[ppc64] internal error g1BarrierSet.inline.hpp assert(oopDesc::is_oop(pre_val, true)) failed: Error

We got an assertion in our fastdebug nightly build, probably related to https://bugs.openjdk.org/browse/JDK-8292077 , on Linux ppc64le .

Command Line in the build where the assertion happens is : -Xms64M -Xmx1600M --add-exports=java.base/jdk.internal.module=ALL-UNNAMED build.tools.jigsaw.AddPackagesAttribute /nb/linuxppc64le/jdk-dev-build-fastdebug/jdk

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/g1BarrierSet.inline.hpp:39
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/nb/linuxppc64le/jdk-dev/src/hotspot/share/gc/g1/g1BarrierSet.inline.hpp:39), pid=27195, tid=27200
# assert(oopDesc::is_oop(pre_val, true)) failed: Error
#
# JRE version: OpenJDK Runtime Environment (20.0) (fastdebug build 20-internal-adhoc.openjdk.jdk-dev)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 20-internal-adhoc.openjdk.jdk-dev, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-ppc64le)
# Problematic frame:
# V [libjvm.so+0xc5532c] G1BarrierSet::enqueue_preloaded(oop)+0x28c
 
backtrace and registers of the assertion are :

Stack: [0x0000100002890000,0x0000100002a90000], sp=0x0000100002a8ca50, free space=2034k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xc5532c] G1BarrierSet::enqueue_preloaded(oop)+0x28c
V [libjvm.so+0xc4127c] G1CollectedHeap::keep_alive(oop)+0x4c
V [libjvm.so+0x5266ac] BarrierSetNMethod::nmethod_entry_barrier(nmethod*)::OopKeepAliveClosure::do_oop(oop*)+0xac
V [libjvm.so+0x1547b84] nmethod::oops_do(OopClosure*, bool)+0x84
V [libjvm.so+0x526d58] BarrierSetNMethod::nmethod_stub_entry_barrier(unsigned char**)+0xf8
v ~StubRoutines::nmethod_entry_barrier 0x000010000f4a6598
J 99 c1 java.lang.CharacterData.of(I)Ljava/lang/CharacterData; java.base (136 bytes) @ 0x000010000802ae34 [0x000010000802ae00+0x0000000000000034]
j java.lang.Character.isJavaIdentifierPart(I)Z+1 java.base
j jdk.internal.module.Checks.isJavaIdentifier(Ljava/lang/String;)Z+56 java.base
j jdk.internal.module.Checks.requireTypeName(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;+56 java.base
j jdk.internal.module.Checks.requireQualifiedClassName(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;+2 java.base
j jdk.internal.module.Checks.requireServiceTypeName(Ljava/lang/String;)Ljava/lang/String;+3 java.base
j java.lang.module.ModuleDescriptor$Builder.uses(Ljava/lang/String;)Ljava/lang/module/ModuleDescriptor$Builder;+22 java.base
j jdk.internal.module.ModuleInfo.readModuleAttribute(Ljava/io/DataInput;Ljdk/internal/module/ModuleInfo$ConstantPool;I)Ljava/lang/module/ModuleDescriptor$Builder;+1018 java.base
j jdk.internal.module.ModuleInfo.doRead(Ljava/io/DataInput;)Ljdk/internal/module/ModuleInfo$Attributes;+542 java.base
j jdk.internal.module.ModuleInfo.read(Ljava/io/InputStream;Ljava/util/function/Supplier;)Ljdk/internal/module/ModuleInfo$Attributes;+16 java.base
j jdk.internal.module.ModulePath.readExplodedModule(Ljava/nio/file/Path;)Ljava/lang/module/ModuleReference;+35 java.base
j jdk.internal.module.ModulePath.readModule(Ljava/nio/file/Path;Ljava/nio/file/attribute/BasicFileAttributes;)Ljava/lang/module/ModuleReference;+11 java.base
j jdk.internal.module.ModulePath.scanDirectory(Ljava/nio/file/Path;)Ljava/util/Map;+69 java.base
j jdk.internal.module.ModulePath.scan(Ljava/nio/file/Path;)Ljava/util/Map;+60 java.base
j jdk.internal.module.ModulePath.scanNextEntry()V+23 java.base
j jdk.internal.module.ModulePath.find(Ljava/lang/String;)Ljava/util/Optional;+36 java.base
j jdk.internal.module.SystemModuleFinders$1.lambda$find$0(Ljava/lang/module/ModuleFinder;Ljava/lang/String;)Ljava/util/Optional;+2 java.base
j jdk.internal.module.SystemModuleFinders$1$$Lambda$1+0x0000000100038f38.run()Ljava/lang/Object;+8 java.base
j java.security.AccessController.executePrivileged(Ljava/security/PrivilegedAction;Ljava/security/AccessControlContext;Ljava/lang/Class;)Ljava/lang/Object;+29 java.base
j java.security.AccessController.doPrivileged(Ljava/security/PrivilegedAction;)Ljava/lang/Object;+5 java.base
j jdk.internal.module.SystemModuleFinders$1.find(Ljava/lang/String;)Ljava/util/Optional;+12 java.base
j jdk.internal.module.ModuleBootstrap.boot2()Ljava/lang/ModuleLayer;+292 java.base
j jdk.internal.module.ModuleBootstrap.boot()Ljava/lang/ModuleLayer;+64 java.base
j java.lang.System.initPhase2(ZZ)I+0 java.base
v ~StubRoutines::call_stub 0x000010000f41084c
V [libjvm.so+0xf47654] JavaCalls::call_helper(JavaValue*, methodHandle const&, JavaCallArguments*, JavaThread*)+0x694
V [libjvm.so+0x1606bbc] os::os_exception_wrapper(void (*)(JavaValue*, methodHandle const&, JavaCallArguments*, JavaThread*), JavaValue*, methodHandle const&, JavaCallArguments*, JavaThread*)+0x3c
V [libjvm.so+0xf48c04] JavaCalls::call_static(JavaValue*, Klass*, Symbol*, Symbol*, JavaCallArguments*, JavaThread*)+0x134
V [libjvm.so+0x1b03d80] Threads::create_vm(JavaVMInitArgs*, bool*)+0x730
V [libjvm.so+0x10f6e2c] JNI_CreateJavaVM+0xfc
C [libjli.so+0x78a4] JavaMain+0xc4
C [libjli.so+0xcce8] ThreadJavaMain+0x18
C [libpthread.so.0+0x8a64] start_thread+0xf4

Registers:
pc =0x0000100000f8532c lr =0x0000100000f850fc ctr=0x0000100000f71b60
r0 =0x0000100000f850fc r1 =0x0000100002a8ca50 r2 =0x00001000026c7b00
r3 =0x00001000020f9f28 r4 =0x0000000000000027 r5 =0x00001000020f9ef8
r6 =0x000010000211f918 r7 =0x0000000000000008 r8 =0x000010000276da40
r9 =0x0000100000070000 r10=0x0000000000000058 r11=0x0000100002a6ce20
r12=0x0000100000f71b60 r13=0x0000100002a968f0 r14=0x000010003414bbd1
r15=0x0000100002a8ce78 r16=0x00001000040279b0 r17=0x000000000000006e
r18=0x0000100002a8cf10 r19=0x00001000342151d8 r20=0x0000000000000000
r21=0x0000100002a8ce10 r22=0x0000000000000025 r23=0x000000000000007c
r24=0x000010000f433f38 r25=0x00001000027594a0 r26=0x0000100002a8cb28
r27=0x0000100002a8cb88 r28=0x0000100002a8cac8 r29=0x00001000027407d7
r30=0x0000000000000000 r31=0x0000100002a8ca50