Its probably the ram plentiful thing. I haven't looked recently into if the Arch mainline kernel kconfig is just bad or not but the oomkiller is trash for me. Used to have the "recommended" swap == ram size but then the memory manager never even tried to cull pages until it was OOM and froze up trying to swap constantly. Currently running a 16/4 spread and probably going to drop to 16/1 because any time I hit memory limits everything just freezes permanently rather than the oomkiller getting invoked. I've hit it twice this week trying to render in Kdenlive and run a debug build of Krita...