RFR: 8311989: Test java/lang/Thread/virtual/Reflection.java timed out

[Mandy Chung]

On Fri, 28 Jul 2023 15:44:54 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> This is a test only change to a test that exercises core reflection from virtual threads. One of the tests (testNewInstance6) uses a custom scheduler in setup to check that calling a constructor reflectively, where the constructor parks, doesn't pin the underlying carrier. The test schedules an unpark from a virtual thread but the test is missing a call to Thread::join, thus creating a race between shutdown of the scheduler and the unpark. Two sightings of the test failing so far, both -Xcomp and ZGC.
> 
> While in the area, two usages of Thread.sleep in the test have been replaced with latches.

Marked as reviewed by mchung (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15073#pullrequestreview-1555344119