The following test timed out in the JDK16 CI:

serviceability/sa/ClhsdbPmap.java#id1

Here's a snippet from the log file:

#section:main
----------messages:(6/225)----------
command: main ClhsdbPmap true
reason: User specified action: run main/othervm/timeout=480 ClhsdbPmap true
Mode: othervm [/othervm specified]
Timeout information:
--- Timeout information end.
elapsed time (seconds): 7091.584
----------configuration:(0/0)----------
----------System.out:(10/1923)----------
Starting ClhsdbPmap test: withCore==true
Command line: ['/mesos/work_dir/jib-master/install/jdk-16+17-803/macosx-x64-debug.jdk/jdk-16/fastdebug/bin/java' '-XX:MaxRAMPercentage=12' '-Djava.io.tmpdir=/mesos/work_dir/slaves/4076d11c-c6ed-4d07-84c1-4ab8d55cd975-S106665/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/7d436cda-b0f6-4c72-a44b-5ae78d818285/runs/92698b8b-a68e-42f9-ac26-67b087aa6f83/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_serviceability/tmp' '-XX:+CreateCoredumpOnCrash' '-XX:+UseZGC' '-XX:+CreateCoredumpOnCrash' '-Djava.library.path=/mesos/work_dir/jib-master/install/jdk-16+17-803/macosx-x64-debug.test/hotspot/jtreg/native' '-cp' '/mesos/work_dir/slaves/4076d11c-c6ed-4d07-84c1-4ab8d55cd975-S106665/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/7d436cda-b0f6-4c72-a44b-5ae78d818285/runs/92698b8b-a68e-42f9-ac26-67b087aa6f83/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_serviceability/classes/1/serviceability/sa/ClhsdbPmap_id1.d:/mesos/work_dir/slaves/4076d11c-c6ed-4d07-84c1-4ab8d55cd975-S106665/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/7d436cda-b0f6-4c72-a44b-5ae78d818285/runs/92698b8b-a68e-42f9-ac26-67b087aa6f83/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_serviceability/classes/1/test/lib' 'jdk.test.lib.apps.LingeredApp' '2caa4ce4-a63a-4f17-b0bc-8d59868343c5.lck' 'forceCrash']
[2020-09-24T07:46:40.119522Z] Gathering output for process 50602
[2020-09-24T07:46:40.192439Z] Waiting for completion for process 50602
[2020-09-24T07:46:40.192615Z] Waiting for completion finished for process 50602
Output and diagnostic info for process 50602 was saved into 'pid-50602-output.log'
[2020-09-24T07:46:40.201269Z] Waiting for completion for process 50602
[2020-09-24T07:46:40.201412Z] Waiting for completion finished for process 50602
Run test with ulimit -c: unlimited
Timeout refired 4800 times
----------System.err:(20/1273)----------
java.lang.RuntimeException: Test ERROR java.io.IOException: App waiting timeout
at ClhsdbPmap.main(ClhsdbPmap.java:88)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.io.IOException: App waiting timeout
at jdk.test.lib.apps.LingeredApp.waitAppReady(LingeredApp.java:265)
at jdk.test.lib.apps.LingeredApp.waitAppReady(LingeredApp.java:295)
at jdk.test.lib.apps.LingeredApp.startAppExactJvmOpts(LingeredApp.java:417)
at jdk.test.lib.apps.LingeredApp.startApp(LingeredApp.java:432)
at ClhsdbPmap.main(ClhsdbPmap.java:63)
... 6 more

JavaTest Message: Test threw exception: java.lang.RuntimeException: Test ERROR java.io.IOException: App waiting timeout
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Test ERROR java.io.IOException: App waiting timeout
----------rerun:(37/6805)*----------