[Cbc] Assertion `feasible' failed in small MIP

[Haroldo Gambini Santos]

Hi,

I've got this small MIP:
http://www.decom.ufop.br/haroldo/files/layer2.mps

Where CBC (current trunk, revision 2070) fails:
Cbc0038I Full problem 185 rows 111 columns, reduced to 77 rows 38 columns
*cbc: CbcModel.cpp:16111: int CbcModel::doOneNode(CbcModel*, CbcNode*&, 
CbcNode*&): Assertion `feasible' failed.*

Here goes the stack trace:
(gdb) backtrace
#0  0x00007f48bdb7cbb9 in __GI_raise (sig=sig at entry=6)
     at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007f48bdb7ffc8 in __GI_abort () at abort.c:89
#2  0x00007f48bdb75a76 in __assert_fail_base (
     fmt=0x7f48bdcc7370 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",
     assertion=assertion at entry=0x7f48bffafa56 "feasible",
     file=file at entry=0x7f48bffac50e "CbcModel.cpp", line=line at entry=16111,
     function=function at entry=0x7f48bffaf080 
<CbcModel::doOneNode(CbcModel*, CbcNode*&, 
CbcNode*&)::__PRETTY_FUNCTION__> "int CbcModel::doOneNode(CbcModel*, 
CbcNode*&, CbcNode*&)") at assert.c:92
#3  0x00007f48bdb75b22 in __GI___assert_fail (assertion=0x7f48bffafa56 
"feasible",
     file=0x7f48bffac50e "CbcModel.cpp", line=16111,
     function=0x7f48bffaf080 <CbcModel::doOneNode(CbcModel*, CbcNode*&, 
CbcNode*&)::__PRETTY_FUNCTION__> "int CbcModel::doOneNode(CbcModel*, 
CbcNode*&, CbcNode*&)") at assert.c:101
#4  0x00007f48bff75ad3 in CbcModel::doOneNode (this=this at entry=0x9c7330,
     baseModel=baseModel at entry=0x9c7330, node=@0x7fffdc20bd30: 0xe8e6d0,
     newNode=@0x7fffdc20ba50: 0x0) at CbcModel.cpp:16111
#5  0x00007f48bff7ef08 in CbcModel::branchAndBound 
(this=this at entry=0x9c7330,
     doStatistics=doStatistics at entry=0) at CbcModel.cpp:4581
#6  0x00007f48c0274c79 in CbcMain1 (argc=argc at entry=5, 
argv=argv at entry=0x7fffdc213168,
     model=..., callBack=callBack at entry=0x7f48c0252787 
<dummyCallBack(CbcModel*, int)>,
     parameterData=...) at CbcSolver.cpp:6666
#7  0x00007f48c0287018 in CbcMain1 (argc=argc at entry=5, 
argv=argv at entry=0x7fffdc213168,
     model=..., callBack=callBack at entry=0x7f48c0252787 
<dummyCallBack(CbcModel*, int)>)
     at CbcSolver.cpp:1295
#8  0x00007f48c028702d in CbcMain1 (argc=argc at entry=5, 
argv=argv at entry=0x7fffdc213168,
     model=...) at CbcSolver.cpp:1163
#9  0x0000000000400e4f in main (argc=5, argv=0x7fffdc213168) at 
CoinSolve.cpp:336



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

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