Ceph » mgr

Problematic part in PyModuleRegistry::unregister_client():

  void unregister_client(std::string_view name, const entity_addrvec_t& addrs)
  {
    auto itp = clients.equal_range(std::string(name));
    for (auto it = itp.first; it != itp.second; ++it) {
      if (it->second == addrs) {
    it = clients.erase(it);
      }
    }
  }

The iterator gets incremented even after removing an entry from the map (which returns the next iterator).

This causes calls to unregister_client() to endlessly loop causing ceph-mgr to become unresponsive and getting blocklisted causing subsequent commands to hang.