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ERROR 1071 with mysql_upgrade



I'm trying to upgrade a MariaDB 10.2 server to 10.4.6 on FreeBSD.

When running the mysql_update command, it dies with:

$ mysql_upgrade 
Phase 1/7: Checking and upgrading mysql database
Processing databases
mysql.column_stats                                 OK
mysql.columns_priv                                 OK
mysql.db                                           OK
mysql.event                                        OK
mysql.func                                         OK
mysql.global_priv                                  OK
mysql.gtid_slave_pos                               OK
mysql.help_category                                OK
mysql.help_keyword                                 OK
mysql.help_relation                                OK
mysql.help_topic                                   OK
mysql.index_stats                                  OK
mysql.innodb_index_stats                           OK
mysql.innodb_table_stats                           OK
mysql.plugin                                       OK
mysql.proc                                         OK
mysql.procs_priv                                   OK
mysql.proxies_priv                                 OK
mysql.roles_mapping                                OK
mysql.servers                                      OK
mysql.table_stats                                  OK
mysql.tables_priv                                  OK
mysql.time_zone                                    OK
mysql.time_zone_leap_second                        OK
mysql.time_zone_name                               OK
mysql.time_zone_transition                         OK
mysql.time_zone_transition_type                    OK
mysql.transaction_registry                         OK
Phase 2/7: Installing used storage engines... Skipped
Phase 3/7: Fixing views
mysql.user                                         OK
Phase 4/7: Running 'mysql_fix_privilege_tables'
ERROR 1071 (42000) at line 437: Specified key was too long; max key length is 1000 bytes
FATAL ERROR: Upgrade failed

Adding verbose option does not give more hints, and the failing SQL statement doesn't seem to be logged with full query logging turned on.

How do I debug this? I can't even see which table or column it's complaining about. I don't remember fiddling with collation or character sets on system tables.

Kind regards,

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