Error on launch: child exited on signal 11

[goeland86]

I'm fairly new at this, and hoping to use the simulator so that I can test serial-port command streams without needing to be physically tethered to a machine.

I've tried both compiling with cmake myself, and the web-builder's binary, both cause the same issue.
I'm on Mint 21.3 (recent switch from Ubuntu), and I may have some permissions missing. If I run the given socat command as described in the README, I get a "permission denied" when attempting to create the /dev/ttyGRBL port.

When I run the same command with sudo, I get the following output (with a changing child process ID):

john@Eitri:~/tools/Grblhal-sim$ sudo socat PTY,raw,link=/dev/ttyGRBL,echo=0,group-late=dialout,mode=660 "EXEC:'./grblHAL_sim -n -s step.out -b block.out',pty,raw,echo=0" 
2024/03/02 21:02:34 socat[6196] E waitpid(): child 6197 exited on signal 11

Any idea what could be causing this?