[Clp] Dense LP Problem Interface

[Miles Lubin]

All,

Matt passed the data files to me privately, and I can reproduce the
segfault. Here's the backtrace:

#0  0x00007fffc8143bae in ClpFactorization::factorize (this=0x315cac0,
    model=0x79fb260, solveType=1, valuesPass=false) at
ClpFactorization.cpp:2208
#1  0x00007fffc81fdbaa in ClpSimplex::internalFactorize (this=0x79fb260,
solveType=1)
    at ClpSimplex.cpp:1995
#2  0x00007fffc828c35b in ClpSimplexPrimal::statusOfProblemInPrimal
(this=0x79fb260,
    lastCleaned=@0x7fffffffbafc: 0, type=1, progress=0x79fb7a8,
doFactorization=true,
    ifValuesPass=0, originalModel=0x0) at ClpSimplexPrimal.cpp:851
#3  0x00007fffc828ae46 in ClpSimplexPrimal::primal (this=0x79fb260,
ifValuesPass=0,
    startFinishOptions=0) at ClpSimplexPrimal.cpp:357
#4  0x00007fffc8211cc3 in ClpSimplex::primal (this=0x79fb260,
ifValuesPass=1,
    startFinishOptions=0) at ClpSimplex.cpp:5974
#5  0x00007fffc829eb4d in ClpSimplex::initialSolve (this=0x79fb260,
options=...)
    at ClpSolve.cpp:2392
#6  0x00007fffc8126edf in Clp_initialSolveWithOptions (model=0x3da3aa0,
s=0x4747d90)
    at Clp_C_Interface.cpp:798

The line in question is:

elementU[i] = slackValue;

and gdb reports that elementU is uninitialized (more precisely, zero).
Perhaps an unsuccessful call to malloc()? That's about all the debugging I
can do for now.

Best,
Miles

On Wed, Jul 8, 2015 at 6:40 PM, Miles Lubin <miles.lubin at gmail.com> wrote:

> No, segfaulting usually isn't an inherent property of an LP instance :)
> If you can post the .mat file and short julia script which you use to run
> it, I can try running the instance under debug mode myself.
>
> Best,
> Miles
>
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