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In fts_optimize_remove_table(), InnoDB tries to access the fts_optimize_wq
after shutdown the fts optimize thread. It affects debug build only
The following code fails:
ut_d(mutex_enter(&fts_optimize_wq->mutex));
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ut_ad(!table->fts->in_queue);
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ut_d(mutex_exit(&fts_optimize_wq->mutex));
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The issue was caused by the following commit:
commit a41d429765c7ddb528b9b438c68b25ff55d3bd55
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Author: Thirunarayanan Balathandayuthapani <thiru@mariadb.com>
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Date: Tue Oct 22 12:05:42 2019 +0530
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MDEV-20621 FULLTEXT INDEX activity causes InnoDB hang
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