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Migration manager depends on storage service. For instance, it has a reload_schema_in_bg background task which calls _ss.local() so it expects that storage service is not stopped before it stops. To solve this we use permit approach, and during storage_service stop: - we ignore *new* code execution in migration_manager which'd use storage_service - but wait with storage_service shutdown until all *existing* executions are done Fixes scylladb/scylladb#26734 Backport: no need, problem existed since very long time, code restructure in https://github.com/scylladb/scylladb/commit/389afcd (and following commits) made it hitting more often, as _ss was called earlier, but it's not released yet. Closes scylladb/scylladb#26779 * github.com:scylladb/scylladb: service: attach storage_service to migration_manager using pluggabe service: migration_manager: corutinize merge_schema_from service: migration_manager: corutinize reload_schema