Machine : amd64
relay_statistics in relay.c runs on a timer that isn't synchronized with
config reload. pfe_dispatch_relay in pfe.c fails periodically with
"invalid relay id" and exits prematurely.
Run relayctl reload periodically until crash occurs.
Below is a patch that fixes the issue in at least one way. I'm also
seeing other spurious issues with connections so there may be
other issues during config reload.