The following test failed due to SIGSEGV:

vmTestbase/nsk/jvmti/ClassPrepare/classprep001/TestDescription.java

Here's a snippet from the log file:

#section:main
----------messages:(4/253)----------
command: main -agentlib:classprep001 nsk.jvmti.ClassPrepare.classprep001
reason: User specified action: run main/othervm/native -agentlib:classprep001 nsk.jvmti.ClassPrepare.classprep001
Mode: othervm [/othervm specified]
elapsed time (seconds): 1.187
----------configuration:(0/0)----------
----------System.out:(20/1350)----------
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f6ffe1cde20, pid=27842, tid=27856
#
# JRE version: Java(TM) SE Runtime Environment (14.0+9) (fastdebug build 14-ea+9-262)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 14-ea+9-262, compiled mode, sharing, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x925e20] ClassLoaderData::is_alive() const+0x0
#
# Core dump will be written. Default location: /opt/mach5/mesos/work_dir/slaves/00f4d7f9-7805-4b6a-aef8-9bb130db2435-S629/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/23a4bdd0-cce8-4975-b3c5-23e6f89385d6/runs/db3d3967-9016-4409-833e-9877ef80b4c3/testoutput/test-support/jtreg_open_test_hotspot_jtreg_vmTestbase_nsk_jvmti_quick/scratch/0/core.27842
#
# An error report file with more information is saved as:
# /opt/mach5/mesos/work_dir/slaves/00f4d7f9-7805-4b6a-aef8-9bb130db2435-S629/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/23a4bdd0-cce8-4975-b3c5-23e6f89385d6/runs/db3d3967-9016-4409-833e-9877ef80b4c3/testoutput/test-support/jtreg_open_test_hotspot_jtreg_vmTestbase_nsk_jvmti_quick/scratch/0/hs_err_pid27842.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
Current thread is 27856
Dumping core ...
----------System.err:(0/0)----------