>
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