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Storage service uses group0 internally, but group0 is create long after storage service is initialized and passed to it using ss::set_group0() function. What it means is that during shutdown group0 is destroyed before ss::stop() is called and thus storage service is left with a dangling reference. Fix it by introducing a function that cancels all group0 operations and waits for background fibers to complete. For that we need separate abort source for group0 operation which the patch series also introduces. * 'gleb/group0-ss-shutdown' of github.com:scylladb/scylla-dev: storage_service: topology coordinator: ignore abort_requested_exception in background fibers storage_service: fix de-initialization order between storage service and group0_service