Github user jacksontj commented on the pull request:
https://github.com/apache/trafficserver/pull/521#issuecomment-195071103
I don't think this should land. If you look above there is already a check
if the item is round robin (`if (r->round_robin) {`) so this check would
basically just be checking if the item is malformed, not actually doing a real
check. If this does stop your crash from happening, that means there is an
entry in hostdb that has `round_robin` and no `rr`-- so that does narrow down
the problem quite a bit.
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