We had one of the VCSes raise an alarm a few days ago that reads as follows:
An unexpected software error was detected in ivy: SIGABRT (tkill(2) or tgkill(2))
A closer look into details reveals the following:
|Stack||0x0000000000c2c407 RxPLIManager ppcmains/ivy/b2bua/offeranswer/sdp/RxPLIManager.cpp:54
Cisco has confirmed that it is a new bug with X8.1.1. The application automatically restarts, so there is no need to do anything other than acknowledge the alarm for the notice to go away.