#18905: fix more leaks found in #18897
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Reporter: dimpase | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #18897 | Stopgaps:
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Comment (by SimonKing):
attachment:test2.png shows the result of
{{{
sage: K = GF(31)
sage: A = K.algebraic_closure()
sage: del A,K
sage: L = [c for c in gc.get_objects() if isinstance(c,
sage.rings.finite_rings.integer_mod.NativeIntStruct) and
len(c._get_table())==31]
sage: filter = lambda x: (x is not L) and (not isinstance(x,
sage.rings.finite_rings.integer_mod.IntegerMod_int))
sage:
objgraph.show_backrefs(L[0],filter=filter,filename="/home/king/Sage/work/memleak/test2.png")
Graph written to /tmp/objgraph-4qP1R3.dot (16 nodes)
Image generated as /home/king/Sage/work/memleak/test2.png
}}}
The picture somehow looks familiar: There is a coerce map involved, namely
!Int_to_IntegerMod. Coerce maps are supposed to have a weak reference to
the domain and a strong reference to the codomain. Since the domain of
!Int_to_IntegerMod presumably is the ring of integers and can't be
deallocated anyway, a strong reference to the codomain means trouble...
--
Ticket URL: <http://trac.sagemath.org/ticket/18905#comment:12>
Sage <http://www.sagemath.org>
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