#11588: copying a linear program crashes SAGE
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Reporter: john_perry | Owner: ncohen
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.2
Component: linear programming | Keywords: MixedIntegerLinearProgram,
copy
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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It would be useful to copy a linear program, so that one doesn't have to
recopy the constraints. Unfortunately, this crashes Sage, and pretty hard.
sage: eqs = MixedIntegerLinearProgram()
sage: eqs2 = copy(eqs)
sage: eqs2
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Unhandled SIGSEGV: A segmentation fault occurred in Sage.
This probably occurred because a *compiled* component
of Sage has a bug in it (typically accessing invalid memory)
and is not properly wrapped with sig_on(), sig_off().
You might want to run Sage under gdb with 'sage -gdb' to debug this.
Sage will now terminate (sorry).
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11588>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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