Potential Memory Leak when enabling Validation Layers

[youss2017]

Environment:

• OS: Windows 11 Version 22H2 (OS Build 22621.1702)
• GPU: Radeon RX 6700 XT AMD Driver Version 23.4.2; Released 4/12/2023
• SDK or header version if building from repo: 1.3.239.0
• Options enabled (synchronization, best practices, etc.): VK_EXT_debug_utils; VK_LAYER_KHRONOS_validation;ValidationFeatureEnableEXT::eSynchronizationValidation

When creating and freeing a VkCommandPool, the application's memory usages continues to rise without returning to original usage after calling vkDestroyCommandPool. This appears to be a memory leak. Note, that this only happens once Validation Layers and ValidationFeatureEnableEXT::eSynchronizationValidation are enabled.

	vk::Device device = ctx->Device;
	while (true) {
#if 1
		vk::CommandPool pool = device.createCommandPool({});
		vk::CommandBuffer cmd = device.allocateCommandBuffers(vk::CommandBufferAllocateInfo(pool, vk::CommandBufferLevel::ePrimary, 1))[0];
		device.destroyCommandPool(pool);
#else
		VkCommandPool pool;
		VkCommandBuffer cmd;

		VkCommandPoolCreateInfo createInfo{ VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO };
		createInfo.queueFamilyIndex = ctx->GraphicsQueueFamilyIndex;
		vkCreateCommandPool(device, &createInfo, nullptr, &pool);
		VkCommandBufferAllocateInfo cmdAllocate{ VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO };
		cmdAllocate.commandBufferCount = 1;
		cmdAllocate.commandPool = pool;
		cmdAllocate.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
		vkAllocateCommandBuffers(device, &cmdAllocate, &cmd);

		vkDestroyCommandPool(device, pool, nullptr);
#endif
		this_thread::sleep_for(chrono::milliseconds(1));
	}

Expected behavior

The expected behavior is that once a VkCommandPool is freed, the memory should return previous state before the VkCommandPool was allocated.

code or terminal output

Validation Warning: [ UNASSIGNED-BestPractices-vkCreateDevice-deprecated-extension ] Object 0: handle = 0x21f79a74f50, type = VK_OBJECT_TYPE_INSTANCE; | MessageID = 0xad32db6 | CreateDevice(): Attempting to enable deprecated extension VK_KHR_shader_non_semantic_info, but this extension has been promoted to VK_VERSION_1_3.

[juan-lunarg]

SDK or header version if building from repo: 1.3.239.0

This is a fairly old version of the validation layers. We now run address sanitizer on CI to catch leaks and other misc. types of bugs. Are you sure this still occurs?

[youss2017]

I will try updating.

[youss2017]

Thanks Juan,
After updating from 1.3.239.0 to 1.3.250.0 the memory leak no longer occurs.