It seems udev >=062 fails for unknown reasons on sparc64. End result is a Bus Error, which means it could be everything from lose wires to Acts of God. 060 seems to work, however. I've attached a strace dump, but if any more data for debugging is needed, let me know. Gonna strip sparc keywords from those releases for the time being, as they'll kill booting on machines with them installed.
Created attachment 63588 [details] strace output of udevstart on sparc64
Fixed in 064 release.