BSOD - Install KMDF driver twice

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My PC show BSOD when I install KMDF driver twice, but the sample from MSDN didn't cause this

Here is my code:

#define DEV_NAME L"\\Device\\MyDriver"
#define SYM_NAME L"\\DosDevices\\MyDriver"

#define IOCTL_SET CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_GET CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS)

char szBuffer[255]={0};

void IrpFileCreate(WDFDEVICE Device, WDFREQUEST Request, WDFFILEOBJECT FileObject)
{
DbgPrint("IrpFieCreate");
WdfRequestComplete(Request, STATUS_SUCCESS);
}

void IrpFileClose(WDFFILEOBJECT FileObject)
{
DbgPrint("IrpFieClose");
}

void IrpIOCTL(WDFQUEUE Queue, WDFREQUEST Request, size_t OutputBufferLength, size_t InputBufferLength, ULONG IoControlCode)
{
ULONG len;
WDFMEMORY memory;

switch(IoControlCode){
case IOCTL_SET:
DbgPrint("IOCTL_SET");
WdfRequestRetrieveInputMemory(Request, &memory);
WdfMemoryCopyToBuffer(memory, 0, szBuffer, InputBufferLength);
DbgPrint("Buffer: %s, Length:%d", szBuffer, InputBufferLength);
WdfRequestSetInformation(Request, InputBufferLength);
break;
case IOCTL_GET:
DbgPrint("IOCTL_GET");
WdfRequestRetrieveOutputMemory(Request, &memory);
WdfMemoryCopyFromBuffer(memory, 0, szBuffer, OutputBufferLength);
len = strlen(szBuffer) + 1;
WdfRequestSetInformation(Request, len);
break;
}
WdfRequestComplete(Request, STATUS_SUCCESS);
}

NTSTATUS AddDevice(WDFDRIVER Driver, PWDFDEVICE_INIT pDeviceInit)
{
WDFDEVICE device;
UNICODE_STRING suDevName;
UNICODE_STRING szSymName;
WDF_FILEOBJECT_CONFIG file_cfg;
WDF_IO_QUEUE_CONFIG ioqueue_cfg;

RtlInitUnicodeString(&suDevName, DEV_NAME);
RtlInitUnicodeString(&szSymName, SYM_NAME);
WdfDeviceInitAssignName(pDeviceInit, &suDevName);

WdfDeviceInitSetIoType(pDeviceInit, WdfDeviceIoBuffered);
WDF_FILEOBJECT_CONFIG_INIT(&file_cfg, IrpFileCreate, IrpFileClose, NULL);
WdfDeviceInitSetFileObjectConfig(pDeviceInit, &file_cfg, WDF_NO_OBJECT_ATTRIBUTES);
WdfDeviceCreate(&pDeviceInit, WDF_NO_OBJECT_ATTRIBUTES, &device);
WdfDeviceCreateSymbolicLink(device, &szSymName);

WDF_IO_QUEUE_CONFIG_INIT_DEFAULT_QUEUE(&ioqueue_cfg, WdfIoQueueDispatchSequential);
ioqueue_cfg.EvtIoDeviceControl = IrpIOCTL;
return WdfIoQueueCreate(device, &ioqueue_cfg, WDF_NO_OBJECT_ATTRIBUTES, WDF_NO_HANDLE);
}

NTSTATUS DriverEntry(PDRIVER_OBJECT pOurDriver, PUNICODE_STRING pRegistry)
{
WDF_DRIVER_CONFIG config;

WDF_DRIVER_CONFIG_INIT(&config, AddDevice);
return WdfDriverCreate(pOurDriver, pRegistry, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);
}

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