[Cbc] failure in small IP

[Matthew Galati]

The run with cbc executable that does not fail was using a May 2009 version
of code.

Using the current trunk it fails (same as when using CbcMain1):

[magala at orclus71 src]$ ./cbc ~/subProb.n0.c0.p1.b0.lp

Coin Cbc and Clp Solver version 1.2trunk, build Sep 10 2009

command line - ./cbc /users/magala/subProb.n0.c0.p1.b0.lp (default strategy
1)

Continuous objective value is 46.6667 - 0.00 seconds

Cgl0003I 20 fixed, 0 tightened bounds, 0 strengthened rows, 0 substitutions

Cgl0003I 5 fixed, 0 tightened bounds, 0 strengthened rows, 8 substitutions

Cgl0003I 0 fixed, 0 tightened bounds, 0 strengthened rows, 8 substitutions

Cgl0004I processed model has 0 rows, 0 columns (0 integer) and 0 elements

Segmentation fault




 The following small IP fails using the CbcMain1 interface. It is a unique
> case, because all rows and cols are removed by presolver.
>
>
>
> http://coral.ie.lehigh.edu/~magh/tmp/subProb.n0.c0.p1.b0.lp<http://coral.ie.lehigh.edu/%7Emagh/tmp/subProb.n0.c0.p1.b0.lp>
>
>
>
> https://projects.coin-or.org/Cbc/ticket/79
>
>
>
>           CbcModel cbc(*subprobSI);
>
>           CbcMain0(cbc);
>
>           const char * argv[] = {"cbc","-solve","-quit"};
>
>           CbcMain1(3, argv, cbc);
>
>
>
> Coin Cbc and Clp Solver version 1.2trunk, build Sep  9 2009
>
> command line - cbc -solve -quit (default strategy 1)
>
> Continuous objective value is 46.6667 - 0.00 seconds
>
> Cgl0003I 20 fixed, 0 tightened bounds, 0 strengthened rows, 0 substitutions
>
> Cgl0003I 5 fixed, 0 tightened bounds, 0 strengthened rows, 8 substitutions
>
> Cgl0003I 0 fixed, 0 tightened bounds, 0 strengthened rows, 8 substitutions
>
> Cgl0004I processed model has 0 rows, 0 columns (0 integer) and 0 elements
>
>
>
> gdb gives:
>
>
>
> Program received signal SIGSEGV, Segmentation fault.
>
> 0x0000003ffa871f6b in free () from /lib64/libc.so.6
>
> (gdb) where
>
> #0  0x0000003ffa871f6b in free () from /lib64/libc.so.6
>
> #1  0x000000000057bc41 in ~CbcRounding (this=0x7fffec90c080)
>
>     at ../../../Cbc/src/CbcHeuristic.cpp:1552
>
> #2  0x00000000004ae837 in doHeuristics (model=0x1d1f3e00, type=1)
>
>     at ../../../Cbc/src/CbcSolver.cpp:3479
>
> #3  0x00000000004c7776 in CbcMain1 (argc=3, argv=0x7fffec9150c0,
>
>     model=@0x7fffec914bb0, callBack=0x4a734c <dummyCallBack>)
>
>     at ../../../Cbc/src/CbcSolver.cpp:6680
>
> #4  0x00000000004db968 in CbcMain1 (argc=3, argv=0x7fffec9150c0,
>
>     model=@0x7fffec914bb0) at ../../../Cbc/src/CbcSolver.cpp:3099
>
>
>
>
>
>
>
> Note, if I run it from the command line using cbc executable, the error
> does not occur.
>
>
>
> [magala at orclus71 MMKP]$ ~/COIN/coin-Cbc/build-g/bin/cbc
> subProb.n0.c0.p1.b0.lp
>
> Coin Cbc and Clp Solver version 1.2trunk, build May 27 2009
>
> command line - /users/magala/COIN/coin-Cbc/build-g/bin/cbc
> subProb.n0.c0.p1.b0.lp (default strategy 1)
>
> Continuous objective value is 46.6667 - 0.00 seconds
>
> Cgl0003I 20 fixed, 0 tightened bounds, 0 strengthened rows, 0 substitutions
>
> Cgl0003I 5 fixed, 0 tightened bounds, 0 strengthened rows, 8 substitutions
>
> Cgl0003I 0 fixed, 0 tightened bounds, 0 strengthened rows, 8 substitutions
>
> Cgl0004I processed model has 0 rows, 0 columns (0 integer) and 0 elements
>
> Cbc3007W No integer variables - nothing to do
>
> Cuts at root node changed objective from 46.6667 to -1.79769e+308
>
> Probing was tried 0 times and created 0 cuts of which 0 were active after
> adding rounds of cuts (0.000 seconds)
>
> Gomory was tried 0 times and created 0 cuts of which 0 were active after
> adding rounds of cuts (0.000 seconds)
>
> Knapsack was tried 0 times and created 0 cuts of which 0 were active after
> adding rounds of cuts (0.000 seconds)
>
> Clique was tried 0 times and created 0 cuts of which 0 were active after
> adding rounds of cuts (0.000 seconds)
>
> MixedIntegerRounding2 was tried 0 times and created 0 cuts of which 0 were
> active after adding rounds of cuts (0.000 seconds)
>
> FlowCover was tried 0 times and created 0 cuts of which 0 were active after
> adding rounds of cuts (0.000 seconds)
>
> TwoMirCuts was tried 0 times and created 0 cuts of which 0 were active
> after adding rounds of cuts (0.000 seconds)
>
> Result - Finished objective 46.66667 after 0 nodes and 0 iterations - took
> 0.00 seconds (total time 0.01)
>
> Total time 0.01
>
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>
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