This is current/arm64 on a RPI3 and RPI4 (dmesgs below). Both basicaly work, but sometimes a process will get killed and I have no idea why. For example, tmux almost always crashes; sometimes e.g. syslogd will get killed on boot; a kernel build needs make to be restarted about ten times, havong had the cc processes killed. There is nothing in dmesg about these kills. Is this known?
The RPI3 has 1GB ram, the RPI4 has 8G, so I don't suppose they lack memory. Both run off a uSD card which can be quite slow, but would that be reason to have a process killed? Jan