[Coin-discuss] Segfault when using CbcModel

[John J Forrest]

Kim,

Unable to build from file.  configure wants main.cc

However you should be able to get rid of error by changing preprocess 
option.  slacks are being replaced by integer variables and in this case 
preprocessing is doing very little so you end up with one more variable 
after preprocessing than before.  This is probably what is causing 
problem.  I may try and look at it.

So change your preprocessing default/option so translate[preProcess] in 
CoinSolveCbc5.cc is 0 e.g. preProcess=1 - that should fix problem.

John Forrest





[Coin-discuss] Segfault when using CbcModel

Kim Hansen 
to:
COIN discussion (and bugs)
02/07/2008 09:39 AM


Sent by:
coin-discuss-bounces at list.coin-or.org







I get a segfault in my program on a few lp problems. I don't know if
it is a bug in our way of using coin or it is a problem in coin.

The code that can reproduce the problem can be found at
http://ange.dk/~kim/segfault-11990.tar.gz

I have run our test program through valgrind and gets a lot of invalid
write, the first one is this, the entire valgrind output is in the
tar.gz as valgrind.log.
It looks like an array is allocated 8 bytes too short, but I have no
idea where too look for the reason for this problem.

==32256== Invalid write of size 1
==32256==    at 0x4026BA8: memcpy (mc_replace_strmem.c:402)
==32256==    by 0x40B7C05: CbcModel::branchAndBound(int) 
(CbcModel.cpp:1510)
==32256==    by 0x8051B22: CoinSolveCbc5::run() (CoinSolveCbc5.cc:461)
==32256==    by 0x804D01F: main (main.cc:256)
==32256==  Address 0x6598a80 is 0 bytes after a block of size 976 alloc'd
==32256==    at 0x4024F14: operator new[](unsigned) 
(vg_replace_malloc.c:268)
==32256==    by 0x40A86BC: CbcModel::CbcModel(CbcModel const&, bool)
(CoinHelperFunctions.hpp:156)
==32256==    by 0x8050ED7: CoinSolveCbc5::run() (CoinSolveCbc5.cc:222)
==32256==    by 0x804D01F: main (main.cc:256)

Regards,
-- 
Kim Hansen
Vadgårdsvej 3, 2.tv
2860 Søborg
Fastnet: 3956 2437  --  Mobil: 3091 2437

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