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Brandon Williams commented on CASSANDRA-15313: ---------------------------------------------- This is mostly due to the two places where a rather large example size is used, 500. I did many runs lowering this number until I could be sure there were no timeouts, and that number is 35. However, once the test was not always timing out (at around 40 examples) it discovered a seed that always fails: {code:java} [junit-timeout] Seed was 552252992721215 [junit-timeout] at org.quicktheories.core.ExceptionReporter.falsify(ExceptionReporter.java:43) [junit-timeout] at org.quicktheories.core.ExceptionReporter.falisification(ExceptionReporter.java:37) [junit-timeout] at org.quicktheories.impl.TheoryRunner.reportFalsification(TheoryRunner.java:48) [junit-timeout] at org.quicktheories.impl.TheoryRunner.check(TheoryRunner.java:37) [junit-timeout] at org.quicktheories.dsl.TheoryBuilder4.check(TheoryBuilder4.java:150) [junit-timeout] at org.quicktheories.dsl.TheoryBuilder4.checkAssert(TheoryBuilder4.java:162) [junit-timeout] at org.apache.cassandra.transport.frame.checksum.ChecksummingTransformerTest.corruptionCausesFailure(ChecksummingTransformerTest.java:88) [junit-timeout] [junit-timeout] [junit-timeout] Test org.apache.cassandra.transport.frame.checksum.ChecksummingTransformerTest FAILED {code} Sometimes instead of failing the test, it will crash the jvm here: {code:java} [junit-timeout] # C [liblz4-java4100719362944375598.so+0x5eb7] LZ4_decompress_fast+0x117 {code} I've reproduced this against lz4 1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.6.0, 1.7.0, and 1.7.1. I think beyond the flakiness which can be solved by reducing the amount of examples, we've got a legitimate bug in lz4. I pushed the branch to reproduce here: https://github.com/driftx/cassandra/tree/CASSANDRA-15313 WDYT, [~samt]? > Fix flaky - ChecksummingTransformerTest - > org.apache.cassandra.transport.frame.checksum.ChecksummingTransformerTest > ------------------------------------------------------------------------------------------------------------------- > > Key: CASSANDRA-15313 > URL: https://issues.apache.org/jira/browse/CASSANDRA-15313 > Project: Cassandra > Issue Type: Bug > Components: Test/dtest > Reporter: Vinay Chella > Assignee: Brandon Williams > Priority: Normal > Fix For: 4.0-alpha > > > During the recent runs, this test appears to be flaky. > Example failure: > [https://circleci.com/gh/vinaykumarchella/cassandra/459#tests/containers/94] > corruptionCausesFailure-compression - > org.apache.cassandra.transport.frame.checksum.ChecksummingTransformerTest > {code:java} > java.lang.OutOfMemoryError: GC overhead limit exceeded > at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:57) > at java.nio.ByteBuffer.allocate(ByteBuffer.java:335) > at org.quicktheories.impl.Precursor.<init>(Precursor.java:17) > at > org.quicktheories.impl.ConcreteDetachedSource.<init>(ConcreteDetachedSource.java:8) > at > org.quicktheories.impl.ConcreteDetachedSource.detach(ConcreteDetachedSource.java:23) > at org.quicktheories.generators.Retry.generate(CodePoints.java:51) > at > org.quicktheories.generators.Generate.lambda$intArrays$10(Generate.java:190) > at > org.quicktheories.generators.Generate$$Lambda$17/1847008471.generate(Unknown > Source) > at org.quicktheories.core.DescribingGenerator.generate(Gen.java:255) > at org.quicktheories.core.Gen.lambda$map$0(Gen.java:36) > at org.quicktheories.core.Gen$$Lambda$20/71399214.generate(Unknown > Source) > at org.quicktheories.core.Gen.lambda$map$0(Gen.java:36) > at org.quicktheories.core.Gen$$Lambda$20/71399214.generate(Unknown > Source) > at org.quicktheories.core.Gen.lambda$mix$10(Gen.java:184) > at org.quicktheories.core.Gen$$Lambda$45/802243390.generate(Unknown > Source) > at org.quicktheories.core.Gen.lambda$flatMap$5(Gen.java:93) > at org.quicktheories.core.Gen$$Lambda$48/363509958.generate(Unknown > Source) > at > org.quicktheories.dsl.TheoryBuilder4.lambda$prgnToTuple$12(TheoryBuilder4.java:188) > at > org.quicktheories.dsl.TheoryBuilder4$$Lambda$40/2003496028.generate(Unknown > Source) > at org.quicktheories.core.DescribingGenerator.generate(Gen.java:255) > at org.quicktheories.core.FilteredGenerator.generate(Gen.java:225) > at org.quicktheories.core.Gen.lambda$map$0(Gen.java:36) > at org.quicktheories.core.Gen$$Lambda$20/71399214.generate(Unknown > Source) > at org.quicktheories.impl.Core.generate(Core.java:150) > at org.quicktheories.impl.Core.shrink(Core.java:103) > at org.quicktheories.impl.Core.run(Core.java:39) > at org.quicktheories.impl.TheoryRunner.check(TheoryRunner.java:35) > at org.quicktheories.dsl.TheoryBuilder4.check(TheoryBuilder4.java:150) > at > org.quicktheories.dsl.TheoryBuilder4.checkAssert(TheoryBuilder4.java:162) > at > org.apache.cassandra.transport.frame.checksum.ChecksummingTransformerTest.corruptionCausesFailure(ChecksummingTransformerTest.java:87) > {code} -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org