https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108994
--- Comment #16 from Tom Stellard <tstellar at redhat dot com> --- I looked into this a little more, and I think the s390x failures may be an LLVM bug. It's trying to JIT an X86 ELF file on s390x, and I think maybe the layout of the frames is different due to endianness. I'm still not sure what's going on with the aarch64 failure, though.