Yesterday, while completing some of our AMPS units with display and Qt application, we encountered an error that caused the application to fail to launch correctly and crash in rare cases. The error looks like this:

When compiling Qt 5.15.2 from the official open source sources, we encountered a problem in combination with our build server: The build process was interrupted while compiling the Chromium-based “WebEngine” component with initially mysterious error messages. A look at the kernel log using dmesg -w then quickly revealed that the so-called OOM killer of the Linux kernel had struck. Apparently the RAM consumption of the build process was so memory-intensive that the process had to be aborted to keep the operating system running.