Test: runtime/Metaspace/FragmentMetaspace.java#8320331

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S11866/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/95a38af4-8097-4181-b824-0f0935f3e87e/runs/41124d19-2336-4a42-a2e2-a51211488c94/workspace/open/src/hotspot/share/gc/z/zVerify.cpp:133), pid=1359982, tid=1360009
# assert(o != zpointer::null) failed: Old should not contain raw null
#
# JRE version: Java(TM) SE Runtime Environment (26.0+26) (fastdebug build 26-ea+26-2556)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 26-ea+26-2556, mixed mode, sharing, tiered, compressed class ptrs, z gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x1deefe5] z_verify_old_oop(zpointer*)+0x225
#
# Core dump will be written. Default location: Core dumps may be processed with "/opt/core.sh %p" (or dumping to /opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/scratch/5/core.1359982)
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#

--------------- S U M M A R Y ------------

Command Line: -Dtest.vm.opts=-XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/25/37/bundles/linux-x64/jdk-25_linux-x64_bin.tar.gz/jdk-25 -Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/tmp -Dtest.tool.vm.opts=-J-XX:MaxRAMPercentage=4.16667 -J-Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/25/37/bundles/linux-x64/jdk-25_linux-x64_bin.tar.gz/jdk-25 -J-Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/tmp -Dtest.compiler.opts= -Dtest.java.opts=-XX:+UseZGC -Dtest.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/linux-x64-debug.jdk/jdk-26/fastdebug -Dcompile.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/linux-x64-debug.jdk/jdk-26/fastdebug -Dtest.timeout.factor=4.0 -Dtest.nativepath=/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/linux-x64-debug.test/hotspot/jtreg/native -Dtest.root=/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/src.full/open/test/hotspot/jtreg -Dtest.name=runtime/Metaspace/FragmentMetaspace.java#8320331 -Dtest.verbose=Verbose[p=BRIEF,f=FULL,e=FULL,t=true,m=false] -Dtest.file=/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/src.full/open/test/hotspot/jtreg/runtime/Metaspace/FragmentMetaspace.java -Dtest.main.class=FragmentMetaspace -Dtest.src=/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/src.full/open/test/hotspot/jtreg/runtime/Metaspace -Dtest.src.path=/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/src.full/open/test/hotspot/jtreg/runtime/Metaspace:/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/src.full/open/test/lib -Dtest.classes=/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/classes/5/runtime/Metaspace/FragmentMetaspace_8320331.d -Dtest.class.path=/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/classes/5/runtime/Metaspace/FragmentMetaspace_8320331.d:/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/classes/5/runtime/Metaspace/FragmentMetaspace_8320331.d/test/lib -Dtest.class.path.prefix=/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/classes/5/runtime/Metaspace/FragmentMetaspace_8320331.d:/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/src.full/open/test/hotspot/jtreg/runtime/Metaspace:/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/classes/5/runtime/Metaspace/FragmentMetaspace_8320331.d/test/lib -Dtest.modules=java.base/jdk.internal.misc java.compiler --add-modules=java.base,java.compiler --add-exports=java.base/jdk.internal.misc=ALL-UNNAMED -XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/25/37/bundles/linux-x64/jdk-25_linux-x64_bin.tar.gz/jdk-25 -Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/tmp -XX:+UseZGC -Djava.library.path=/opt/mach5/mesos/work_dir/jib-master/install/jdk-26+26-2556/linux-x64-debug.test/hotspot/jtreg/native -XX:+UnlockDiagnosticVMOptions -XX:+VerifyDuringGC -Xmx1g com.sun.javatest.regtest.agent.MainWrapper /opt/mach5/mesos/work_dir/slaves/da1065b5-7b94-4f0d-85e9-a3a252b9a32e-S12176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/163f4a39-88aa-4297-927a-fc73c4a7d363/runs/136cdb29-8ae0-4861-b0e7-e08f124a4201/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_runtime/runtime/Metaspace/FragmentMetaspace_8320331.d/main.0.jta

Host: AMD EPYC 9J14 96-Core Processor, 12 cores, 23G, Oracle Linux Server release 8.10
Time: Fri Nov 21 12:40:29 2025 UTC elapsed time: 33.071616 seconds (0d 0h 0m 33s)

--------------- T H R E A D ---------------

Current thread (0x00007f780c1949b0): VMThread "VM Thread" [id=1360009, stack(0x00007f77df0f2000,0x00007f77df1f2000) (1024K)] _threads_hazard_ptr=0x00007f77710cd690, _nested_threads_hazard_ptr_cnt=0

Stack: [0x00007f77df0f2000,0x00007f77df1f2000], sp=0x00007f77df1efa20, free space=1014k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x1deefe5] z_verify_old_oop(zpointer*)+0x225 (zVerify.cpp:133)
V [libjvm.so+0x1dfce86] void InstanceRefKlass::oop_oop_iterate<oop, ZVerifyOldOopClosure>(oop, ZVerifyOldOopClosure*)+0x126 (zVerify.cpp:271)
V [libjvm.so+0x1dfd3e2] void OopOopIterateDispatch<ZVerifyOldOopClosure>::Table::oop_oop_iterate<InstanceRefKlass, oop>(ZVerifyOldOopClosure*, oop, Klass*)+0x52 (iterator.inline.hpp:109)
V [libjvm.so+0x1df7f6a] void ZIterator::oop_iterate_safe<ZVerifyOldOopClosure>(oop, ZVerifyOldOopClosure*)+0xfa (iterator.inline.hpp:294)
V [libjvm.so+0x1df8204] ZVerifyObjectClosure::do_object(oop)+0x174 (zVerify.cpp:426)
V [libjvm.so+0x1d5aef8] ZHeapIterator::mark_visit_and_push(ZHeapIteratorContext const&, oop) [clone .part.0]+0x2d8 (zHeapIterator.cpp:86)
V [libjvm.so+0x1d5f4ed] ZHeapIteratorOopClosure<false>::do_oop(oop*)+0xcd (zHeapIterator.cpp:228)
V [libjvm.so+0x1d62477] void OopOopIterateDispatch<ZHeapIteratorOopClosure<false> >::Table::oop_oop_iterate<InstanceMirrorKlass, oop>(ZHeapIteratorOopClosure<false>*, oop, Klass*)+0x4b7 (devirtualizer.inline.hpp:87)
V [libjvm.so+0x1d6373d] void ZIterator::oop_iterate<ZHeapIteratorOopClosure<false> >(oop, ZHeapIteratorOopClosure<false>*)+0x9d (iterator.inline.hpp:294)
V [libjvm.so+0x1d63a72] void ZHeapIterator::visit_and_follow<false>(ZHeapIteratorContext const&, oop)+0x182 (zHeapIterator.cpp:433)
V [libjvm.so+0x1d63cca] void ZHeapIterator::drain<false>(ZHeapIteratorContext const&)+0x11a (zHeapIterator.cpp:488)
V [libjvm.so+0x1d5bd6b] ZHeapIterator::object_and_field_iterate(ObjectClosure*, OopFieldClosure*, unsigned int)+0x17b (zHeapIterator.cpp:520)
V [libjvm.so+0x1d572ce] ZHeap::object_and_field_iterate_for_verify(ObjectClosure*, OopFieldClosure*, bool)+0x29e (zHeap.cpp:337)
V [libjvm.so+0x1dedfb9] ZVerify::objects(bool) [clone .part.0]+0x119 (zVerify.cpp:483)
V [libjvm.so+0x1defbf1] ZVerify::after_mark()+0x31 (zVerify.cpp:465)
V [libjvm.so+0x1d4dfe8] ZGenerationOld::mark_end()+0x68 (zGeneration.cpp:1273)
V [libjvm.so+0x1d526f9] VM_ZMarkEndOld::do_operation()+0x99 (zGeneration.cpp:1106)
V [libjvm.so+0x1d510d0] VM_ZOperation::doit()+0x40 (zGeneration.cpp:451)
V [libjvm.so+0x1c9d806] VM_Operation::evaluate()+0x196 (vmOperations.cpp:74)
V [libjvm.so+0x1cb985b] VMThread::evaluate_operation(VM_Operation*)+0x5eb (vmThread.cpp:284)
V [libjvm.so+0x1cba2ff] VMThread::inner_execute(VM_Operation*)+0x42f (vmThread.cpp:421)
V [libjvm.so+0x1cba494] VMThread::loop()+0x84 (vmThread.cpp:487)
V [libjvm.so+0x1cba5a4] VMThread::run()+0x94 (vmThread.cpp:177)
V [libjvm.so+0x1b9b4f6] Thread::call_run()+0xb6 (thread.cpp:242)
V [libjvm.so+0x17f72c8] thread_native_entry(Thread*)+0x118 (os_linux.cpp:862)