[Cbc] Segfault dealing with infeasible lp

[Haroldo Gambini Santos]

Hi Forrest,

It seems that it still crashes in revision 2322:


Welcome to the CBC MILP Solver
Version: 2.9
Build Date: Jan  9 2017
Revision Number: 2322

command line - cbc infeasible.lp (default strategy 1)
cbc: ClpSimplex.cpp:550: int ClpSimplex::gutsOfSolution(double*, const 
double*, bool): Assertion `nonLinearCost_' failed.
Abortado (imagem do núcleo gravada)




Em 09/01/2017 16:21, John Forrest escreveu:
> Had already made a change in local copy of trunk (for a different 
> reason) which fixes error.
>
> Hopefully fixed in stable and trunk
>
> John Forrest
> On 09/01/17 16:25, Luís Borges de Oliveira wrote:
>> Hello,
>>
>> We've come across an infeasible lp that causes CBC to segfault:
>>
>>     Welcome to the CBC MILP Solver
>>     Version: 2.9
>>     Build Date: Jan  5 2017
>>     Revision Number: 2315
>>
>>     command line - Z:\siscog\sc-cbc\coin-or-cbc\build\bin\cbc.exe
>>     infeasible.lp (default strategy 1)
>>
>>     Program received signal SIGSEGV, Segmentation fault.
>>     0x0000000000737f80 in
>>     ClpNonLinearCost::checkInfeasibilities(double) ()
>>
>> An attempt to minimise the lp size made the problem go away, so here 
>> is the full lp: 
>> https://drive.google.com/open?id=0B4aZo5-t5mnHQUlFWU1BRHRMRDA (4.5 MB).
>>
>> In case it helps, the infeasibility stems from following constraints 
>> and binary variables:
>>
>>     cnd(R51,16): + a(R51,16,D141) + a(R51,17,D1093) + a(R51,19,D513) <= 2
>>     s_a(R51,16): + a(R51,16,D141) = 1
>>     s_a(R51,17): + a(R51,17,D1093) = 1
>>     s_a(R51,19): + a(R51,19,D513) = 1
>>
>>
>> Cheers,
>> Luís
>>
>>
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-- 
==================================================
Haroldo Gambini Santos
D.Sc, Computer Science
Universidade Federal de Ouro Preto
http://www.decom.ufop.br/haroldo/

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