This is a followup to milestone 16 (https://github.com/shadow/shadow/milestone/16) where we are tracking what is needed for a minimum viable prototype of process-based simulation architecture. This milestone is for issues that need to be addressed to fully support the architecture, but are not necessary for the minimum viable prototype. In particular, we are using a recompiled glibc for the minimum viable prototype, but would like to avoid that for "full" support of the new architecture.