Re: [Boost-users] [shared_ptr] make_shared causes Access Violation

Subject: Re: [Boost-users] [shared_ptr] make_shared causes Access Violation
From: Paul Heil (paul.heil_at_[hidden])
Date: 2011-05-10 16:31:55

I can declare two instances of Foo with no error:

    int _tmain( int argc, _TCHAR* argv[] )
    {
        Foo a;
        Foo b;
        return 0;
    }

The linker options I'm using are /STACK 65536,4096. So, the stack should be
capable of handling 16 times sizeof( Foo ).

-PaulH

On Tue, May 10, 2011 at 3:17 PM, Krzysztof Czainski <1czajnik_at_[hidden]>wrote:

> 2011/5/10 Paul Heil <paul.heil_at_[hidden]>
>
>> I have a Visual Studio 2008 C++ application for ARMV4I Windows Mobile 6
>> where I'm using `boost::shared_ptr<>` to manage a fairly large object (4KB).
>> Unfortunately, `boost::make_shared<>` causes an Access Violation exception.
>> I am using Boost 1.45.0 with STLPort 5.2.1.
>>
>> My code:
>>
>>     struct Foo
>>     {
>>         char a[ 4 * 1024 - 1 ];
>>     };
>>
>>     int _tmain( int argc, _TCHAR* argv[] )
>>     {
>>         boost::shared_ptr< Foo > f = boost::make_shared< Foo >(); //
>> Access Violation
>>         return 0;
>>     }
>>
>> The exception callstack:
>>
>>     test.exe!boost::detail::sp_ms_deleter<o>::sp_ms_deleter<o>(void) Line:
>> 60, Byte Offsets: 0x18    C++
>>     test.exe!boost::make_shared<o>(void) Line: 106, Byte Offsets: 0x5c
>> C++
>>     test.exe!wmain(int argc = 1, wchar_t** argv = 0x01b40060) Line: 81,
>> Byte Offsets: 0x18    C++
>>     test.exe!mainWCRTStartup(HINSTANCE__* hInstance = 0x00000003,
>> HINSTANCE__* hInstancePrev = 0x00000000, unsigned short* lpszCmdLine =
>> 0x00000003, int nCmdShow = 0) Line: 188, Byte Offsets: 0x94    C++
>>
>> The location of the exception (boost\smart_ptr\make_shared.hpp):
>>
>>     template< class T > class sp_ms_deleter
>>     {
>>         /* snip! */
>>     public:
>>         sp_ms_deleter(): initialized_( false )
>>         {    // line: 60  this = NULL
>>         }
>>
>>         /* snip! */
>>
>> This issue does not occur when compiling for x86 Windows. This issue also
>> does not occur when using the shared_ptr like this:
>>
>>     boost::shared_ptr< Foo > f1 = boost::shared_ptr< Foo >( new Foo );
>>
>> Can anybody explain what's going on and why this is breaking only on
>> ARMV4I Windows Mobile 6?
>>
>> Thanks,
>> PaulH
>>
>
> My guess: stack overflow. If I remember correctly, 2 times sizeof( Foo )
> must fit on the stack when using make_shared.
>
> Regards,
> Kris
>
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