nginx and FreeBSD11

[Slawa Olhovchenkov]

I am have strange issuse with nginx on FreeBSD11.
I am have FreeBSD11 instaled over STABLE-10.
nginx build for FreeBSD10 and run w/o recompile work fine.
nginx build for FreeBSD11 crushed inside rbtree lookups: next node
totaly craped.

I am see next potential cause:

1) clang 3.8 code generation issuse
2) system library issuse

may be i am miss something?

How to find real cause?