"ping6 -c1 <unresponsive host>" now never terminates. It just sits there forever waiting for a reply. This behavior is new with r269800 in 10-STABLE. Previously, ping6 would exit if there was no reply within about a second.
Fixed in r272871 and merged into 10.2-RELEASE.
Fixed by hrs@ in the following commit: ------------------------------------------------------------------------ r271909 | hrs | 2014-09-20 11:48:50 -0700 (Sat, 20 Sep 2014) | 5 lines Revert changes in r269180. It could cause -c N option to enter an infinite loop if no reply packet is received. PR: 151023