I found this when disabling preloading for stress testing.

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/oracle/valhalla/open/src/hotspot/share/opto/compile.cpp:1709), pid=3361040, tid=3361057
# assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr: adr_type = null+24
#
# JRE version: Java(TM) SE Runtime Environment (25.0) (fastdebug build 25-lworld5ea-LTS-2025-05-22-1214417.tobias...)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 25-lworld5ea-LTS-2025-05-22-1214417.tobias..., mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xb355ec] Compile::find_alias_type(TypePtr const*, bool, ciField*, bool) [clone .part.0]+0x30c

Current CompileTask:
C2:2892 1457 b 4 compiler.valhalla.inlinetypes.TestArrays::test152 (22 bytes)

Stack: [0x000079e9bb000000,0x000079e9bb100000], sp=0x000079e9bb0fa880, free space=1002k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xb355ec] Compile::find_alias_type(TypePtr const*, bool, ciField*, bool) [clone .part.0]+0x30c (compile.cpp:1709)
V [libjvm.so+0x1559d5c] PhaseIdealLoop::get_late_ctrl_with_anti_dep(LoadNode*, Node*, Node*)+0x4c (compile.hpp:978)
V [libjvm.so+0x155b4d1] PhaseIdealLoop::get_late_ctrl(Node*, Node*)+0xf1 (loopnode.cpp:6075)
V [libjvm.so+0x155b720] PhaseIdealLoop::build_loop_late_post_work(Node*, bool)+0x210 (loopnode.cpp:6463)
V [libjvm.so+0x155d73a] PhaseIdealLoop::build_loop_late(VectorSet&, Node_List&, Node_Stack&)+0x17a (loopnode.cpp:6351)
V [libjvm.so+0x155e0af] PhaseIdealLoop::build_and_optimize()+0x71f (loopnode.cpp:4751)
V [libjvm.so+0xb5ab10] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x4c0 (loopnode.hpp:1162)
V [libjvm.so+0xb543f8] Compile::Optimize()+0x748 (compile.cpp:2937)
V [libjvm.so+0xb57bff] Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x1fef (compile.cpp:874)
V [libjvm.so+0x96de74] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x484 (c2compiler.cpp:142)
V [libjvm.so+0xb658b8] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xb58 (compileBroker.cpp:2307)
V [libjvm.so+0xb66a78] CompileBroker::compiler_thread_loop()+0x568 (compileBroker.cpp:1951)
V [libjvm.so+0x10e0bbb] JavaThread::thread_main_inner()+0x13b (javaThread.cpp:774)
V [libjvm.so+0x1b5a746] Thread::call_run()+0xb6 (thread.cpp:231)
V [libjvm.so+0x17c63f8] thread_native_entry(Thread*)+0x128 (os_linux.cpp:875)


# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/oracle/valhalla/open/src/hotspot/cpu/x86/macroAssembler_x86.cpp:446), pid=3361353, tid=3361357
# fatal error: DEBUG MESSAGE: dead path discovered by TypeNode during igvn
#
# JRE version: Java(TM) SE Runtime Environment (25.0) (fastdebug build 25-lworld5ea-LTS-2025-05-22-1214417.tobias...)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 25-lworld5ea-LTS-2025-05-22-1214417.tobias..., mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x15b3705] MacroAssembler::debug64(char*, long, long*)+0x45

V [libjvm.so+0x15b3705] MacroAssembler::debug64(char*, long, long*)+0x45 (macroAssembler_x86.cpp:446)
J 1439 c2 compiler.valhalla.inlinetypes.TestArrays.test153()Lcompiler/valhalla/inlinetypes/TestArrays$MyValue153; (22 bytes) @ 0x00007bb660c2c5dd [0x00007bb660c2c5a0+0x000000000000003d]
j compiler.valhalla.inlinetypes.TestArrays.test153_verifier()V+1
j java.lang.invoke.LambdaForm$DMH+0x00000000390a8000.invokeVirtual(Ljava/lang/Object;Ljava/lang/Object;)V+10 java.base
j java.lang.invoke.LambdaForm$MH+0x000000003910ac00.invoke(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;+35 java.base
J 1438 c1 jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; java.base (92 bytes) @ 0x00007bb659220984 [0x00007bb65921f120+0x0000000000001864]
J 1437 c1 java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; java.base (108 bytes) @ 0x00007bb65921ee14 [0x00007bb65921e820+0x00000000000005f4]
j compiler.lib.ir_framework.test.CustomRunTest.invokeTest()V+49
j compiler.lib.ir_framework.test.AbstractTest.run()V+37
j compiler.lib.ir_framework.test.CustomRunTest.run()V+59
j compiler.lib.ir_framework.test.TestVM.runTests()V+198
j compiler.lib.ir_framework.test.TestVM.start()V+9
j compiler.lib.ir_framework.test.TestVM.main([Ljava/lang/String;)V+38
v ~StubRoutines::call_stub 0x00007bb660460001