@modaltb I see. It's good to know the story
If 22027 is the default one, it will be all right.
To be honest, I didn't touch the CBRK_IO_SAFETY before, and it's a bit weird why it was automatically modified for some reason.
Actually, I was trying to refresh a re-compiled 1.11.3-0.2.3 with my modification (increasing GPS log rate). So, I guess it might reset the value to 0 by PX4 default.
Anyways, thanks so much!