[CASSANDRA-17884] [jamm] Test failure: o.a.c.repair.RepairJobTest.testNoTreesRetainedAfterDifference

• Type: Bug
• Status: Open
• Priority: Normal
• Resolution: Unresolved
• Fix Version/s: 4.0.x, 4.1.x
• Component/s: Jamm, Test/unit
• Bug Category: Correctness - Test Failure
• Severity: Normal
• Complexity: Normal
• Discovered By: User Report
• Platform: All
• Assignee: Unassigned
• Reporter: Andres de la Peña
• Created: 12/Sep/22 12:27
• Updated: 30/Aug/23 15:11

Description

The unit test org.apache.cassandra.repair.RepairJobTest#testNoTreesRetainedAfterDifference seems to be slightly flaky at least in 4.0. We haven't seen it failing on Butler, but after a failure on a patch branch, this repeated run shows a 0.28% flakiness:

• https://app.circleci.com/pipelines/github/adelapena/cassandra/2076/workflows/8adbfe99-afb5-43af-84ad-43df2a2a86e2/jobs/20816/tests
• https://app.circleci.com/pipelines/github/adelapena/cassandra/2076/workflows/e550d8c2-7c35-4326-bd95-6909978d344b/jobs/20817/tests

java.lang.reflect.InaccessibleObjectException: Unable to make field private jdk.internal.platform.cgroupv1.SubSystem$MemorySubSystem jdk.internal.platform.cgroupv1.Metrics.memory accessible: module java.base does not "opens jdk.internal.platform.cgroupv1" to unnamed module @157853da
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280)
	at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:176)
	at java.base/java.lang.reflect.Field.setAccessible(Field.java:170)
	at org.github.jamm.MemoryMeter.addFieldChildren(MemoryMeter.java:330)
	at org.github.jamm.MemoryMeter.measureDeep(MemoryMeter.java:269)
	at org.apache.cassandra.utils.ObjectSizes.measureDeep(ObjectSizes.java:216)
	at org.apache.cassandra.repair.RepairJobTest.testNoTreesRetainedAfterDifference(RepairJobTest.java:271)
	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)

Flakiness is really low but the failure is clearly reproducible in j11.

Issue Links

• Discovered while testing: CASSANDRA-17819 Test failure: org.apache.cassandra.distributed.test.SchemaTest.schemaReset
• is related to: CASSANDRA-16895 Build with Java 17
• is related to: CASSANDRA-18329 Upgrade jamm; fix eclipse problems