The following three tests failed in the JDK18 CI with UT enabled:

gtest/LargePageGtests.java#use-large-pages
gtest/LargePageGtests.java#use-large-pages-sysV
gtest/LargePageGtests.java#use-large-pages-1G

Here's a log file snippet from LargePageGtests.java#use-large-pages:

[----------] Global test environment tear-down
[==========] 35 tests from 3 test cases ran. (1182 ms total)
[  PASSED  ] 35 tests.
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f3a63f54720, pid=29433, tid=29511
#
# JRE version: Java(TM) SE Runtime Environment ((uninitialized)) (build 18-ea+6-203)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (18-ea+6-203, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0x6f0720]  AccessInternal::PostRuntimeDispatch<G1BarrierSet::AccessBarrier<1335398ul, G1BarrierSet>, (AccessInternal::BarrierType)3, 1335398ul>::oop_access_barrier(oopDesc*, long)+0x0
#
# 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/28992c6d-c35d-42fa-8099-898223bf183b-S25569/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/4bbe97e3-8e8a-4b73-95b7-38299a35deda/runs/d75f3535-3654-460d-881d-6ee6bf4257c5/testoutput/test-support/jtreg_open_test_hotspot_jtreg_tier1_common/scratch/3/core.29433)
#
# An error report file with more information is saved as:
# /opt/mach5/mesos/work_dir/slaves/28992c6d-c35d-42fa-8099-898223bf183b-S25569/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/4bbe97e3-8e8a-4b73-95b7-38299a35deda/runs/d75f3535-3654-460d-881d-6ee6bf4257c5/testoutput/test-support/jtreg_open_test_hotspot_jtreg_tier1_common/scratch/3/hs_err_pid29433.log
#
# If you would like to submit a bug report, please visit:
#   https://bugreport.java.com/bugreport/crash.jsp
#

[2021-07-10T18:35:27.430574380Z] Waiting for completion for process 29433
[2021-07-10T18:35:27.437665972Z] Waiting for completion finished for process 29433
----------System.err:(12/722)----------
java.lang.AssertionError: gtest execution failed; exit code = 134.
	at GTestWrapper.main(GTestWrapper.java:98)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:312)
	at java.base/java.lang.Thread.run(Thread.java:833)


The other two subtests have similar snippets in their log files.


Here's the crashing thread from LargePageGtests.java#use-large-pages:

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

Current thread (0x0000557020ae7c00):  JavaThread "UsageTracker" daemon [_thread_in_vm, id=29511, stack(0x00007f3a28cf5000,0x00007f3a28df6000)]

Stack: [0x00007f3a28cf5000,0x00007f3a28df6000],  sp=0x00007f3a28def058,  free space=1000k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x6f0720]  AccessInternal::PostRuntimeDispatch<G1BarrierSet::AccessBarrier<1335398ul, G1BarrierSet>, (AccessInternal::BarrierType)3, 1335398ul>::oop_access_barrier(oopDesc*, long)+0x0
V  [libjvm.so+0xad964b]  java_lang_Throwable::fill_in_stack_trace(Handle, methodHandle const&)+0x2b
V  [libjvm.so+0xb8dfcb]  JVM_FillInStackTrace+0xeb
C  [libjava.so+0x12f82]  Java_java_lang_Throwable_fillInStackTrace+0x12
C  0x00007f3a4c0e153a

[error occurred during error reporting (printing native stack), id 0xb, SIGSEGV (0xb) at pc=0x00007f3a641c729b]

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
C  0x00007f3a4c0e150b

[error occurred during error reporting (printing Java stack), id 0xb, SIGSEGV (0xb) at pc=0x00007f3a641c729b]


siginfo: si_signo: 11 (SIGSEGV), si_code: 1 (SEGV_MAPERR), si_addr: 0x0000000000000010


The other two subtests have similar crashing thread snippets.