#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):
It reduces to
{{{
sage: SG4 = SymmetricGroupAlgebra(ZZ,4)
sage: SG4._introspect_coerce()['_coerce_from_list']
[Generic morphism:
From: Integer Ring
To: Symmetric group algebra of order 4 over Integer Ring,
Generic morphism:
From: Symmetric group algebra of order 3 over Integer Ring
To: Symmetric group algebra of order 4 over Integer Ring]
sage: phi, psi = _
sage: import gc
sage: gc.collect()
1062
sage: phi
Generic morphism:
From: Integer Ring
To: Symmetric group algebra of order 4 over Integer Ring
sage: psi
Traceback (most recent call last):
...
ValueError: This map is in an invalid state, domain or codomain have been
garbage collected
}}}
So, perhaps we need to keep stuff strong in the coerce_from_list after
all.
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Ticket URL: <http://trac.sagemath.org/ticket/14711#comment:79>
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