PX4 FMU Reboot After Module Start - How To Log Error

Hi everyone,

I’ve compiled a custom firmware version for the PX4 and I’ve flashed it onto the controller.
Now when I try to launch the module in the MAVLink Console with >>module<< start the FMU reboots (red B/E light) and the MAVLink Console freezes.
After about 5 s the initial boot message appears in the MAVLink Console so I think the PX4 died and rebooted.

Now I have no clue on how to log the error which caused the problem since the console freezes immediately after the >>module<< start command.
Do you have any idea on how to find the error message?

All the Best,