itests pass successfully but then hang for 30 seconds with an error #1093
Description
I think I'm seeing PAXEXAM-920 re-surface when upgrading maven-failsafe-plugin from 2.22.2 to 3.1.2 (running in Karaf 4.4.4, Pax Exam 4.13.3, OpenJDK 11.0.20.1+1, Linux). With 2.22.2 all is fine, and after changing to 3.1.2, for some application itests, the tests pass successfully but then hang for 30 seconds and the console shows
[ERROR] Surefire is going to kill self fork JVM. The exit has elapsed 30 seconds after System.exit(0).
I haven't fully analyzed what's going on, though it seems the forked JVM has no application threads left running, and the only non-daemon thread is the main one stuck waiting for an ack for a bye command or something like that. Sounds very similar to the original issue description...