Currently PPC64 JVM behaves different in comparison to x64 regarding the RTMSpinLoopCount value and does not accept a zero value. As an immediate consequence passing -XX:RTMSpinLoopCount=0 cause JVM to exit by report_and_die():

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# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (vm_version_ppc.cpp:331), pid=32738, tid=32739
# guarantee(RTMSpinLoopCount > 0) failed: unsupported
#
# JRE version: (9.0) (build )
# Java VM: OpenJDK 64-Bit Server VM (9-internal+0-adhoc.gromero.hs, compiled mode, compressed oops, g1 gc, linux-ppc64le)
# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#