Summary
UnrealEditor becomes unresponsive, though not completely crashed or locked as certain messages still appear periodically in the logs, when opening modal dialogs within the editor on Linux. Once this state is reached, the editor appears stuck in this state and the process must be forcibly killed.
The issue is easily reached by attempting to create a new project. Upon clicking the create button, an outline of a modal dialog appears, but the interior is never rendered. At the same time, the logs present this message:
[2026.06.22-03.35.31:688][978]LogVulkanRHI: AcquireNextImage() failed due to the outdated swapchain, not even attempting to present.
Further analysis of the issue shows, via Unreal Insights and manual debugging, that the engine is stuck within the FVulkanDynamicRHI::WaitAndProcessInterruptQueue method, apparently continually timing out on a call to VulkanRHI::vkWaitSemaphoresKHR. The Vulkan Semaphore apparently never reaches whatever value is being expected of it, as the editor waits here forever. This then blocks the main editor process from continuing with whatever it was doing (e.g. trying to render a modal dialog) and the whole process grinds to a halt.
System information:
Unreal Engine Version: 5.7.4
OS: Linux - Debian - Bullseye - Kernel 5.10.0-22-amd64
GPU: Nvidia GeForce RTX 3070
GPU Driver Version: 595.84
What Type of Bug are you experiencing?
Rendering (Graphics / Niagara)
Steps to Reproduce
- Launch the editor
- Open File → New Project
- Configure Project settings (I used a C++ project, scalable, no VS-Code)
- Click Create
Expected Result
Editor continues to run as expected, opening and displaying any necessary dialogs and responding to user input.
Observed Result
Editor freezes upon pressing Create, showing only the outlines of spawning in modal windows but never rendering them. User input is ignored.
Affects Versions
5.7
Platform(s)
Linux
