MySQL 9.1 Release Notes
Checkpoints and advancing the checkpoint LSN are not permitted
until redo log recovery is complete and data dictionary dynamic
metadata (srv_dict_metadata) is transferred to
data dictionary table (dict_table_t) objects.
Should the redo log run out of space during recovery or after
recovery (but before data dictionary dynamic metadata is
transferred to data dictionary table objects) as a result of this
change, an innodb_force_recovery
restart may be required, starting with at least the
SRV_FORCE_NO_IBUF_MERGE setting or, in case
that fails, the SRV_FORCE_NO_LOG_REDO setting.
If an innodb_force_recovery
restart fails in this scenario, recovery from backup may be
necessary.