Opened 7 years ago

Last modified 20 months ago

#19523 new defect

Adding constraints for the wrong MILP crashes Sage — at Version 3

Reported by: Jeroen Demeyer Owned by:
Priority: major Milestone: sage-7.3
Component: linear programming Keywords:
Cc: Yuan Zhou Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: #19525 Stopgaps:

Status badges

Description (last modified by Jeroen Demeyer)

sage: p = MixedIntegerLinearProgram(solver="glpk")
sage: q = MixedIntegerLinearProgram(solver="glpk")
sage: q.add_constraint(p[0] <= 1)
------------------------------------------------------------------------
Unhandled SIGABRT: An abort() occurred in Sage.
This probably occurred because a *compiled* component of Sage has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Sage will now terminate.
------------------------------------------------------------------------

With #19525, this improves to not crashing Sage:

sage: sage: p = MixedIntegerLinearProgram(solver="glpk")
sage: sage: q = MixedIntegerLinearProgram(solver="glpk")
sage: sage: q.add_constraint(p[0] <= 1)
---------------------------------------------------------------------------
GLPKError                                 Traceback (most recent call last)
...
GLPKError: glp_set_mat_row: i = 1; len = 1; invalid row length 
Error detected in file glpapi01.c at line 760

This ticket is to actually fix the error completely or give a better error message.

Change History (3)

comment:1 Changed 7 years ago by Jeroen Demeyer

Dependencies: #19525
Description: modified (diff)

comment:2 Changed 7 years ago by Nathann Cohen

Cc: Nathann Cohen added

comment:3 Changed 7 years ago by Jeroen Demeyer

Description: modified (diff)
Priority: criticalmajor
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