still trying (in vain) to make this fail on my setup...

The one line that looks suspicious from your stack trace is:

!!!! WARNING: best effort to remove
C:\DOCUME~1\Yonik\LOCALS~1\Temp\org.apache.solr.update.AutoCommitTest-testMaxDocs-1170627577515
FAILED !!!!!

can you delete the directory where solr stores the testing index manually?

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