free.c抛出"此程序已停止工作"的异常

Question

当我使用Visual C++ 2010 Express的调试器运行程序(server.exe)时,它运行完美,但是当我作为exe运行它时它没有; 它崩溃了"Server.exe已停止工作"对话框.

接下来我将exe重命名为"ServerInstaller.exe"并且它有效,所以我认为这是一个权限错误,但它在管理员模式下不能与"Server.exe"一起使用.

然后我将VC++中的调试器连接到"Server.exe"程序,它在"free.c"中出现了异常.

这个文件中的代码是

void __cdecl _free_base (void * pBlock)
{

        int retval = 0;


        if (pBlock == NULL)
            return;

        RTCCALLBACK(_RTC_Free_hook, (pBlock, 0));

        retval = HeapFree(_crtheap, 0, pBlock);   // Exception thrown in this function
       if (retval == 0)
        {
            errno = _get_errno_from_oserr(GetLastError());
        }
}

例外是

Server.exe中0x770ae3be处的未处理异常:0xC0000005:访问冲突读取位置0x3765f8c7.

我检查了pBlock的值,它是0x007f82c0.

我的计划.

我的程序是RakNet服务器,并且已成功删除了一个播放器.服务器正在检查此时来自RakNet的消息

堆栈跟踪回来

    ntdll.dll!770ae3be()    
    [Frames below may be incorrect and/or missing, no symbols loaded for ntdll.dll] 
    ntdll.dll!770ae023()    
    kernel32.dll!75e814dd()     
>   msvcr100d.dll!_free_base(void * pBlock)  Line 50 + 0x13 bytes   C
    msvcr100d.dll!_free_dbg_nolock(void * pUserData, int nBlockUse)  Line 1431 + 0x9 bytes  C++
    msvcr100d.dll!_free_dbg(void * pUserData, int nBlockUse)  Line 1265 + 0xd bytes C++
    msvcr100d.dll!free(void * pUserData)  Line 49 + 0xb bytes   C++
    RakNetDebug.dll!RakNet::_RakFree_Ex(void * p, const char * file, unsigned int line)  Line 165 + 0xc bytes   C++
    RakNetDebug.dll!RakNet::ReliabilityLayer::FreeInternalPacketData(RakNet::InternalPacket * internalPacket, const char * file, unsigned int line)  Line 3766 + 0x17 bytes C++
    RakNetDebug.dll!RakNet::ReliabilityLayer::RemovePacketFromResendListAndDeleteOlderReliableSequenced(RakNet::uint24_t messageNumber, unsigned __int64 time, DataStructures::List<RakNet::PluginInterface2 *> & messageHandlerList, const RakNet::SystemAddress & systemAddress)  Line 2391   C++
    RakNetDebug.dll!RakNet::ReliabilityLayer::HandleSocketReceiveFromConnectedPlayer(const char * buffer, unsigned int length, RakNet::SystemAddress & systemAddress, DataStructures::List<RakNet::PluginInterface2 *> & messageHandlerList, int MTUSize, unsigned int s, RakNet::RakNetRandom * rnr, unsigned short remotePortRakNetWasStartedOn_PS3, unsigned int extraSocketOptions, unsigned __int64 timeRead, RakNet::BitStream & updateBitStream)  Line 776   C++
    RakNetDebug.dll!RakNet::ProcessNetworkPacket(RakNet::SystemAddress systemAddress, const char * data, const int length, RakNet::RakPeer * rakPeer, RakNet::RakNetSmartPtr<RakNet::RakNetSocket> rakNetSocket, unsigned __int64 timeRead, RakNet::BitStream & updateBitStream)  Line 5012 C++
    RakNetDebug.dll!RakNet::RakPeer::RunUpdateCycle(unsigned __int64 timeNS, unsigned __int64 timeMS, RakNet::BitStream & updateBitStream)  Line 5099 + 0x81 bytes  C++
    RakNetDebug.dll!RakNet::UpdateNetworkLoop(void * arguments)  Line 5868  C++
    msvcr100d.dll!_callthreadstartex()  Line 314 + 0xf bytes    C
    msvcr100d.dll!_threadstartex(void * ptd)  Line 297  C
    kernel32.dll!75e833aa()     
    ntdll.dll!770b9ef2()    
    ntdll.dll!770b9ec5() 

Answer 1

如果你的指针有一个值,并且你得到这样的错误,那很可能意味着你试图多次释放内存.检查代码,并尝试查找您释放的次数.停止此操作的一种方法是在释放指向的块后立即将指针设置为零.

另一种可能性是你没有使用msvcrt并且你正在加载一个也没有使用msvcrt的DLL,并且分配发生在可执行文件或DLL中,并在另一个中释放.