How to get anything useful out of kgdb?

[Sean Bruno]

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tl;dr  What are the kernel config options to get good output of kgdb?


I'm trying to get the ability to debug and display internal variables,
as one does, with kgdb.  I'm *must* be doing this wrong as I cannot get
any useful output from accessing variables that were JUST accessed in
order to invoke a panic() that I have inserted.  This is a GENERIC
kernel without INVARIANTS and without WITNESS:

https://people.freebsd.org/~sbruno/wtf_kgdb.txt

I seem to have debug enabled and am able to browse source, but I
obviously haven't compiled correctly as things are optimized out.

sean
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