FreeBSD 11 beta4, board Raspberry 2, armv6. Zebra process falls ("Abort trap") when start after compiling with system clang. When compiling with gcc (gcc-5.3/5.4) is working properly, ospfd/ospf6d/bgpd also start properly. Small research showed that bug may be around reading/installation routes in the kernel.
It seems to work when compiled with WITH_DEBUG=yes
I no longer use quagga.
I'm going to close this due to https://cgit.freebsd.org/ports/commit/?id=d496ebd9a5de472c99f36179cbef35079ee0c9a4