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https://issues.apache.org/jira/browse/FLINK-31244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17694002#comment-17694002
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Matthias Pohl commented on FLINK-31244:
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[~xtsong] what's the intention of throwing the {{IllegalStateException}} in the
first place here? AFAIU, checking the cleanup method is the actual reason for
this test.
> OffHeapUnsafeMemorySegmentTest.testCallCleanerOnceOnConcurrentFree prints
> IllegalStateException
> -----------------------------------------------------------------------------------------------
>
> Key: FLINK-31244
> URL: https://issues.apache.org/jira/browse/FLINK-31244
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Network, Tests
> Affects Versions: 1.17.0, 1.15.3, 1.16.1
> Reporter: Matthias Pohl
> Priority: Major
> Labels: starter, test-stability
>
> We're observing strange IllegalStateException stacktrace output in
> {{OffHeapUnsafeMemorySegmentTest.testCallCleanerOnceOnConcurrentFree}} in CI
> like:
> [https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=46283&view=logs&j=4d4a0d10-fca2-5507-8eed-c07f0bdf4887&t=7b25afdf-cc6c-566f-5459-359dc2585798&l=5584]
>
> {code:java}
> Feb 18 03:58:47 [INFO] Running
> org.apache.flink.core.memory.OffHeapUnsafeMemorySegmentTest
> Exception in thread "Thread-13" java.lang.IllegalStateException:
> MemorySegment can be freed only once!
> at org.apache.flink.core.memory.MemorySegment.free(MemorySegment.java:244)
> at java.lang.Thread.run(Thread.java:748)
> Exception in thread "Thread-15" java.lang.IllegalStateException:
> MemorySegment can be freed only once!
> at org.apache.flink.core.memory.MemorySegment.free(MemorySegment.java:244)
> at java.lang.Thread.run(Thread.java:748)
> Exception in thread "Thread-17" java.lang.IllegalStateException:
> MemorySegment can be freed only once!
> at org.apache.flink.core.memory.MemorySegment.free(MemorySegment.java:244)
> at java.lang.Thread.run(Thread.java:748){code}
> This is caused by FLINK-21798. The corresponding system property is enabled
> as part of the CI run (see
> [tools/ci/test_controller.sh:108|https://github.com/apache/flink/blob/7e37d59f834bca805f5fbee99db87eb909d1814f/tools/ci/test_controller.sh#L108])
> which makes the {{IllegalStateException}} to be thrown.
> AFAIU, the intention of this test was to make sure that the cleaner logic is
> only called once even if the free method is called multiple times.
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