Boot fails on 3.1-4.3.3-201512151908

Hallo,
I get a crash with Gentoo hardened sources 4.3.3 (which is uses grsecurity-3.1-4.3.3-201512151908.patch):

Any hints where to start debugging?
I get a crash with Gentoo hardened sources 4.3.3 (which is uses grsecurity-3.1-4.3.3-201512151908.patch):

Any hints where to start debugging?