I installed my Vulkan work on my Debian desktop and tried to compile the most basic code :

//#include <Core/Core.h>
#include <iostream>
#include <vulkan/vulkan.h>

int main(int argc, const char *argv[])
//CONSOLE_APP_MAIN
{
	VkInstance instance;
	VkApplicationInfo appInfo{};
    appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
    appInfo.pApplicationName = "Hello Triangle";
    appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
    appInfo.pEngineName = "No Engine";
    appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
    appInfo.apiVersion = VK_API_VERSION_1_0;

    VkInstanceCreateInfo createInfo{};
    createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
    createInfo.pApplicationInfo = &appInfo;
    createInfo.enabledExtensionCount = 0;
    createInfo.ppEnabledExtensionNames = nullptr;
    createInfo.enabledLayerCount = 0;

    if (vkCreateInstance(&createInfo, nullptr, &instance) != VK_SUCCESS) {
        #ifndef CORE_H
			std::cout << "Error\n";
        #else
			Upp::Cout() << "Error\n";
        #endif
    }else{
		vkDestroyInstance(instance, nullptr);
    }
}

A simple vulkan instance creation using default allocator. Here is my probblem:

If I include Core in my project without using USEMALLOC flag. This simple code result in memory leak :

with USEMALLOC (or removing Core package) no problem happen.

From my knowledge, Vulkan, in order to work properly must have allocator that's aligned on 4 octet. May it's the reason of this error ?

U++ allocator aligns to 16 bytes. More likely Vulkan is calling new/delete and it is "system" new/delete - there is no solution to the problem AFAIK. Same issue we encountered on macos; partial solution is to use U++ allocator where U++ is using it directly (which is still plentiful) and use standard new/delete elsewhere. I think it is flagSTDNEWDELETE - check PLATFORM_MACOS.

void* UVkCustomAllocator::DefaultAllocation(size_t size, size_t alignement, VkSystemAllocationScope allocationScope){
	void* ptr;
	if(alignement < size){
		ptr = malloc(size);
		ASSERT_(ptr, "Error during malloc for size of " +  AsString(size));
	}else{
		int rc = posix_memalign(&ptr, alignement, size);
		ASSERT_(rc == 0,"Error code : "+ AsString(rc) +" during posix_memalign for size of " +  AsString(size) + " and alignement of " + AsString(alignement));
	}
    return ptr;
}

void  UVkCustomAllocator::DefaultFree(void* pMemory){
	if(pMemory){
		return free(pMemory);
	}
}