ValueOopsMVT test crashes with -XX:-ValueArrayFlatten because C2 removes the array initialization code of an unused array while the array is still allocated and processed by the GC:

#  Internal Error (/oracle/valhalla/src/hotspot/share/oops/oop.inline.hpp:319), pid=23668, tid=23671
#  assert(check_obj_alignment(result)) failed: address not aligned: 0x00000000baadbabe

Stack: [0x00007f1fece3c000,0x00007f1fecf3c000],  sp=0x00007f1fecf398f0,  free space=1014k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x17b535c]  VMError::report_and_die(int, char const*, char const*, __va_list_tag*, Thread*, unsigned char*, void*, void*, char const*, int, unsigned long)+0x18c
V  [libjvm.so+0x17b617f]  VMError::report_and_die(Thread*, char const*, int, char const*, char const*, __va_list_tag*)+0x2f
V  [libjvm.so+0xb5a8d2]  report_vm_error(char const*, int, char const*, char const*, ...)+0x112
V  [libjvm.so+0xa02432]  oopDesc::decode_heap_oop_not_null(unsigned int)+0xd2
V  [libjvm.so+0xa0419c]  void ExtendedOopClosure::verify<unsigned int>(unsigned int*)+0x6c
V  [libjvm.so+0xde334b]  void ObjArrayKlass::oop_oop_iterate<true, FastScanClosure>(oop, FastScanClosure*)+0x13b
V  [libjvm.so+0xdd7fb1]  ObjArrayKlass::oop_oop_iterate_nv(oop, FastScanClosure*)+0x41
V  [libjvm.so+0x15fbb81]  ContiguousSpace::oop_since_save_marks_iterate_nv(FastScanClosure*)+0x111
V  [libjvm.so+0xb6b6c3]  DefNewGeneration::oop_since_save_marks_iterate_nv(FastScanClosure*)+0x43
V  [libjvm.so+0xdce81d]  GenCollectedHeap::oop_since_save_marks_iterate(GenCollectedHeap::GenerationType, FastScanClosure*, FastScanClosure*)+0x3d
V  [libjvm.so+0xb6ecec]  DefNewGeneration::collect(bool, bool, unsigned long, bool)+0x56c
V  [libjvm.so+0xdd08d0]  GenCollectedHeap::collect_generation(Generation*, bool, unsigned long, bool, bool, bool, bool)+0x350
V  [libjvm.so+0xdd2017]  GenCollectedHeap::do_collection(bool, bool, unsigned long, bool, GenCollectedHeap::GenerationType)+0x347
V  [libjvm.so+0xa72f8d]  GenCollectorPolicy::satisfy_failed_allocation(unsigned long, bool)+0xed
V  [libjvm.so+0x17b6c1c]  VM_GenCollectForAllocation::doit()+0xdc
V  [libjvm.so+0x17f13a8]  VM_Operation::evaluate()+0x218
V  [libjvm.so+0x17ed6ea]  VMThread::evaluate_operation(VM_Operation*)+0x11a
V  [libjvm.so+0x17ee5c4]  VMThread::loop()+0x2e4
V  [libjvm.so+0x17eee0f]  VMThread::run()+0xcf
V  [libjvm.so+0x14257aa]  thread_native_entry(Thread*)+0xfa