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Editorial Team
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Asked: 2026-05-21T03:44:31+00:00

I’m getting a weird access violation at the end of my main whose cause

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I’m getting a weird access violation at the end of my main whose cause I’m having some difficulties finding.

When shutting down my application I get an access violation in the following:

xdebug

        // TEMPLATE FUNCTION _DebugHeapDelete
template<class _Ty>
    void __CLRCALL_OR_CDECL _DebugHeapDelete(_Ty *_Ptr)
    {   // delete from the debug CRT heap even if operator delete exists
    if (_Ptr != 0)
        {   // worth deleting
        _Ptr->~_Ty();
        // delete as _NORMAL_BLOCK, not _CRT_BLOCK, since we might have
        // facets allocated by normal new.
        free(_Ptr); // **ACCESS VIOLATION**
        }
    }

Stack trace:

>   msvcp100d.dll!std::_DebugHeapDelete<void>(void * _Ptr)  Line 62 + 0xa bytes C++
    msvcp100d.dll!std::numpunct<char>::_Tidy()  Line 190 + 0xc bytes    C++
    msvcp100d.dll!std::numpunct<char>::~numpunct<char>()  Line 122  C++
    msvcp100d.dll!std::numpunct<char>::`scalar deleting destructor'()  + 0x11 bytes C++
    msvcp100d.dll!std::_DebugHeapDelete<std::locale::facet>(std::locale::facet * _Ptr)  Line 62 C++
    msvcp100d.dll!std::_Fac_node::~_Fac_node()  Line 23 + 0x11 bytes    C++
    msvcp100d.dll!std::_Fac_node::`scalar deleting destructor'()  + 0x11 bytes  C++
    msvcp100d.dll!std::_DebugHeapDelete<std::_Fac_node>(std::_Fac_node * _Ptr)  Line 62 C++
    msvcp100d.dll!_Fac_tidy()  Line 41 + 0x9 bytes  C++
    msvcp100d.dll!std::_Fac_tidy_reg_t::~_Fac_tidy_reg_t()  Line 48 + 0xe bytes C++
    msvcp100d.dll!std::`dynamic atexit destructor for '_Fac_tidy_reg''()  + 0xf bytes   C++
    msvcp100d.dll!_CRT_INIT(void * hDllHandle, unsigned long dwReason, void * lpreserved)  Line 415 C
    msvcp100d.dll!__DllMainCRTStartup(void * hDllHandle, unsigned long dwReason, void * lpreserved)  Line 526 + 0x11 bytes  C
    msvcp100d.dll!_DllMainCRTStartup(void * hDllHandle, unsigned long dwReason, void * lpreserved)  Line 476 + 0x11 bytes   C

Anyone got any ideas as to what might cause this?

I read something about facets being cached not sure if thats related?

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1 Answer

  1. Editorial Team

    Memory corruption bugs can (obviously) cause this (and many other kinds) of failure.

    Have you tried using valgrind (memcheck) or Rational Purify against this? It will probably report the problem (possibly buried in a whole lot of other information if this would be the first time you ran such a check on your code base. You will still want to devise a minimal ‘main’ implementation that exhibits the behaviour to run under a memory and bounds checker

    $0.02

    PS. just in case, memory corruption bugs usually arise

    • by dereferencing stale pointers (after free/delete)
    • by writing beyond the end of an allocated buffer
    • by freeing/deleting previously pointers (mostly a symptom of bad ownership tracking)
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