https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67198
--- Comment #2 from boger at us dot ibm.com --- I was asked to make this fix to gccgo. A corresponding Docker fix is needed which is described here https://github.com/docker/libcontainer/pull/625. It is unfortunate it introduces an incompatibility which means that new Docker source can't be built with older gccgo compilers, but this is a bug and could lead to incorrect execution. It is assuming the field is signed when it should be treated as unsigned.
