Comment 3 for bug 1779955

Thanks Peter for your information.

I was hit by the bug when trying to compile bazel (a build system open-sourced by Google: https://bazel.build) and the code is at https://github.com/bazelbuild/bazel/blob/master/third_party/ijar/mapped_file_unix.cc#L116

Of course I can send PR to fix that in bazel source, but I would say it is not true that "in practice no guest binaries set up memory that is only writable and can't be read". It is legitimate requirement and coding practice.