mdadm: segfaults on creation, assembly of raid member

[BigSleezy00]

Using snapshot on x86/64. Newest build- SNAPSHOT (r26043-1991bfb814).

Whenever I try to build a new raid member or reassemble one from another OS, I always get a segfault. Verified drives are good, with finnix, where I built a new array and then tried mdadm on openwrt. No joy. I'm not sure what direction to go. Ideas?

mdadm --create /dev/md0 --chunk=64 -l 0 -n 2 /dev/sda /dev/sdc
[ 1303.479034] mdadm[4550]: segfault at 366fef3c IP 00007f98c6f3f252.... error 4 in libc.so []7f98c6efa000+54000] likely on CPU 7 (core 3, socket 0)
...
segmentation fault