above is basically right with a couple clarifications. It's not so much that the arena object being destroyed is the issue; in fact that in itself would be handled gracefully by SHM-jemalloc innards; they will keep the arena around, even if the outer object goes away (or more precisely as of this writing the arena-handle &ndash; a <code>shared_ptr</code> &ndash; does), while it knows things are pointing into it, even borrowed things in another process. Really it's the fact that we kill the <em>channel</em> 