[MDEV-23856] fts_optimize_wq accessed after shutdown of FTS Optimize thread - Jira

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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));

        ut_ad(!table->fts->in_queue);

        ut_d(mutex_exit(&fts_optimize_wq->mutex));

The issue was caused by the following commit:

commit a41d429765c7ddb528b9b438c68b25ff55d3bd55

Author: Thirunarayanan Balathandayuthapani <thiru@mariadb.com>

Date:   Tue Oct 22 12:05:42 2019 +0530

    MDEV-20621 FULLTEXT INDEX activity causes InnoDB hang

is caused by

MDEV-20621 FULLTEXT INDEX activity causes InnoDB hang