Raspberry Pi 4

I am unable to find that line in dmesg. I have never got any messages from linuxcnc in the system log file.
It is the rtapi_app that crashes. I have looked at it with strace and the last system command is "accept"
then crash. Intended to attach to rtapi_app with gdb, it should take me to the failing part upon crash.
But not succesful

gdb-debugging the realtime layer is tricky. It might be possible with preempt-rt but it is basically impossible with RTAI.

Did you make the makefile changes and recompile LinuxCNC? You won't see the ip without that.
I have only ever used that approach with RTAI, it is possible that is does not work with preempt-rt as the LinuxCNC modules are not kernel modules.

Another question: You said that you compiled the preempt-rt kernel? I did the same last night (4.19.58) and whilst it boots I seem to have lost the WiFi and Bluetooth drivers. Did you have this problem? Did you find a solution?

RPI3 with realtime kernel looses connectivity also, eth works.

tommylight wrote: RPI3 with realtime kernel looses connectivity also, eth works.

Is that with a self-compiled kernel, or a third-party released one?

With both, but i do not know the version i compiled then, i can get the verion i have now as it is the machinekit image, 2 years old.