why code is blocked strange in this function - c++

Question

I'm writing a tiny system kernel follow this video:https://www.youtube.com/watch?v=1rnA6wpF0o4&list=PLHh55M_Kq4OApWScZyPl5HhgsTJS9MZ6M.
i meet a problem that doesn't emerge in the video: code just is blocked in getDriver function when PCI controller identify all devices
//PCI controller function
void PeripheralComponentInterconnectController::selectDrivers(DriverManager* driver_manager,InterruptManager* interrupt_manager){
// printf("{ void PeripheralComponentInterconnectController::selectDrivers\n");
int function_num=0;
for(int bus=0;bus<8;++bus){
for(int device=0;device<32;++device){
function_num=deviceHasFunction(bus,device) ? 8:1;
for(int function=0;function<function_num;++function){
PeripheralComponentInterconnectDeviceDescriptor dev= getDeviceDescriptor(bus,device,function);
if(dev.vendor_id == 0 || dev.vendor_id == 0xFFFF){
continue;
}
for(int bar_num=0;bar_num<6;++bar_num){
BaseAddreeRegister bar = getBaseAddressRegister(bus,device,function,bar_num);
if(bar.addr && (bar.type == InputOutput))
dev.port_base = (uint32_t)bar.addr;
}
// blocked in this getDriver
Driver* driver = getDriver(dev, interrupt_manager);
if(driver != 0){
driver_manager->AddDriver(driver);
}
//end
printf("FOUND DEVICE:");
printf("PCI BUS:");
printfHex(bus & 0xFF);
printf(",DEVICE:");
printfHex(device & 0xFF );
printf(", FUNCTION:");
printfHex(function & 0xFF);
printf(" = VENDOR_ID:");
printfHex((dev.vendor_id & 0xFF00) >> 8);
printfHex(dev.vendor_id & 0xFF);
printf(",DEVICE_ID:");
printfHex((dev.device_id & 0xFF00) >> 8);
printfHex(dev.device_id & 0xFF);
printf("\n");
}
}
}
}
//getDriver function:
Driver*
PeripheralComponentInterconnectController::getDriver(PeripheralComponentInterconnectDeviceDescriptor dev,
InterruptManager* interrupt_manager){
return 0;
}
output:
------------------------------------------------------------------------------
you can see there are nothing in getDriver now ,but its still blocked in here.
I downloaded source code from the video and meet same problem.therefore,I'm sure it's my computer problem .
I thought it might have something to do with stacks(maybe stack overflow :),after that, I alter the parameter PeripheralComponentInterconnectDeviceDescriptor dev toPeripheralComponentInterconnectDeviceDescriptor* dev so that reduce stack usage,and it work fine .
i try to add compile parameter after that and alter back to PeripheralComponentInterconnectDeviceDescriptor dev.
-Wl,-z,stack-size=4194304
and enlarger the space that behind esp pointer so that avoid esp overwrite something,and it's blocked again :(.
have somebody tell me what happen? Why isn't blocked in code of video.thinks!
//makefile complie parameter
GCCPARAMS = -m32 -fno-use-cxa-atexit -nostdlib -fno-builtin -fno-rtti -fno-exceptions -fno-leading-underscore -Wno-write-strings -fpermissive -fno-stack-protector -Iinclude