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RPL_SEMI_SYNC_MASTER_ENABLED OFF. Problem: ======= If master is waiting for a reply from slave, at this time set global rpl_semi_sync_master_enabled=OFF, the master server will crash. Analysis: ======== When master is waiting for a reply from slave, at this time if semi sync is switched off on master, during switch off if active transactions are present the transactions will be cleared and "active_tranxs_" variable will be set to NULL. When the waiting master connection finds that semi sync is switched of it tries to access "active_tranxs_" without checking if the transaction list exists or not. Accessing NULL transaction list causes the crash. Fix: === A check has been added to see a valid list exists before accessing the "active_tranxs_".