Undefined Behavior discovered after turning "UndefinedBehaviorSanitizer" in Xcode running simple HelloWorld java app. More info on clang undefined behavior sanitizer can be found https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html

/Users/gerard/Work/tmp/jdk/src/hotspot/share/opto/compile.cpp:2977 Upcast of misaligned address 0x0000deadbeef for type 'PhaseChaitin', which requires 8 byte alignment

Misaligned pointer use
#0 0x0000000111c25f87 in Compile::Code_Gen() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/opto/compile.cpp:2977
#1 0x0000000111c26563 in Compile::Compile(ciEnv*, TypeFunc const* (*)(), unsigned char*, char const*, int, bool, bool, DirectiveSet*) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/opto/compile.cpp:957
#2 0x0000000111ceb407 in OptoRuntime::generate_stub(ciEnv*, TypeFunc const* (*)(), unsigned char*, char const*, int, bool, bool) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/opto/runtime.cpp:175
#3 0x0000000111ceb093 in OptoRuntime::generate(ciEnv*) at /Users/gerard/Work/tmp/jdk/src/hotspot/share/opto/runtime.cpp:143
#4 0x0000000111cad217 in C2Compiler::init_c2_runtime() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/opto/c2compiler.cpp:82
#5 0x0000000111cad2cf in C2Compiler::initialize() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/opto/c2compiler.cpp:95
#6 0x0000000111e8437b in CompileBroker::init_compiler_runtime() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/compiler/compileBroker.cpp:1730
#7 0x0000000111e8504f in CompileBroker::compiler_thread_loop() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/compiler/compileBroker.cpp:1867
#8 0x0000000110eed6cb in JavaThread::thread_main_inner() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/runtime/javaThread.cpp:710
#9 0x0000000110eed4bb in JavaThread::run() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/runtime/javaThread.cpp:695
#10 0x0000000110d9837b in Thread::call_run() at /Users/gerard/Work/tmp/jdk/src/hotspot/share/runtime/thread.cpp:224
#11 0x00000001109abd1f in thread_native_entry(Thread*) at /Users/gerard/Work/tmp/jdk/src/hotspot/os/bsd/os_bsd.cpp:572
#12 0x00000001000995d3 in _pthread_start ()