[Coin-symphony] OsiSym crashing when deleting a solver

[Ted Ralphs]

Hi Kish,

We should be able to fix this. Can you submit a trouble ticket for it? I
think you had already reported another item or two on the list that did
not get fixed yet. Could you put those in as well? Thanks.

https://projects.coin-or.org/SYMPHONY/newticket

Cheers,

Ted

Kish Shen wrote:
> Hi,
> 
> I have been using SYMPHONY through OsiSymSolverInterface, with CLP as the linear solver.
> I am using Osi because the code can be used with other solvers (I have tested the code with
> Cbc/Clp).
> 
> I get a SIGABRT when I free the OsiSymSolverInterface after trying to solve a problem
> that changes the objective coeffs and resolving the problem. I get the following warnings 
> first:
> 
> sym_warm_solve(): SYMPHONY can not resolve for the
> obj coeff change when reduced cost fixing is on,for now!
> sym_get_obj_val(): There is no solution!
> sym_get_col_solution(): There is no solution!
> 
> and then later on, when the OsiSumSolverInterface is being deleted, the crash happens 
> when OsiSymSolverInterface::~OsiSymSolverInterface() calls sym_close_environment(),
> with the message:
> 
> *** glibc detected *** double free or corruption (fasttop): 0x08061ff0 ***
> 
> apparently in
> 
>    FREE(env->best_sol.xind);
> 
> in free_master_u() [in master_wrapper.c]
> 
> where *env->best_sol.xind is pointing to the location:
> 
> (gdb) p *env->best_sol.xind
> $1 = (int *) 0x8061ff0
> 
> Does this have any to do with there not being a solution? Is there anyway around this problem?
> 
> The SYMPHONY I am using is a tarball from 15 July 2006.
> 
> Thanks for any help in advance!
> 
> Cheers,
> 
> Kish
> 
> 
> 
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-- 
Dr. Ted Ralphs
Associate Professor
Industrial and Systems Engineering
Lehigh University
(610)758-4784
tkralphs at lehigh.edu
www.lehigh.edu/~tkr2