[Coin-lpsolver] Fw: [Coin-SMI] Smi unitTest crashes ClpNonLinearCost::ClpNonLinearCost(ClpSimplex*)

John J Forrest jjforre at us.ibm.com
Sun Mar 13 17:14:30 EST 2005 

With INF at 1.0e31 the assert fails.  With INF at 1.0e25 
ClpNonlinearCost.cpp writes beyond the end of array.  I will look into 
that but if I change INF to COIN_DBL_MAX my unitTest succeeds.

John Forrest



Alan King/Watson/IBM at IBMUS 
Sent by: coin-lpsolver-bounces at list.coin-or.org
03/11/2005 04:41 PM

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[Coin-lpsolver] Fw: [Coin-SMI] Smi unitTest crashes 
ClpNonLinearCost::ClpNonLinearCost(ClpSimplex*)







Hi CLP folks, 

See below.  I'll check the SMI/unitTest  but it looks as if it is 
triggering some strange behavior in Clp. 

Alan 
----- Forwarded by Alan King/Watson/IBM on 03/11/2005 04:39 PM ----- 
Alan King/Watson/IBM at IBMUS 
Sent by: coin-smi-bounces at list.coin-or.org 
03/11/2005 04:36 PM 


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Re: [Coin-SMI] Smi unitTest crashes









Hi Francois, 

I will make the fixes.  Thanks! 

The remaining problem appears to emanate from CLP.  I'll post it to the 
lpsolver discussion list and check it out. 

Alan 


Francois Margot <fmargot at andrew.cmu.edu> 
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03/11/2005 09:22 AM 


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[Coin-SMI] Smi unitTest crashes










Hi:

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The following is a repost of the message I sent to coin-discuss yesterday.

All COIN and Smi code are compiled with -g, lapack, and blas installed.

The unitTest of Smi fails on an assert related to upper bounds on 
variables.
This comes from the fact that ClpModel::gutsOfLoadModel readjusts the 
upper
bounds to COIN_DBL_MAX when the upper bound is > 1e27. In the unitTest
code, infinity is set to 1e31 and the assert fails since the expected
value of the upper bound is 1e31 when it is COIN_DBL_MAX.

The easiest way to fix this is to set INF = 1e25 in Smi/unitTest.cpp
(Note that INF is defined at two places in Smi/UnitTest.cpp).

After this change, the program still crashes on line 820 (initialSolve()).
I could not figure out why, but valgrind detects an error in CoinMpsIO.
The allocation of hash_ (in startHash()) is done with a new and the memory
is freed with a free() instead of a delete in 
releaseRedundantInformation().

Also, the destructor in SmiScnModel.cpp does not free memory correctly:
several delete must be replace by delete[] to get:

SmiScnModel::~SmiScnModel()
{
       delete osiStoch_;

       if (core_)
               delete core_;

       if (drlo_)
         delete[] drlo_;

       if (drup_)
         delete[] drup_;

       if (dclo_)
        delete[] dclo_;

       if (dcup_)
         delete[] dcup_;

       if (dobj_)
         delete[] dobj_;

       if (matrix_)
               delete matrix_;

Even after correcting all the above, it still crashes. The first
error detected by valgrind is:

==28062== Invalid write of size 4
==28062==    at 0xD558C6: ClpNonLinearCost::ClpNonLinearCost(ClpSimplex*)
(ClpNo
nLinearCost.cpp:108)
==28062==    by 0xDBBAA3: ClpSimplex::startup(int, int)
(ClpSimplex.cpp:5622)
==28062==    by 0xDD6081: ClpSimplexPrimal::primal(int, int)
(ClpSimplexPrimal.c
pp:191)
==28062==    by 0xDB3DB5: ClpSimplex::primal(int, int) 
(ClpSimplex.cpp:3632)
==28062==    by 0x647A85: OsiClpSolverInterface::initialSolve()
(OsiClpSolverInt
erface.cpp:169)
==28062==    by 0x8054059: SmiScnModelScenarioUnitTest() 
(unitTest.cpp:820)
==28062==    by 0x8055797: main (unitTest.cpp:1467)
==28062==    by 0x674BFB: __libc_start_main (in /lib/libc-2.3.2.so)
==28062==    by 0x804D730: (within
/home/fmargot/COIN/Smi/Test/Linux-g/unitTest)
==28062==    Address 0x49085FC is 0 bytes after a block of size 300504
alloc'd
==28062==    at 0x507886: __builtin_vec_new (vg_replace_malloc.c:203)
==28062==    by 0x5078DD: operator new[](unsigned) 
(vg_replace_malloc.c:216)
==28062==    by 0xD5580D: ClpNonLinearCost::ClpNonLinearCost(ClpSimplex*)
(ClpNo
nLinearCost.cpp:96)
==28062==    by 0xDBBAA3: ClpSimplex::startup(int, int)
(ClpSimplex.cpp:5622)
==28062==    by 0xDD6081: ClpSimplexPrimal::primal(int, int)
(ClpSimplexPrimal.c
pp:191)
==28062==    by 0xDB3DB5: ClpSimplex::primal(int, int) 
(ClpSimplex.cpp:3632)
==28062==    by 0x647A85: OsiClpSolverInterface::initialSolve()
(OsiClpSolverInt
erface.cpp:169)
==28062==    by 0x8054059: SmiScnModelScenarioUnitTest() 
(unitTest.cpp:820)
==28062==    by 0x8055797: main (unitTest.cpp:1467)
==28062==    by 0x674BFB: __libc_start_main (in /lib/libc-2.3.2.so)
==28062== ==28062== Invalid write of size 4

I hope someone knowing a little bit more about Smi than I do can fix this.

Francois
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