JDK-8191278 added a runtime/Unsafe/InternalErrorTest.java test to verify that SIGBUS during Unsafe copy is converted into the exception. Zero currently crashes this test on ShouldNotCall() in signal handler:

# Internal Error (/home/shade/trunks/jdk/src/hotspot/os_cpu/linux_zero/os_linux_zero.cpp:155), pid=2752575, tid=2752589
# Error: ShouldNotCall()

It is unlikely that Zero would implement this functionality, so it seems prudent to disable the test to get clean tier1 for Zero.