Hi Igor,
checksum mismatch in local font cmb10 (-770990554 != -770990554)
This is complaining that a number is not equal to itself, clearly a
representation problem as you describe. I think you should report it,
with your analysis, on tracker.luatex.org. Perhaps it is already fixed
in the current code. The LuaTeX maintainers do not follow tex-k. -k