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<p class=MsoNormal>The following small IP fails using the CbcMain1 interface. It
is a unique case, because all rows and cols are removed by presolver.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>http://coral.ie.lehigh.edu/~magh/tmp/subProb.n0.c0.p1.b0.lp<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>https://projects.coin-or.org/Cbc/ticket/79<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> CbcModel
cbc(*subprobSI);<o:p></o:p></p>
<p class=MsoNormal> CbcMain0(cbc);<o:p></o:p></p>
<p class=MsoNormal> const
char * argv[] = {"cbc","-solve","-quit"};<o:p></o:p></p>
<p class=MsoNormal> CbcMain1(3,
argv, cbc);<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Coin Cbc and Clp Solver version 1.2trunk, build Sep 9
2009<o:p></o:p></p>
<p class=MsoNormal>command line - cbc -solve -quit (default strategy 1)<o:p></o:p></p>
<p class=MsoNormal>Continuous objective value is 46.6667 - 0.00 seconds<o:p></o:p></p>
<p class=MsoNormal>Cgl0003I 20 fixed, 0 tightened bounds, 0 strengthened rows,
0 substitutions<o:p></o:p></p>
<p class=MsoNormal>Cgl0003I 5 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions<o:p></o:p></p>
<p class=MsoNormal>Cgl0003I 0 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions<o:p></o:p></p>
<p class=MsoNormal>Cgl0004I processed model has 0 rows, 0 columns (0 integer)
and 0 elements<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>gdb gives:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Program received signal SIGSEGV, Segmentation fault.<o:p></o:p></p>
<p class=MsoNormal>0x0000003ffa871f6b in free () from /lib64/libc.so.6<o:p></o:p></p>
<p class=MsoNormal>(gdb) where<o:p></o:p></p>
<p class=MsoNormal>#0 0x0000003ffa871f6b in free () from /lib64/libc.so.6<o:p></o:p></p>
<p class=MsoNormal>#1 0x000000000057bc41 in ~CbcRounding
(this=0x7fffec90c080)<o:p></o:p></p>
<p class=MsoNormal> at ../../../Cbc/src/CbcHeuristic.cpp:1552<o:p></o:p></p>
<p class=MsoNormal>#2 0x00000000004ae837 in doHeuristics
(model=0x1d1f3e00, type=1)<o:p></o:p></p>
<p class=MsoNormal> at ../../../Cbc/src/CbcSolver.cpp:3479<o:p></o:p></p>
<p class=MsoNormal>#3 0x00000000004c7776 in CbcMain1 (argc=3,
argv=0x7fffec9150c0,<o:p></o:p></p>
<p class=MsoNormal> model=@0x7fffec914bb0, callBack=0x4a734c
<dummyCallBack>)<o:p></o:p></p>
<p class=MsoNormal> at ../../../Cbc/src/CbcSolver.cpp:6680<o:p></o:p></p>
<p class=MsoNormal>#4 0x00000000004db968 in CbcMain1 (argc=3,
argv=0x7fffec9150c0,<o:p></o:p></p>
<p class=MsoNormal> model=@0x7fffec914bb0) at
../../../Cbc/src/CbcSolver.cpp:3099<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Note, if I run it from the command line using cbc executable,
the error does not occur.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>[magala@orclus71 MMKP]$ ~/COIN/coin-Cbc/build-g/bin/cbc
subProb.n0.c0.p1.b0.lp<o:p></o:p></p>
<p class=MsoNormal>Coin Cbc and Clp Solver version 1.2trunk, build May 27 2009<o:p></o:p></p>
<p class=MsoNormal>command line - /users/magala/COIN/coin-Cbc/build-g/bin/cbc
subProb.n0.c0.p1.b0.lp (default strategy 1)<o:p></o:p></p>
<p class=MsoNormal>Continuous objective value is 46.6667 - 0.00 seconds<o:p></o:p></p>
<p class=MsoNormal>Cgl0003I 20 fixed, 0 tightened bounds, 0 strengthened rows,
0 substitutions<o:p></o:p></p>
<p class=MsoNormal>Cgl0003I 5 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions<o:p></o:p></p>
<p class=MsoNormal>Cgl0003I 0 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions<o:p></o:p></p>
<p class=MsoNormal>Cgl0004I processed model has 0 rows, 0 columns (0 integer)
and 0 elements<o:p></o:p></p>
<p class=MsoNormal>Cbc3007W No integer variables - nothing to do<o:p></o:p></p>
<p class=MsoNormal>Cuts at root node changed objective from 46.6667 to -1.79769e+308<o:p></o:p></p>
<p class=MsoNormal>Probing was tried 0 times and created 0 cuts of which 0 were
active after adding rounds of cuts (0.000 seconds)<o:p></o:p></p>
<p class=MsoNormal>Gomory was tried 0 times and created 0 cuts of which 0 were
active after adding rounds of cuts (0.000 seconds)<o:p></o:p></p>
<p class=MsoNormal>Knapsack was tried 0 times and created 0 cuts of which 0
were active after adding rounds of cuts (0.000 seconds)<o:p></o:p></p>
<p class=MsoNormal>Clique was tried 0 times and created 0 cuts of which 0 were
active after adding rounds of cuts (0.000 seconds)<o:p></o:p></p>
<p class=MsoNormal>MixedIntegerRounding2 was tried 0 times and created 0 cuts
of which 0 were active after adding rounds of cuts (0.000 seconds)<o:p></o:p></p>
<p class=MsoNormal>FlowCover was tried 0 times and created 0 cuts of which 0
were active after adding rounds of cuts (0.000 seconds)<o:p></o:p></p>
<p class=MsoNormal>TwoMirCuts was tried 0 times and created 0 cuts of which 0
were active after adding rounds of cuts (0.000 seconds)<o:p></o:p></p>
<p class=MsoNormal>Result - Finished objective 46.66667 after 0 nodes and 0
iterations - took 0.00 seconds (total time 0.01)<o:p></o:p></p>
<p class=MsoNormal>Total time 0.01<o:p></o:p></p>
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