RFR: 8224968: javax/swing/JColorChooser/Test6827032.java times out in Windows 10

[Alexey Ivanov]

On Fri, 28 Feb 2025 15:42:51 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> **Problem:**
> 
> The test hangs intermittently when run on Windows. (In some cases, handling the timeout takes 2 hours.)
> 
> Thread dump shows no AWT threads, yet jtreg harness still waits for the test thread to finish, in particular it waits for [`StreamCopier`](https://github.com/openjdk/jtreg/blob/759946dedbafa423552851ecb98bc3bb8dcf30ec/src/share/classes/com/sun/javatest/regtest/exec/ProcessCommand.java#L279-L281). See `threaddump.log` attached to the bug and [my comment](https://bugs.openjdk.org/browse/JDK-8224968?focusedId=14757188&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14757188) for more details.
> 
> **Fix, or Workaround:**
> 
> Drag mouse for a short while.
> 
> In my testing on CI, the `javax/swing/JColorChooser/Test6827032.java` failed on Windows *3 times* out of 6 runs with 20 repeats (`JTREG=REPEAT_COUNT=20`) without the fix.
> 
> There have been no failures after the fix in 10 runs with 20 repeats.

This needs more investigation…

I can see the same thread dumps in the CI where the test gets stuck in AWT shutdown.

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PR Comment: https://git.openjdk.org/jdk/pull/23846#issuecomment-2775859211