#20326: GenericBackend: Fix doctest of add_linear_constraint_vector
-------------------------+----------------------------
Reporter: mkoeppe | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.2
Component: numerical | Keywords: lp
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
-------------------------+----------------------------
The doctest of `add_linear_constraint_vector` from generic_backend.pyx
(which is never run for any real backend!), when applied to COIN or GLPK
leads to segfaults:
{{{
sage: sage: coeffs = ([0, vector([1, 2])], [1, vector([2,
3])])
sage: sage: upper = vector([5, 5])
sage: sage: lower = vector([0, 0])
sage: sage: from sage.numerical.backends.generic_backend
import get_solver
sage: sage: p = get_solver(solver = "Coin")
# optional - cbc
sage: p.add_linear_constraint_vector(2, coeffs, lower, upper, 'foo')
------------------------------------------------------------------------
0 signals.so 0x0000000109df05c5 print_backtrace
+ 37
------------------------------------------------------------------------
Unhandled SIGSEGV: A segmentation fault occurred.
This probably occurred because a *compiled* module has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Python will now terminate.
------------------------------------------------------------------------
Segmentation fault: 11
$ sage
SageMath Version 7.2.beta0, Release Date: 2016-03-24
sage: sage: sage: coeffs = ([0, vector([1, 2])], [1,
vector([2, 3])])
sage: sage: sage: upper = vector([5, 5])
sage: sage: sage: lower = vector([0, 0])
sage: sage: sage: from sage.numerical.backends.generic_backend
import get_solver
sage: sage: sage: p = get_solver(solver = "Coin")
# optional - cbc
sage: p.add_linear_constraint_vector(2, coeffs, lower, upper)
------------------------------------------------------------------------
0 signals.so 0x0000000109c8a5c5 print_backtrace
+ 37
------------------------------------------------------------------------
Unhandled SIGSEGV: A segmentation fault occurred.
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/20326>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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