Since merge with jdk-21+5:

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/oracle/valhalla/open/src/hotspot/share/opto/phaseX.cpp:1162), pid=276313, tid=276326
# assert(false) failed: infinite loop in PhaseIterGVN::optimize
#
# JRE version: Java(TM) SE Runtime Environment (21.0) (fastdebug build 21-lworld4ea-LTS-2023-02-06-0803323.tobias...)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 21-lworld4ea-LTS-2023-02-06-0803323.tobias..., mixed mode, tiered, jvmci, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x18348dd] PhaseIterGVN::optimize()+0x55d

Current CompileTask:
C2: 1656 98 b 4 jdk.vm.ci.meta.JavaMethod::format (405 bytes)

Stack: [0x00007fb161eff000,0x00007fb162000000], sp=0x00007fb161ffa670, free space=1005k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x18348dd] PhaseIterGVN::optimize()+0x55d (phaseX.cpp:1162)
V [libjvm.so+0xb56f52] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x6b2 (loopnode.hpp:1185)
V [libjvm.so+0xb506d3] Compile::Optimize()+0xe43 (compile.cpp:2635)
V [libjvm.so+0xb54989] Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x1959 (compile.cpp:842)
V [libjvm.so+0x94716e] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x51e (c2compiler.cpp:113)
V [libjvm.so+0xb61fcc] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xa7c (compileBroker.cpp:2237)
V [libjvm.so+0xb62dd8] CompileBroker::compiler_thread_loop()+0x608 (compileBroker.cpp:1916)
V [libjvm.so+0x10d6876] JavaThread::thread_main_inner()+0x206 (javaThread.cpp:711)
V [libjvm.so+0x1b25a80] Thread::call_run()+0x100 (thread.cpp:224)
V [libjvm.so+0x1797cd3] thread_native_entry(Thread*)+0x103 (os_linux.cpp:739)