[Cbc] Bug in CBC - CbcModel::doOneNode

[Haroldo Gambini Santos]

Hi Forrest,

CBC trunk (compiled with "-O1 -g" ) is exiting at one assertion when 
solving a small MIP:
*http://www.decom.ufop.br/haroldo/files/layer2.mps.gz*
(188 rows, 114 columns, 108 of which are binary)

The message is:
*cbc: CbcModel.cpp:15939: int CbcModel::doOneNode(CbcModel*, CbcNode*&, 
CbcNode*&): Assertion `feasible' failed.
*
and the stack trace is:

*#3  0x00007ffff5493ee2 in __GI___assert_fail (assertion=0x7ffff78c3acd 
"feasible", file=0x7ffff78c066e "CbcModel.cpp",
     line=15939,
     function=0x7ffff78c3140 <CbcModel::doOneNode(CbcModel*, CbcNode*&, 
CbcNode*&)::__PRETTY_FUNCTION__> "int CbcModel::doOneNode(CbcModel*, 
CbcNode*&, CbcNode*&)") at assert.c:101
#4  0x00007ffff788f473 in CbcModel::doOneNode (this=this at entry=0x64ee50, 
baseModel=baseModel at entry=0x64ee50, node=
     @0x7fffffff6bf0: 0xb7d530, newNode=@0x7fffffff6960: 0x0) at 
CbcModel.cpp:15939
#5  0x00007ffff7898473 in CbcModel::branchAndBound 
(this=this at entry=0x64ee50, doStatistics=doStatistics at entry=0)
     at CbcModel.cpp:4553
#6  0x00007ffff7b85e8d in CbcMain1 (argc=argc at entry=2, 
argv=argv at entry=0x7fffffffe008, model=...,
     callBack=callBack at entry=0x7ffff7b64f17 <dummyCallBack(CbcModel*, 
int)>, parameterData=...) at CbcSolver.cpp:6371
#7  0x00007ffff7b97bf8 in CbcMain1 (argc=argc at entry=2, 
argv=argv at entry=0x7fffffffe008, model=...,
     callBack=callBack at entry=0x7ffff7b64f17 <dummyCallBack(CbcModel*, 
int)>) at CbcSolver.cpp:1295
#8  0x00007ffff7b97c0d in CbcMain1 (argc=argc at entry=2, 
argv=argv at entry=0x7fffffffe008, model=...) at CbcSolver.cpp:1163
#9  0x0000000000400e4f in main (argc=2, argv=0x7fffffffe008) at 
CoinSolve.cpp:336
*
Cheers,

Haroldo

-- 
==================================================
Haroldo Gambini Santos
D.Sc, Computer Science
Universidade Federal de Ouro Preto
http://www.decom.ufop.br/haroldo/

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