I have a dumb but simple fix.
This will make the apply_alternatives a nop function which will not
replace the barriers.
however the orginal barrier funcitions will still be in place.
Apply this patch after the error and rebuild.
when does the arch/um/sys-i386/module.c function get copied into
My build process has not replaced it yet, but it is copied in since it
is not in a freshly patched kernel