java -XX:CompileCommand=quiet -XX:CompileCommand=compileonly,*Test*::* -Xcomp Test_1681.java

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (workspace/open/src/hotspot/share/opto/phaseX.hpp:308), pid=594807, tid=594875
# assert(_types[n->_idx] == nullptr) failed: must set the initial type just once
#
# JRE version: Java(TM) SE Runtime Environment (25.0+9) (fastdebug build 25-ea+9-LTS-958)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 25-ea+9-LTS-958, compiled mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x15dd618] PhaseIterGVN::transform(Node*)+0x158

Current CompileTask:
C2:8348 161 b 4 Test_1681::method_double_double_218 (825 bytes)

Stack: [0x0000707bda300000,0x0000707bda400000], sp=0x0000707bda3fa5d0, free space=1001k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x15dd618] PhaseIterGVN::transform(Node*)+0x158 (phaseX.hpp:308)
V [libjvm.so+0x1424efc] step_through_mergemem(PhaseGVN*, MergeMemNode*, TypePtr const*, TypePtr const*, outputStream*)+0x9c
V [libjvm.so+0x14252b4] MemNode::optimize_simple_memory_chain(Node*, TypeOopPtr const*, Node*, PhaseGVN*)+0x1b4
V [libjvm.so+0x142583e] MemNode::optimize_memory_chain(Node*, TypePtr const*, Node*, PhaseGVN*)+0x2e
V [libjvm.so+0x142678b] LoadNode::split_through_phi(PhaseGVN*, bool)+0xb4b
V [libjvm.so+0xc2b1b0] ConnectionGraph::reduce_phi_on_field_access(Node*, GrowableArray<Node*>&)+0xc0
V [libjvm.so+0xc2d2ef] ConnectionGraph::reduce_phi(PhiNode*, GrowableArray<Node*>&, GrowableArray<Node*>&)+0x66f
V [libjvm.so+0xc30b6b] ConnectionGraph::split_unique_types(GrowableArray<Node*>&, GrowableArray<ArrayCopyNode*>&, GrowableArray<MergeMemNode*>&, Unique_Node_List&)+0x5fb
V [libjvm.so+0xc3ba15] ConnectionGraph::compute_escape()+0x21d5
V [libjvm.so+0xc3c101] ConnectionGraph::do_analysis(Compile*, PhaseIterGVN*)+0xe1
V [libjvm.so+0xa54ae8] Compile::Optimize()+0x848
V [libjvm.so+0xa58cdf] Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x1b9f
V [libjvm.so+0x8a4125] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x1d5
V [libjvm.so+0xa654a8] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x928
V [libjvm.so+0xa661e8] CompileBroker::compiler_thread_loop()+0x528
V [libjvm.so+0xf2ac3e] JavaThread::thread_main_inner()+0xee
V [libjvm.so+0x187f486] Thread::call_run()+0xb6
V [libjvm.so+0x15579f8] thread_native_entry(Thread*)+0x128