freebsd stable - May 2017 - 11-STABLE: vm_radix_remove: invalid key found panic

So I logged https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219070
about a panic occurring with vm_radix_remove: invalid key found panic

I need some help debugging this, because it has been ages since I did any
decent kernel debugging.

Especially with regard to the values that are optimized out as well as this
subsystem, I am not entirely sure what to focus on first. I would imagine I
want to go from frame 13 and check all the data structures for sanity.

-- 
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
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