Hello, for what it's worth I've been having the same issue, although I followed a different installation procedure.
First, I installed the linuxcnc 2.9.2 iso. Then, I wanted to apt update and upgrade the system, but it gave me some errors related to raspi-firmware, but I solved it following
another post
. Next, I installed the packages on the downloads page (linuxcnc for RTAI, RTAI kernel and RTAI modules) and installed them with gdebi, having previously removed the linuxcnc-uspace package and the documentation.
Once everything is installed I reboot the system but during boot I see that the systemd-binfmt.service fails to load up properly.
Finally, when I launch some Stepconf generated linuxcnc instance, it crashes with the same segmentation fault as yours.
However, when I go to LinuxCNC Configuration Selector and load the Sample Configuration of axis it loads up perfectly.
I will keep looking for solutions, although I believe that the crash is related to the binfmt service not working properly.
