java -Xcomp -XX:CompileOnly=TestSimple::test  -XX:CompileCommand=quiet -XX:-TieredCompilation -XX:+UnlockDiagnosticVMOptions -XX:+StressIGVN -XX:RepeatCompilation=100 TestSimple.java

# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/workspace/open/src/hotspot/share/opto/loopnode.hpp:1137), pid=3339531, tid=3339546
#  assert(n != nullptr) failed: Bad immediate dominator info.
#
# JRE version: Java(TM) SE Runtime Environment (22.0+21) (fastdebug build 22-ea+21-1641)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 22-ea+21-1641, compiled mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0x12babca]  PhaseIdealLoop::clone_loop_handle_data_uses(Node*, Node_List&, IdealLoopTree*, IdealLoopTree*, Node_List*&, Node_List*&, Node_List*&, Node_List&, unsigned int, PhaseIdealLoop::CloneLoopMode)+0xe7a

Current CompileTask:
C2:1896   82    b        TestSimple::test (51 bytes)

Stack: [0x00007fc7a840f000,0x00007fc7a8510000],  sp=0x00007fc7a850a770,  free space=1005k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x12babca]  PhaseIdealLoop::clone_loop_handle_data_uses(Node*, Node_List&, IdealLoopTree*, IdealLoopTree*, Node_List*&, Node_List*&, Node_List*&, Node_List&, unsigned int, PhaseIdealLoop::CloneLoopMode)+0xe7a  (loopnode.hpp:1137)
V  [libjvm.so+0x12bf566]  PhaseIdealLoop::clone_loop(IdealLoopTree*, Node_List&, int, PhaseIdealLoop::CloneLoopMode, Node*)+0x556
V  [libjvm.so+0x126e2dc]  PhaseIdealLoop::insert_post_loop(IdealLoopTree*, Node_List&, CountedLoopNode*, CountedLoopEndNode*, Node*&, Node*, CountedLoopNode*&)+0xdc
V  [libjvm.so+0x127042c]  PhaseIdealLoop::insert_pre_post_loops(IdealLoopTree*, Node_List&, bool)+0x2dc
V  [libjvm.so+0x127f7de]  IdealLoopTree::iteration_split_impl(PhaseIdealLoop*, Node_List&)+0x4be
V  [libjvm.so+0x127fa87]  IdealLoopTree::iteration_split(PhaseIdealLoop*, Node_List&)+0x117
V  [libjvm.so+0x127f9a3]  IdealLoopTree::iteration_split(PhaseIdealLoop*, Node_List&)+0x33
V  [libjvm.so+0x127f9a3]  IdealLoopTree::iteration_split(PhaseIdealLoop*, Node_List&)+0x33
V  [libjvm.so+0x12ab88b]  PhaseIdealLoop::build_and_optimize()+0xe1b
V  [libjvm.so+0x9fdf9b]  PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x3ab
V  [libjvm.so+0x9fa8b2]  Compile::Optimize()+0x16f2
V  [libjvm.so+0x9fc681]  Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x1bc1
V  [libjvm.so+0x849ca7]  C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x207
V  [libjvm.so+0xa08725]  CompileBroker::invoke_compiler_on_method(CompileTask*)+0x9f5
V  [libjvm.so+0xa09438]  CompileBroker::compiler_thread_loop()+0x508
V  [libjvm.so+0xec438c]  JavaThread::thread_main_inner()+0xcc
V  [libjvm.so+0x17a22ca]  Thread::call_run()+0xba
V  [libjvm.so+0x14a710a]  thread_native_entry(Thread*)+0x12a

In product:

# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007efe7295fca6, pid=3339733, tid=3339747
#
# JRE version: Java(TM) SE Runtime Environment (22.0+22) (build 22-ea+22-1754)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (22-ea+22-1754, compiled mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0xbb8ca6]  PhaseIdealLoop::clone_loop_handle_data_uses(Node*, Node_List&, IdealLoopTree*, IdealLoopTree*, Node_List*&, Node_List*&, Node_List*&, Node_List&, unsigned int, PhaseIdealLoop::CloneLoopMode)+0x5e6
#
# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again