Mach5 test failed:
open/test/hotspot/jtreg/runtime/modules/ModuleStress/ExportModuleStressTest.java

Snippet of test log:
----------System.err:(40/2495)----------
 stdout: [# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/klass.inline.hpp:66
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/scratch/opt/mach5/mesos/work_dir/slaves/c4ee7e63-1ded-4e8c-9581-ce26f27e3af4-S419/frameworks/14a03e04-9f3c-408e-8ddf-efd6aa9b759f-0005/executors/b85751ab-316e-4701-a0cd-9a949d51b4e8/runs/c13686f3-8a4b-415a-a724-6c31be32365b/workspace/open/src/hotspot/share/oops/klass.inline.hpp:66), pid=7666, tid=7769
# assert(check_klass_alignment(result)) failed: address not aligned: 0x00000008baadbabe
#
# JRE version: Java(TM) SE Runtime Environment (12.0) (fastdebug build 12-internal+0-jdk12-jdk.345)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 12-internal+0-jdk12-jdk.345, mixed mode, tiered, compressed oops, g1 gc, linux-amd64)
# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /scratch/opt/mach5/mesos/work_dir/slaves/c4ee7e63-1ded-4e8c-9581-ce26f27e3af4-S283473/frameworks/14a03e04-9f3c-408e-8ddf-efd6aa9b759f-0005/executors/b7220a9c-ee76-4b92-872c-3ccbf4c46b1c/runs/011cbdc7-290b-4fca-a931-7ae483696182/testoutput/jtreg/JTwork/scratch/0/hs_err_pid7666.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
Current thread is 7769
Dumping core ...
];
 stderr: []
 exitValue = 134

java.lang.RuntimeException: 'failed: 0' missing from stdout/stderr

at jdk.test.lib.process.OutputAnalyzer.shouldContain(OutputAnalyzer.java:150)
at ExportModuleStressTest.main(ExportModuleStressTest.java:77)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:834)

JavaTest Message: Test threw exception: java.lang.RuntimeException: 'failed: 0' missing from stdout/stderr

JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: 'failed: 0' missing from stdout/stderr