`host-sp-comms` failed to get MAC addresses

[mkeeter]

On BRM42220026, IPCC failed to get MAC addresses.

This is a Gimlet C running the stock 1.50 release.

There are a bunch of host_sp_comms crash dumps:

matt@castle ~ $ humility --ip=fe80::aa40:25ff:fe04:341%5 -a build-gimlet-c-image-default.zip dump --list
humility: connecting to fe80::aa40:25ff:fe04:341%5
humility: using UDP dump agent
AREA TASK                  TIME       SIZE
   0 host_sp_comms         114277     31356
   8 host_sp_comms         114357     30812
  16 host_sp_comms         114437     30824
  24 host_sp_comms         114517     30832
  32 host_sp_comms         114597     30816
  40 host_sp_comms         114677     30820
  48 host_sp_comms         114757     30812
  56 host_sp_comms         114837     30808
  64 host_sp_comms         114917     30808

host_sp_comms is apparently being murdered by hf:

matt@castle ~ $ humility -d hubris.core.host_sp_comms.8 tasks
humility: attached to dump
system time = 114917
ID TASK                       GEN PRI STATE
17 host_sp_comms                8   8 FAULT: reply fault: task id #14/gen0, reason BadMessageContents (was: wait: reply from hf/gen0)

This is all weird, more to come (opening the issue now to get a ticket number)