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https://issues.apache.org/jira/browse/CALCITE-6602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17885483#comment-17885483
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Julian Hyde commented on CALCITE-6602:
--------------------------------------
Investigations using {{git bisect}} reveal that this issue was introduced in
the fix for CALCITE-6464.
> Deadlock while loading class SqlTypeFixture
> -------------------------------------------
>
> Key: CALCITE-6602
> URL: https://issues.apache.org/jira/browse/CALCITE-6602
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.37.0
> Reporter: Julian Hyde
> Priority: Major
>
> I am seeing deadlocks during initialization of {{interface
> RelDataTypeSystem}} and {{class RelDataTypeSystemImpl}}. The command
> {{./gradlew :core:test --tests RelDataTypeSystemTest}} hangs about 90% of the
> time for me. Here's part of the thread dump running under JDK 21.
>
> {noformat}
> "ForkJoinPool-1-worker-7" #30 [1161671] daemon prio=5 os_prio=0 cpu=8.26ms
> elapsed=19.26s tid=0x00007d08b0000ff0 nid=1161671 waiting on condition
> [0x00007d098b3fd000]
> java.lang.Thread.State: RUNNABLE
> at
> org.apache.calcite.sql.type.SqlTypeFixture.<init>(SqlTypeFixture.java:28)
> - waiting on the Class initialization monitor for
> org.apache.calcite.rel.type.RelDataTypeSystem
> at
> org.apache.calcite.sql.type.RelDataTypeSystemTest$Fixture.<init>(RelDataTypeSystemTest.java:143)
> at
> org.apache.calcite.sql.type.RelDataTypeSystemTest.testCustomDecimalModReturnTypeInference(RelDataTypeSystemTest.java:310)
> at
> java.lang.invoke.LambdaForm$DMH/0x00007d0934160400.invokeVirtual(java.base@21/LambdaForm$DMH)
> ...
> at
> java.util.concurrent.ForkJoinWorkerThread.run(java.base@21/ForkJoinWorkerThread.java:188)
> "ForkJoinPool-1-worker-8" #31 [1161672] daemon prio=5 os_prio=0 cpu=7.33ms
> elapsed=19.26s tid=0x00007d08a8000ff0 nid=1161672 waiting on condition
> [0x00007d098b2fc000]
> java.lang.Thread.State: RUNNABLE
> at
> org.apache.calcite.rel.type.RelDataTypeSystem.<clinit>(RelDataTypeSystem.java:38)
> - waiting on the Class initialization monitor for
> org.apache.calcite.rel.type.RelDataTypeSystemImpl
> at
> org.apache.calcite.sql.type.SqlTypeFixture.<init>(SqlTypeFixture.java:28)
> at
> org.apache.calcite.sql.type.RelDataTypeSystemTest$Fixture.<init>(RelDataTypeSystemTest.java:143)
> at
> org.apache.calcite.sql.type.RelDataTypeSystemTest.testDecimalModReturnTypeInference(RelDataTypeSystemTest.java:229)
> ... {noformat}
>
> Occurs in current main (commit
> [a8802c7|https://github.com/apache/calcite/commit/a8802c721a2805159d166e45044c00364d1cb6c3]).
> Not a high priority. Just documenting that this bug exists. Hopefully it only
> exists when running tests.
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