ZGC core files are very large on OSX (see
JDK-8268722), and this is causing a problem for SA core file testing. On most of our 10.x machines, the host simply runs out of memory and the test task fails. On 11.x, we are seeing hosts frequently get into a bad state, and suspect these large core files might have something to do with that. See JDK-8267433 and JDK-8265037.