I play Cult Of The Lamb with mouse and keyboard and the Crusades (basically sequences of fighting arenas) tend to be kinda insane in terms of the intensity with which you have to use them, so it makes total sense.

By the way, thanks for the very complete explanation.

My gut feeling told me it was some kind of memory leak (because those things tend to manifest themselves after some time of using the software, with some randomness on how long it takes for it to happen) but when I looked around I couldn’t find an explanation of its mechanism.

By the way the suggested workaround of adding LD_PRELOAD=“” in the Launch Options for the game seems to work.

Maybe the way those input capture layers work is by putting their input handling methods ahead of the default ones via LD_PRELOAD and forcing LD_PRELOAD to be empty means they’re not in the input processing pathway anymore?! (In all fairness, I can’t be arsed to dive into that codebase ;))