#14471: Exception KeyError: in WeakValueDictionary remove ignored
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Reporter: vbraun | Owner: rlm
Type: defect | Status: new
Priority: major | Milestone: sage-5.10
Component: memleak | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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Under some circumstances the !WeakValueDictionary remove callback is being
called when the internal dictionary is in a bad state. The attached patch
to demonstrate the issue just calls `hasattr` from the displayhook, which
ends up generating weak references somewhere. The exact place for where
the exception occurs depends on the garbage collector, but I always do get
some unwanted exceptions with it.
{{{
sage -t devel/sage/sage/matrix/matrix0.pyx
Exception KeyError: (((<class 'sage.matrix.matrix_space.MatrixSpace'>,
Callable function ring with arguments (x, y), 2, 2, False), ()),) in
<function remove at 0x18d8758> ignored
**********************************************************************
File "devel/sage/sage/matrix/matrix0.pyx", line 3370, in
sage.matrix.matrix0.Matrix.is_hermitian
Failed example:
B.is_hermitian()
Expected:
True
Got:
Exception KeyError: (((<class 'sage.categories.algebras.Algebras'>,
Callable function ring with arguments (x, y)), ()),) in <function remove
at 0x18d8758> ignored
True
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14471>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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