While 5.0.0 worked fine on my PowerMac G4, 5.0 + git (unknown rev as of Mar 13), 5.0.0-11520-gf261c4e and todays git all fail to boot.
The problem seems to be in page fault handler in load_elf_binary() of init process.
The patch at https://patchwork.ozlabs.org/patch/1053385/ should fix it