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MDEV-30860 Race condition between buffer pool flush and log file dele…
…tion in mariadb-backup --prepare srv_start(): If we are going to close the log file in mariadb-backup --prepare, call buf_flush_sync() before calling recv_sys.debug_free() to ensure that the log file will not be accessed. This fixes a rather rare failure in the test mariabackup.innodb_force_recovery where buf_flush_page_cleaner() would invoke log_checkpoint_low() because !recv_recovery_is_on() would hold due to the fact that recv_sys.debug_free() had already been called. Then, the log write for the checkpoint would fail because srv_start() had invoked log_sys.log.close_file().
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