HEAP[xxx.exe]: Invalid address specified to RtlValidateHeap( 0xxxxxx, 0x000xx)

One 、 crime scene

class TcpRemoting {
    
public:
void Send(unsigned char *data) {
    
	//  The lock should be added here 
	if(_dataRaw != NULL) {
    
	//  Multithreading without lock , It is possible that multiple threads release the same block of memory at the same time, resulting in program exceptions 
		delete _dataRaw; 
		_dataRaw = NULL;
	}
	_dataRaw = new unsigned char;
	memcpy(_dataRaw, data, sizeof(unsigned char));
}
public:
unsigned char *_dataRaw;
};

• Use customization TcpRemoting Class Send Method send data , Now there are two threads to send at the same time Send(A) and Send(B), At this time, an exception may appear in the call stack

HEAP[xxx.exe]: Invalid address specified to RtlValidateHeap( 020B0000, 12920EC0 )