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