The following tests are unsuited for running in samevm or agentvm mode:

test/javax/security/auth/Subject/Synch.java,
test/javax/security/auth/Subject/Synch3.java

Each of the tests starts a thread that spins forever and this causes all subsequent tests that run in the same VM to run very slowly or timeout.

These tests need to be fixed quickly so that they run in othervm mode. Alternatively a better solution is for the thread to terminate when the test completes.