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…lanceScheduler `~SubscribeSentinel()` calls `storage_->Stop();` that calls `rebalance_scheduler_.reset()`; after that `~SubscribeSentinel()` resets the `Sentinel::impl_`. After `rebalance_scheduler_.reset()` but before `Sentinel::impl_.reset()` a `topology_holder_` may gen a notification that calls `sentinel_obj_.Notify*` that calls `rebalance_scheduler_->Rebalance*`: ``` #0 0x7f4fbe737fc4 in __pthread_mutex_lock #1 0xd928c8 in __libcpp_mutex_lock #2 0xd928c8 in std::__y1::mutex::lock() #3 0x224289b in lock_guard #4 0x224289b in storages::redis::impl::SubscriptionRebalanceScheduler::RequestRebalance(std::__y1::unordered_map<storages::redis::ServerId, unsigned long, storages::redis::ServerIdHasher, std::__y1::equal_to<storages::redis::ServerId>, std::__y1::allocator<std::__y1::pair<storages::redis::ServerId const, unsigned long>>>) /userver/redis/src/storages/redis/impl/subscription_rebalance_scheduler.cpp:37:43 #5 0x22369e9 in storages::redis::impl::ClusterSubscriptionStorage::RequestRebalance(unsigned long, std::__y1::unordered_map<storages::redis::ServerId, unsigned long, storages::redis::ServerIdHasher, std::__y1::equal_to<storages::redis::ServerId>, std::__y1::allocator<std::__y1::pair<storages::redis::ServerId const, unsigned long>>>) /userver/redis/src/storages/redis/impl/cluster_subscription_storage.cpp:139:27 #6 0x223019f in storages::redis::impl::SubscribeSentinel::RebalanceSubscriptions(unsigned long) /userver/redis/src/storages/redis/impl/subscribe_sentinel.cpp:171:15 #7 0x2193ccd in operator() /userver/redis/src/storages/redis/impl/cluster_sentinel_impl.cpp:885:27 #8 0x2193ccd in boost::detail::function::void_function_obj_invoker<storages::redis::impl::ClusterSentinelImpl::Init()::$_0, void, std::__y1::basic_string<char, std::__y1::char_traits<char>, std::__y1::allocator<char>>, storages::redis::RedisState>::invoke(boost::detail::function::function_buffer&, std::__y1::basic_string<char, std::__y1::char_traits<char>, std::__y1::allocator<char>>, storages::redis::RedisState) ``` We must call Stop() instead of reset. `ClusterSentinelImpl::Stop()` does a blocking `ev_thread_.Run*`, so all the signal callbacks finish execution before destruction. Tests: протестировано локально и в CI commit_hash:c731ae2859d6acde9605e2c526cd9ac20f15e4e8
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