Seen only once so far, JDK9 PIT
 Intel Xeon 2301 MHz, 72 cores, 504G, Linux / Oracle Linux 7.0, x86_64

# Internal Error (/scratch/opt/jprt/T/P1/225424.amurillo/s/hotspot/src/share/vm/runtime/thread.cpp:2551), pid=42482, tid=42596
# assert(_stack_guard_state != stack_guard_enabled) failed: already enabled
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (fastdebug build 9-internal+0-2016-03-24-225424.amurillo.jdk9-hs-2016-03-24-snapshot)
# Java VM: Java HotSpot(TM) Server VM (fastdebug 9-internal+0-2016-03-24-225424.amurillo.jdk9-hs-2016-03-24-snapshot, mixed mode, tiered, parallel gc, linux-x86)
# Core dump will be written. Default location: Core dumps may be processed with "/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t e" (or dumping to /export/home/aurora/sandbox/results/ResultDir/stressHierarchy012/core.42482)
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#

--------------- S U M M A R Y ------------

Command Line: -XX:MaxMetaspaceSize=450m -Xss10m -Xbootclasspath/a:/export/home/aurora/CommonData/vm9/lib/wb.jar -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmixed -XX:+UseParallelGC metaspace.stressHierarchy.common.StressHierarchy2 -treeDepth 70 -minLevelSize 10 -maxLevelSize 100 -hierarchyType MIXED -triggerUnloadingByFillingMetaspace

Host: spbfh01.ru.oracle.com, Intel(R) Xeon(R) CPU E5-2699 v3 @ 2.30GHz, 72 cores, 503G, Oracle Linux Server release 7.0
Time: Fri Mar 25 14:21:48 2016 MSK elapsed time: 38 seconds (0d 0h 0m 38s)

--------------- T H R E A D ---------------

Current thread (0x9074a800): JavaThread "pool-1-thread-23" [_thread_in_Java, id=42596, stack(0x7f5ff000,0x80000000)]

Stack: [0x7f5ff000,0x80000000], sp=0x7fffec08, free space=10239k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x1241cd7] VMError::report_and_die(int, char const*, char const*, char*, Thread*, unsigned char*, void*, void*, char const*, int, unsigned int)+0x137
V [libjvm.so+0x1242910] VMError::report_and_die(Thread*, char const*, int, char const*, char const*, char*)+0x30
V [libjvm.so+0x7f9fd0] report_vm_error(char const*, int, char const*, char const*, ...)+0x60
V [libjvm.so+0x11aa405] JavaThread::enable_stack_reserved_zone()+0x1e5
V [libjvm.so+0x10ab761] SharedRuntime::enable_stack_reserved_zone(JavaThread*)+0x91
j java.util.concurrent.locks.AbstractOwnableSynchronizer.setExclusiveOwnerThread(Ljava/lang/Thread;)V+0 java.base@9-internal
j java.util.concurrent.ThreadPoolExecutor$Worker.tryRelease(I)Z+2 java.base@9-internal
j java.util.concurrent.locks.AbstractQueuedSynchronizer.release(I)Z+2 java.base@9-internal
j java.util.concurrent.ThreadPoolExecutor$Worker.unlock()V+2 java.base@9-internal
j java.util.concurrent.ThreadPoolExecutor.runWorker(Ljava/util/concurrent/ThreadPoolExecutor$Worker;)V+15 java.base@9-internal
j java.util.concurrent.ThreadPoolExecutor$Worker.run()V+5 java.base@9-internal
j java.lang.Thread.run()V+11 java.base@9-internal
v ~StubRoutines::call_stub
V [libjvm.so+0xaee72c] JavaCalls::call_helper(JavaValue*, methodHandle const&, JavaCallArguments*, Thread*)+0x73c
V [libjvm.so+0xf5f9f9] os::os_exception_wrapper(void (*)(JavaValue*, methodHandle const&, JavaCallArguments*, Thread*), JavaValue*, methodHandle const&, JavaCallArguments*, Thread*)+0x19
V [libjvm.so+0xaec2d9] JavaCalls::call_virtual(JavaValue*, KlassHandle, Symbol*, Symbol*, JavaCallArguments*, Thread*)+0x2c9
V [libjvm.so+0xaec42e] JavaCalls::call_virtual(JavaValue*, Handle, KlassHandle, Symbol*, Symbol*, Thread*)+0x8e
V [libjvm.so+0xc09b47] thread_entry(JavaThread*, Thread*)+0xa7
V [libjvm.so+0x11b4fa3] JavaThread::thread_main_inner()+0x1d3
V [libjvm.so+0x11b5238] JavaThread::run()+0x1f8
V [libjvm.so+0xf62c14] java_start(Thread*)+0x104
C [libpthread.so.0+0x6b2c] start_thread+0xcc
C [libc.so.6+0xf75ae] clone+0x5e