The following test failed in the JDK15 CI:

jdk/jfr/api/consumer/streaming/TestJVMExit.java

Here's a snippet from the log file:

#section:main
----------messages:(7/397)----------
command: main jdk.jfr.api.consumer.streaming.TestJVMExit
reason: User specified action: run main/othervm jdk.jfr.api.consumer.streaming.TestJVMExit
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jfr,jdk.attach,java.base --add-exports java.base/jdk.internal.misc=ALL-UNNAMED
Timeout information:
--- Timeout information end.
elapsed time (seconds): 512.385
----------configuration:(4/112)----------
Boot Layer
  add modules: jdk.jfr jdk.attach java.base
  add exports: java.base/jdk.internal.misc ALL-UNNAMED

----------System.out:(3487/78651)----------
Command line: [/scratch/mesos/jib-master/install/jdk-15+14-494/macosx-x64-debug.jdk/jdk-15/fastdebug/bin/java -cp /scratch/mesos/slaves/90726e33-be99-4e27-9d68-25dad266ef13-S881/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/5f5ea42e-0295-44dc-8481-34c6265e6dc7/runs/2824b517-64b1-4ae9-b22f-5b2fa22420ce/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/0/jdk/jfr/api/consumer/streaming/TestJVMExit.d:/scratch/mesos/jib-master/install/jdk-15+14-494/src.full/open/test/jdk/jdk/jfr/api/consumer/streaming:/scratch/mesos/slaves/90726e33-be99-4e27-9d68-25dad266ef13-S881/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/5f5ea42e-0295-44dc-8481-34c6265e6dc7/runs/2824b517-64b1-4ae9-b22f-5b2fa22420ce/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/0/test/lib:/scratch/mesos/jib-master/install/jdk-15+14-494/src.full/open/test/lib:/scratch/mesos/slaves/90726e33-be99-4e27-9d68-25dad266ef13-S881/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/5f5ea42e-0295-44dc-8481-34c6265e6dc7/runs/2824b517-64b1-4ae9-b22f-5b2fa22420ce/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/0/test/jdk:/scratch/mesos/jib-master/install/jdk-15+14-494/src.full/open/test/jdk:/scratch/mesos/jib-master/install/jtreg/5.0/b01/bundles/jtreg_bin-5.0.zip/jtreg/lib/javatest.jar:/scratch/mesos/jib-master/install/jtreg/5.0/b01/bundles/jtreg_bin-5.0.zip/jtreg/lib/jtreg.jar --add-exports java.base/jdk.internal.misc=ALL-UNNAMED -XX:StartFlightRecording:settings=none jdk.jfr.api.consumer.streaming.TestProcess /scratch/mesos/slaves/90726e33-be99-4e27-9d68-25dad266ef13-S881/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/5f5ea42e-0295-44dc-8481-34c6265e6dc7/runs/2824b517-64b1-4ae9-b22f-5b2fa22420ce/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/scratch/2/action-1583429052398 ]
[exit-application]:/scratch/mesos/jib-master/install/jdk-15+14-494/macosx-x64-debug.jdk/jdk-15/fastdebug/bin/java -cp /scratch/mesos/slaves/90726e33-be99-4e27-9d68-25dad266ef13-S881/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/5f5ea42e-0295-44dc-8481-34c6265e6dc7/runs/2824b517-64b1-4ae9-b22f-5b2fa22420ce/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/0/jdk/jfr/api/consumer/streaming/TestJVMExit.d:/scratch/mesos/jib-master/install/jdk-15+14-494/src.full/open/test/jdk/jdk/jfr/api/consumer/streaming:/scratch/mesos/slaves/90726e33-be99-4e27-9d68-25dad266ef13-S881/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/5f5ea42e-0295-44dc-8481-34c6265e6dc7/runs/2824b517-64b1-4ae9-b22f-5b2fa22420ce/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/0/test/lib:/scratch/mesos/jib-master/install/jdk-15+14-494/src.full/open/test/lib:/scratch/mesos/slaves/90726e33-be99-4e27-9d68-25dad266ef13-S881/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/5f5ea42e-0295-44dc-8481-34c6265e6dc7/runs/2824b517-64b1-4ae9-b22f-5b2fa22420ce/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/classes/0/test/jdk:/scratch/mesos/jib-master/install/jdk-15+14-494/src.full/open/test/jdk:/scratch/mesos/jib-master/install/jtreg/5.0/b01/bundles/jtreg_bin-5.0.zip/jtreg/lib/javatest.jar:/scratch/mesos/jib-master/install/jtreg/5.0/b01/bundles/jtreg_bin-5.0.zip/jtreg/lib/jtreg.jar --add-exports java.base/jdk.internal.misc=ALL-UNNAMED -XX:StartFlightRecording:settings=none jdk.jfr.api.consumer.streaming.TestProcess /scratch/mesos/slaves/90726e33-be99-4e27-9d68-25dad266ef13-S881/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/5f5ea42e-0295-44dc-8481-34c6265e6dc7/runs/2824b517-64b1-4ae9-b22f-5b2fa22420ce/testoutput/test-support/jtreg_open_test_jdk_jdk_svc/scratch/2/action-1583429052398
Attach failed: No such process
Retrying...
Attach failed: No such process
Retrying...
Attach failed: No such process

<many pages of Attach failed messages>

This test machine is running 10.13.4 so I don't think this is
related to the recent OSX security policy changes.