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MDEV-13520 InnoDB attempts UPDATE with DB_TRX_ID=0 if innodb_force_re…
…covery=3 trx_set_rw_mode(): Check the flag high_level_read_only instead of testing srv_force_recovery (innodb_force_recovery) directly. There is no need to prevent the creation of read-write transactions if innodb_force_recovery=3 is used. Yes, in that mode any recovered incomplete transactions will not be rolled back, but these transactions will continue to hold locks on the records that they have modified. If the new read-write transactions hit conflicts with already existing (possibly recovered) transactions, the lock wait timeout mechanism will work just fine.
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