[gecode-users] Crash while freeing memory in connection with VS2010

[Christian Schulte]

I came to the same conclusion and this is already a problem if you do not
mix versions: allocation and deallocation must always be done by the same
DLL, this is a known bug in Windows. I'll fix that for 3.4.3.

 

We do not use project files but Makefiles with Cygwin, check MPG for
details.

 

Christian

 

--

Christian Schulte, www.ict.kth.se/~cschulte/

 

From: Alexander Kleff [mailto:alexander.kleff at ptv.de] 
Sent: Thursday, January 20, 2011 12:15 PM
To: cschulte at kth.se; 'Mikael Zayenz Lagerkvist'
Cc: users at gecode.org
Subject: AW: [gecode-users] Crash while freeing memory in connection with
VS2010

 

Hi,

 

after some research I came to the following conclusion:

Due to inlining, the memory of the node in LinExpr will be allocated by
msvcr100d.dll, whilst at least the destructor of LinExpr is not inlined. The
memory of the node will therefore be freed by msvcr90d.dll. This will not
work.

As I see it, there is no other way for me than to have Gecode bound to
msvcr100d.dll. Can you help me out by making your VS2008 project files
available? This way, it would be much easier to migrate to VS2010 than to
start from scratch.

 

Cheers,

Alexander

 

 

 

Von: users-bounces at gecode.org [mailto:users-bounces at gecode.org] Im Auftrag
von Alexander Kleff
Gesendet: Donnerstag, 20. Januar 2011 10:43
An: cschulte at kth.se; 'Mikael Zayenz Lagerkvist'
Cc: users at gecode.org
Betreff: Re: [gecode-users] Crash while freeing memory in connection with
VS2010

 

Hi,

 

I made another project (currently for x86 platform) to make sure it is
unmanaged. Unfortunately, the problem still arises, although I cannot see
anything suspicious. Any other idea?

I'm using the 3.4.2 binaries from your site, so both msvcr90d.dll and
msvcr100d.dll are currently loaded.

 

Thanks for any suggestion,

Alexander

 

Von: Christian Schulte [mailto:cschulte at kth.se] 
Gesendet: Donnerstag, 20. Januar 2011 09:03
An: 'Mikael Zayenz Lagerkvist'; Alexander Kleff
Cc: users at gecode.org
Betreff: RE: [gecode-users] Crash while freeing memory in connection with
VS2010

 

Please,

 

also let us know which platform (x86 versus x64) and whether you use the
binaries we distribute or have build them yourselves (then we need to know
whether you built with 2008 or 2010)

 

Thanks

Christian

 

--

Christian Schulte, www.ict.kth.se/~cschulte/

 

From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf
Of Mikael Zayenz Lagerkvist
Sent: Wednesday, January 19, 2011 8:46 PM
To: Alexander Kleff
Cc: users at gecode.org
Subject: Re: [gecode-users] Crash while freeing memory in connection with
VS2010

 

Hi,

 

You seem to be using managed C++. Have you tried running your program with
standard C++? The different memory policy might be a source of problems.

 

I don't have a Windows machine to test on, so I haven't tried your program
myself.

 

Cheers,

Mikael

2011/1/19 Alexander Kleff <alexander.kleff at ptv.de>

Hi once again,

 

the code below compiles and links in both versions (so I assume I did not
make an all too obvious modeling mistake) but it crashes in VS2010 in
contrast to VS2008(Express).

The error seems to occur during the destruction of the linear expression.
The debugger sets the break point to Heap::rfree(void* p) in heap.hpp in all
three cases.

Can you reproduce it? 

 

Thanks for help,

Alexander

 

 

 

#include <gecode/minimodel.hh>

 

using namespace Gecode;

 

class GecodeTest : public Space {

public:

  GecodeTest(void) 

  {

   IntVar z(*this, 0, 1);

 

   IntVar e1 = expr(*this, 1 * z);

   IntVar e2 = expr(*this, z);      // error 1

 

   IntArgs cost(2);

   for (int v=0; v<2; ++v)

   {

      cost[v] = v;      

   }

 

   LinExpr xy = element(cost, z);  

   IntVar e3 = expr(*this, xy);

   IntVar e4 = expr(*this, element(cost, z));   // error 2

  } // error 3 (in destructor)

 

 

  GecodeTest(bool share, GecodeTest& s) : Space(share, s) {}

  virtual Space* copy(bool share) { return new GecodeTest(share,*this); }

};

 

 

// main function

int main(array<System::String ^> ^args)

{

  GecodeTest* m = new GecodeTest;

  delete m;

  return 0;

}

 


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-- 
Mikael Zayenz Lagerkvist, http://www.ict.kth.se/~zayenz/

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