You might want to configure your system with some swap space (at least equal to the memory size), and ensure /var/crash contains free space at least equal to the system memory.
If this is true ( and you have not disabled core dumping in rc.conf), FreeBSD will save a core dump when it panics, and you will be able to get a backtrace, like this:
# kgdb /boot/kernel/kernel /var/crash/vmcore.0
> bt
Although fully understanding backtraces is a fairly advanced science, they can often tell even a novice where the problems are.
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