#715: Parents probably not reclaimed due to too much caching
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Reporter: robertwb | Owner: somebody
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.8
Component: coercion | Keywords: weak cache coercion
Work_issues: fix doctests | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #9138, #11900
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Comment(by SimonKing):
I think I made a progress: I found that the vector space that is part of
the crash is ''not unique''! So, the `VectorMatrixAction` is defined for a
vector space that is equal to but not identical with the vector space it
is acting on!
The natural solution is to try and find out why the vector space is not
unique. Vector spaces should be created using the `VectorSpace`
constructor, that relies on a `UniqueFactory`. But apparently some very
old code is constructing a vector space directly - it wouldn't be the
first time that this is causing trouble.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/715#comment:54>
Sage <http://www.sagemath.org>
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