Dawid Weiss commented on LUCENE-8203:

bq. The test rule in TestRuleTemporaryFilesCleanup doesn't list them...

Sorry, I was wrong: it does list them (it's the list in the exception). I've no 
idea what's causing this though (and I'm running tests on Windows 10 myself).

> Windows failures when removing test directories
> -----------------------------------------------
>                 Key: LUCENE-8203
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8203
>             Project: Lucene - Core
>          Issue Type: Test
>            Reporter: Adrien Grand
>            Priority: Minor
> I was looking at Lucene failures of Policeman Jenkins' Windows job 
> (https://jenkins.thetaphi.de/job/Lucene-Solr-master-Windows) and they all 
> fail  when cleaning up temporary files/dirs used for testing, eg.
> {noformat}
> [junit4] ERROR   0.00s J1 | TestBoolean2 (suite) <<<
>    [junit4]    > Throwable #1: java.io.IOException: Could not remove the 
> following files (in the order of attempts):
>    [junit4]    >    
> C:\Users\jenkins\workspace\Lucene-Solr-master-Windows\lucene\build\core\test\J1\temp\lucene.search.TestBoolean2_B7B1F66EB9785AE1-001\tempDir-001:
>  java.nio.file.AccessDeniedException: 
> C:\Users\jenkins\workspace\Lucene-Solr-master-Windows\lucene\build\core\test\J1\temp\lucene.search.TestBoolean2_B7B1F66EB9785AE1-001\tempDir-001
>    [junit4]    >    
> C:\Users\jenkins\workspace\Lucene-Solr-master-Windows\lucene\build\core\test\J1\temp\lucene.search.TestBoolean2_B7B1F66EB9785AE1-001:
>  java.nio.file.DirectoryNotEmptyException: 
> C:\Users\jenkins\workspace\Lucene-Solr-master-Windows\lucene\build\core\test\J1\temp\lucene.search.TestBoolean2_B7B1F66EB9785AE1-001
>    [junit4]    >      at 
> __randomizedtesting.SeedInfo.seed([B7B1F66EB9785AE1]:0)
>    [junit4]    >      at org.apache.lucene.util.IOUtils.rm(IOUtils.java:329)
>    [junit4]    >      at java.lang.Thread.run(Thread.java:748)
> {noformat}
> Has anyone ideas what the problem is? At first sight it looks:
>  - not due to unclosed index inputs or MockDirectoryWrapper would barf too
>  - not related to the unmap hack since we have failures on tests that do not 
> use MmapDirectory at all like TestNIOFSDirectory
>  - not due to the fact that we do not release resources in a try/finally or 
> try-with-resources block or junit would report the exception that prevented 
> the dir/input from being closed as well
> It's also surprising how it sometimes fails with a DirectoryNotEmptyException 
> without reporting issues about deleting inner files of the directory.
> I don't have much background on this issue so I could easily have missed 
> something.

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