The following test failed in the JDK16 CI:

com/sun/jdi/CatchAllTest.java

Here's a snippet from the log file:

#section:main
----------messages:(5/212)----------
command: main CatchAllTest
reason: User specified action: run main/othervm CatchAllTest
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jdi
elapsed time (seconds): 136.002
----------configuration:(3/35)----------
Boot Layer
  add modules: jdk.jdi

----------System.out:(82/7810)----------
Command line: [/mesos/work_dir/jib-master/install/jdk-16+26-1678/macosx-x64-debug.jdk/jdk-16/fastdebug/bin/java -cp /mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S22391/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/3eb5bc66-6128-4839-8e64-6602dc12fa07/runs/dfd75ffa-0421-484f-9429-4cf66b65ae10/testoutput/test-support/jtreg_open_test_jdk_jdk_jdi/classes/0/com/sun/jdi/CatchAllTest.d:/mesos/work_dir/jib-master/install/jdk-16+26-1678/src.full/open/test/jdk/com/sun/jdi:/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S22391/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/3eb5bc66-6128-4839-8e64-6602dc12fa07/runs/dfd75ffa-0421-484f-9429-4cf66b65ae10/testoutput/test-support/jtreg_open_test_jdk_jdk_jdi/classes/0/test/lib:/mesos/work_dir/jib-master/install/jdk-16+26-1678/src.full/open/test/lib:/mesos/work_dir/jib-master/install/jtreg/5.1/b01/bundles/jtreg_bin-5.1.zip/jtreg/lib/javatest.jar:/mesos/work_dir/jib-master/install/jtreg/5.1/b01/bundles/jtreg_bin-5.1.zip/jtreg/lib/jtreg.jar -Xmx512m -XX:MaxRAMPercentage=12 -Djava.io.tmpdir=/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S22391/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/3eb5bc66-6128-4839-8e64-6602dc12fa07/runs/dfd75ffa-0421-484f-9429-4cf66b65ae10/testoutput/test-support/jtreg_open_test_jdk_jdk_jdi/tmp -ea -esa -server -agentlib:jdwp=transport=dt_socket,server=y,suspend=y CatchAllTestTarg ]
[debuggee]:/mesos/work_dir/jib-master/install/jdk-16+26-1678/macosx-x64-debug.jdk/jdk-16/fastdebug/bin/java -cp /mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S22391/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/3eb5bc66-6128-4839-8e64-6602dc12fa07/runs/dfd75ffa-0421-484f-9429-4cf66b65ae10/testoutput/test-support/jtreg_open_test_jdk_jdk_jdi/classes/0/com/sun/jdi/CatchAllTest.d:/mesos/work_dir/jib-master/install/jdk-16+26-1678/src.full/open/test/jdk/com/sun/jdi:/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S22391/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/3eb5bc66-6128-4839-8e64-6602dc12fa07/runs/dfd75ffa-0421-484f-9429-4cf66b65ae10/testoutput/test-support/jtreg_open_test_jdk_jdk_jdi/classes/0/test/lib:/mesos/work_dir/jib-master/install/jdk-16+26-1678/src.full/open/test/lib:/mesos/work_dir/jib-master/install/jtreg/5.1/b01/bundles/jtreg_bin-5.1.zip/jtreg/lib/javatest.jar:/mesos/work_dir/jib-master/install/jtreg/5.1/b01/bundles/jtreg_bin-5.1.zip/jtreg/lib/jtreg.jar -Xmx512m -XX:MaxRAMPercentage=12 -Djava.io.tmpdir=/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S22391/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/3eb5bc66-6128-4839-8e64-6602dc12fa07/runs/dfd75ffa-0421-484f-9429-4cf66b65ae10/testoutput/test-support/jtreg_open_test_jdk_jdk_jdi/tmp -ea -esa -server -agentlib:jdwp=transport=dt_socket,server=y,suspend=y CatchAllTestTarg
Thread[Finalizer,8,system] stack: (length = 4)
java.base@16-ea/java.lang.Object.wait(Native Method)
java.base@16-ea/java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:155)
java.base@16-ea/java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:176)
java.base@16-ea/java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:171)

Thread[main,5,main] stack: (length = 4)
java.base@16-ea/java.lang.Object.wait(Native Method)
java.base@16-ea/java.lang.Thread.join(Thread.java:1301)
java.base@16-ea/java.lang.Thread.join(Thread.java:1369)
app//com.sun.javatest.regtest.agent.MainWrapper.main(MainWrapper.java:74)

Thread[Thread-2,5,MainThreadGroup] stack: (length = 12)
java.base@16-ea/java.io.FileInputStream.readBytes(Native Method)
java.base@16-ea/java.io.FileInputStream.read(FileInputStream.java:271)
java.base@16-ea/java.io.BufferedInputStream.read1(BufferedInputStream.java:282)
java.base@16-ea/java.io.BufferedInputStream.read(BufferedInputStream.java:343)
java.base@16-ea/java.io.BufferedInputStream.fill(BufferedInputStream.java:244)
java.base@16-ea/java.io.BufferedInputStream.read1(BufferedInputStream.java:284)
java.base@16-ea/java.io.BufferedInputStream.read(BufferedInputStream.java:343)
java.base@16-ea/java.io.FilterInputStream.read(FilterInputStream.java:106)
app//jdk.test.lib.process.StreamPumper.run(StreamPumper.java:109)
java.base@16-ea/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
java.base@16-ea/java.util.concurrent.FutureTask.run(FutureTask.java:264)
java.base@16-ea/java.lang.Thread.run(Thread.java:831)

Thread[Signal Dispatcher,9,system] stack: (length = 0)

Thread[MainThread,5,MainThreadGroup] stack: (length = 15)
java.base@16-ea/java.lang.Thread.dumpThreads(Native Method)
java.base@16-ea/java.lang.Thread.getAllStackTraces(Thread.java:1647)
app//jdk.test.lib.process.ProcessTools.startProcess(ProcessTools.java:223)
app//lib.jdb.Debuggee.<init>(Debuggee.java:131)
app//lib.jdb.Debuggee$Launcher.launch(Debuggee.java:118)
app//lib.jdb.Debuggee$Launcher.launch(Debuggee.java:121)
app//lib.jdb.JdbTest.setup(JdbTest.java:117)
app//lib.jdb.JdbTest.run(JdbTest.java:94)
app//CatchAllTest.main(CatchAllTest.java:52)
java.base@16-ea/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
java.base@16-ea/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
java.base@16-ea/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.base@16-ea/java.lang.reflect.Method.invoke(Method.java:564)
app//com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
java.base@16-ea/java.lang.Thread.run(Thread.java:831)

Thread[Reference Handler,10,system] stack: (length = 3)
java.base@16-ea/java.lang.ref.Reference.waitForReferencePendingList(Native Method)
java.base@16-ea/java.lang.ref.Reference.processPendingReferences(Reference.java:241)
java.base@16-ea/java.lang.ref.Reference$ReferenceHandler.run(Reference.java:213)

Thread[Thread-1,5,MainThreadGroup] stack: (length = 12)
java.base@16-ea/java.io.FileInputStream.readBytes(Native Method)
java.base@16-ea/java.io.FileInputStream.read(FileInputStream.java:271)
java.base@16-ea/java.io.BufferedInputStream.read1(BufferedInputStream.java:282)
java.base@16-ea/java.io.BufferedInputStream.read(BufferedInputStream.java:343)
java.base@16-ea/java.io.BufferedInputStream.fill(BufferedInputStream.java:244)
java.base@16-ea/java.io.BufferedInputStream.read1(BufferedInputStream.java:284)
java.base@16-ea/java.io.BufferedInputStream.read(BufferedInputStream.java:343)
java.base@16-ea/java.io.FilterInputStream.read(FilterInputStream.java:106)
app//jdk.test.lib.process.StreamPumper.run(StreamPumper.java:109)
java.base@16-ea/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
java.base@16-ea/java.util.concurrent.FutureTask.run(FutureTask.java:264)
java.base@16-ea/java.lang.Thread.run(Thread.java:831)

Thread[Common-Cleaner,8,InnocuousThreadGroup] stack: (length = 5)
java.base@16-ea/java.lang.Object.wait(Native Method)
java.base@16-ea/java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:155)
java.base@16-ea/jdk.internal.ref.CleanerImpl.run(CleanerImpl.java:140)
java.base@16-ea/java.lang.Thread.run(Thread.java:831)
java.base@16-ea/jdk.internal.misc.InnocuousThread.run(InnocuousThread.java:134)

Thread[process reaper,10,system] stack: (length = 5)
java.base@16-ea/java.lang.ProcessHandleImpl.waitForProcessExit0(Native Method)
java.base@16-ea/java.lang.ProcessHandleImpl$1.run(ProcessHandleImpl.java:146)
java.base@16-ea/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
java.base@16-ea/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
java.base@16-ea/java.lang.Thread.run(Thread.java:831)

Thread[Notification Thread,9,system] stack: (length = 0)

----------System.err:(15/1039)----------
Failed to start a process (thread dump follows)
java.lang.NullPointerException: Cannot invoke "lib.jdb.Jdb.log(String)" because "this.jdb" is null
at lib.jdb.JdbTest.run(JdbTest.java:97)
at CatchAllTest.main(CatchAllTest.java:52)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
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:831)

JavaTest Message: Test threw exception: java.lang.NullPointerException: Cannot invoke "lib.jdb.Jdb.log(String)" because "this.jdb" is null
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.NullPointerException: Cannot invoke "lib.jdb.Jdb.log(String)" because "this.jdb" is null
----------rerun:(39/6367)*----------