JDK-8202662 : JFR tests fails: Could not find leak with class
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 11
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2018-05-04
  • Updated: 2018-09-20
  • Resolved: 2018-05-09
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JDK 11
11 b13Fixed
Related Reports
Relates :  
JDK-8202835 - jfr/event/os/TestSystemProcess.java fails on missing events
Relates :  
JDK-8205651 - TestLargeRootSet fails with exception: Could not find root object
Relates :  
JDK-8205722 - 6.6% regression in SPECjvm2008-MonteCarlo with G1 on Linux in JDK 11
Relates :  
JDK-8210977 - jdk/jfr/event/oldobject/TestThreadLocalLeak.java fails to find ThreadLocalObject
Relates :  
JDK-8191471 - Elastic TLABs for G1
Description
Several tests failed in the nightly on all platforms:

com/oracle/jfr/event/oldobject/TestSerial.java
com/oracle/jfr/event/oldobject/TestParallel.java
com/oracle/jfr/event/oldobject/TestParallelOld.java
com/oracle/jfr/event/oldobject/TestCMS.java
com/oracle/jfr/event/oldobject/TestG1.java
com/oracle/jfr/event/oldobject/TestThreadLocalLeak.java
com/oracle/jfr/event/oldobject/TestListenerLeak.java
com/oracle/jfr/event/os/TestSystemProcess.java

Three different asserts is seen:

java.lang.Exception: Could not find leak with class [Lcom.oracle.jfr.event.oldobject.TestParallelOld$FindMe;
	at com.oracle.jfr.event.oldobject.TestParallelOld.main(TestParallelOld.java:43)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
	at java.base/java.lang.Thread.run(Thread.java:832)


java.lang.RuntimeException: No events: expected false, was true
	at jdk.testlibrary.Asserts.fail(Asserts.java:540)
	at jdk.testlibrary.Asserts.assertFalse(Asserts.java:465)
	at com.oracle.jfr.common.Events.hasEvents(Events.java:134)
	at com.oracle.jfr.event.os.TestSystemProcess.main(TestSystemProcess.java:32)
	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:569)
	at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
	at java.base/java.lang.Thread.run(Thread.java:832)


java.lang.RuntimeException: Could not find root object
	at jdk.testlibrary.Asserts.fail(Asserts.java:540)
	at com.oracle.jfr.event.oldobject.TestLargeRootSet.main(TestLargeRootSet.java:105)
	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:569)
	at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
	at java.base/java.lang.Thread.run(Thread.java:832)
Comments
After the fix I realized that com/oracle/jfr/event/os/TestSystemProcess.java still fails. It was not caused by the above change and I will open a new bug on this test. I verified this by syncing to: changeset: 49945:9425445633cf user: sjohanss date: Wed May 02 13:44:46 2018 +0200 summary: 8191471: Elastic TLABs for G1 Running the test on this change passed.
09-05-2018
Found the bug, after the above change we do not handle small TLABs very well because the BYTES vs WORDS calculation comparing the MinTLABSize was added. But all values in the TLAB size calculation uses words, while MinTLABSize is in bytes. The fix is simple will send it out for review soon and hopefully push tomorrow.
07-05-2018
This is not test related. The dumped recording lacks the FindMe[] object sanple.
07-05-2018
Bisection points to the following changeset: changeset: 49945:9425445633cf user: sjohanss date: Wed May 02 13:44:46 2018 +0200 summary: 8191471: Elastic TLABs for G1
07-05-2018