In Wireshark 2.2.0 to 2.2.1, the Profinet I/O dissector could loop excessively, triggered by network traffic or a capture file. This was addressed in plugins/profinet/packet-pn-rtc-one.c by rejecting input with too many I/O objects.
https://www.wireshark.org/security/wnpa-sec-2016-58.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=12851