* thread #9, stop reason = signal SIGSTOP
  * frame #0: 0x00007fff715fdb6e libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff717c8080 libsystem_pthread.dylib`pthread_kill + 333
    frame #2: 0x00007fff715591ae libsystem_c.dylib`abort + 127
    frame #3: 0x000000010e7bedb2 libjvm.dylib`os::abort(dump_core=<unavailable>, siginfo=<unavailable>, context=<unavailable>) at os_bsd.cpp:1069 [opt]
    frame #4: 0x000000010e9d69d1 libjvm.dylib`VMError::report_and_die(id=-536870912, message="assert(!h->is_gc_active()) failed", detail_fmt="GC active during NoGCVerifier", detail_args=0x000070000bf9ca60, thread=0x00007fdb21037000, pc=0x0000000000000000, siginfo=0x0000000000000000, context=0x0000000000000000, filename="/scratch/mesos/slaves/07fc96ef-bf4d-487f-b22f-a84e49f5f44a-S133447/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/1c28d8f3-64cc-4a36-9988-59dc7df8daaf/runs/e6edd635-7766-4aa7-883c-98b4f726b22f/workspace/open/src/hotspot/share/runtime/safepointVerifiers.cpp", lineno=48, size=0) at vmError.cpp:1571 [opt]
    frame #5: 0x000000010e9d6bf5 libjvm.dylib`VMError::report_and_die(thread=<unavailable>, context=0x0000000000000000, filename=<unavailable>, lineno=<unavailable>, message=<unavailable>, detail_fmt=<unavailable>, detail_args=0x000070000bf9ca60) at vmError.cpp:1287 [opt]
    frame #6: 0x000000010e202802 libjvm.dylib`report_vm_error(file="/scratch/mesos/slaves/07fc96ef-bf4d-487f-b22f-a84e49f5f44a-S133447/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/1c28d8f3-64cc-4a36-9988-59dc7df8daaf/runs/e6edd635-7766-4aa7-883c-98b4f726b22f/workspace/open/src/hotspot/share/runtime/safepointVerifiers.cpp", line=48, error_msg="assert(!h->is_gc_active()) failed", detail_fmt="GC active during NoGCVerifier") at debug.cpp:264 [opt]
    frame #7: 0x000000010e87ed36 libjvm.dylib`NoGCVerifier::~NoGCVerifier(this=0x000070000bf9cae0) at safepointVerifiers.cpp:48 [opt]
    frame #8: 0x000000010e8b911a libjvm.dylib`StringDedupTable::deduplicate(oop, StringDedupStat*) [inlined] NoSafepointVerifier::~NoSafepointVerifier(this=0x000000010ed48208) at safepointVerifiers.hpp:99 [opt]
    frame #9: 0x000000010e8b9115 libjvm.dylib`StringDedupTable::deduplicate(java_string=<unavailable>, stat=0x000070000bf9cc70) at stringDedupTable.cpp:380 [opt]
    frame #10: 0x000000010e8ba2db libjvm.dylib`StringDedupSharedClosure::do_oop(this=0x000070000bf9cc50, p=<unavailable>) at stringDedupThread.cpp:65 [opt]
    frame #11: 0x000000010e8bd6e1 libjvm.dylib`StringTable::shared_oops_do(OopClosure*) [inlined] SharedStringIterator::do_value(string=oop @ 0x000070000bf9cc08) at stringTable.cpp:813 [opt]
    frame #12: 0x000000010e8bd6d5 libjvm.dylib`StringTable::shared_oops_do(OopClosure*) at compactHashtable.hpp:294 [opt]
    frame #13: 0x000000010e8bd644 libjvm.dylib`StringTable::shared_oops_do(f=0x000070000bf9cc50) at stringTable.cpp:819 [opt]
    frame #14: 0x000000010e8ba221 libjvm.dylib`StringDedupThread::deduplicate_shared_strings(this=<unavailable>, stat=<unavailable>) at stringDedupThread.cpp:75 [opt]
    frame #15: 0x000000010e34d0db libjvm.dylib`StringDedupThreadImpl<G1StringDedupStat>::do_deduplication(this=0x00007fdb21037000) at stringDedupThread.inline.hpp:36 [opt]
    frame #16: 0x000000010e19f1ed libjvm.dylib`ConcurrentGCThread::run(this=0x00007fdb21037000) at concurrentGCThread.cpp:50 [opt]
    frame #17: 0x000000010e95153f libjvm.dylib`Thread::call_run(this=0x00007fdb21037000) at thread.cpp:400 [opt]
    frame #18: 0x000000010e7be456 libjvm.dylib`thread_native_entry(thread=0x00007fdb21037000) at os_bsd.cpp:694 [opt]
    frame #19: 0x00007fff717c5661 libsystem_pthread.dylib`_pthread_body + 340
    frame #20: 0x00007fff717c550d libsystem_pthread.dylib`_pthread_start + 377
    frame #21: 0x00007fff717c4bf9 libsystem_pthread.dylib`thread_start + 13