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Won't Fix
Votes
0
Found in
2021.3.25f1
Issue ID
UUM-35361
Regression
No
Editor freezes on SceneView.Paint Unity's code execution when entering Play Mode in a project that uses Vulkan Graphics API
Reproduction steps:
1. Open the attached “repro-project“
2. Open Assets/Main Scene.unity scene
3. Enter Play Mode
Expected result: Play Mode is entered successfully
Actual result: The Editor freezes on SceneView.Paint Unity’s code execution
Reproducible with: 2021.3.25f1
Not reproducible with: 2022.2.0b3, 2022.2.19f1, 2023.1.0b16, 2023.1.0a14
Could not test with: 2020.3.48f1 (could not downgrade the project), 2022.2.0a1, 2022.2.0b2 (due to errors in the Console)
Reproduced on: Windows 10 Pro
Notes:
1. Not reproducible with DirectX Graphics API
2. Memory errors (“Vulkan - Out of memory when trying to allocate swapchain staging image”, “Vulkan - Suboptimal memory type used for image because of low memory“, etc) are spammed in the Editor.log file
3. The Editor sometimes crashes with the following stack trace:
{{0x00007FFE82F66FED (vulkan-1) vkDestroyDescriptorPool }}
{{0x00007FF745C7ADA6 (Unity) vk::SwapChain::SetupSwapChainImages }}
{{0x00007FF745C6BAC1 (Unity) vk::SwapChain::Create }}
{{0x00007FF745C7BDED (Unity) vk::SwapChain::UpdateConfiguration }}
{{0x00007FF745CAA073 (Unity) GfxDeviceVK::UpdatePrimarySwapChain}}
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Resolution Note:
The crash is caused by out of memory and there is no good way to fix it in older version. DirectX can mitigate this issue by swapping resources from GPU to system memory, but Vulkan does not have such capability. When GPU memory runs out, we start to allocate resources in system memory thus the "Suboptimal memory type used for image because of low memory" log. If the system memory also runs out, the engine will crash if the resource attempting to allocate is critical like in this case the swapchain staging image. The total available memory in the system is dependent on the environment as other running programs also compete for resources, so the crash can seem random.