#14711: Memleak when creating QuadraticField
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Reporter: jpflori | Owner:
Type: defect | davidloeffler
Priority: critical | Status: new
Component: number fields | Milestone: sage-5.13
Keywords: memleak, number field, | Resolution:
QuadraticField | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: u/SimonKing/ticket/14711 | Commit:
Dependencies: | Stopgaps:
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Comment (by SimonKing):
I just learnt that the codomain of an action coincides with the set that
is acted upon. But here, we have a
`sage.categories.action.PrecomposedAction`. So, it composes maps phi from
left and psi from right domain with an action alpha that knows about the
codomains of phi and psi only. And thus perhaps we have again the problem
of keeping "the middle parent" alive.
Namely, if the underlying set S of alpha is the codomain of psi, but psi
is weak, then neither psi nor alpha will keep S alive. But S is sometimes
not used as cache key for the precomposed action: Only the domains of psi
and phi appear in the key. Hence, I think I just need to add a strong
reference to the underlying set of alpha.
--
Ticket URL: <http://trac.sagemath.org/ticket/14711#comment:64>
Sage <http://www.sagemath.org>
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