Having issues with arducopter from both erle's apt repo as well as all the tagged versions 3.4.x or higher compiled from src.
Here is a log sample running erle's provided binary:
Booting and letting it idle eventually results in a seg fault.
Cannot reproduce the problem running it with GDB otherwise I would just post the backtrace.
rp2+, rev0 pxfmini, and frambuesa