connection in unexpected state after initialization: %s

Error message

connection in unexpected state after initialization: %s

What it means

Error "connection in unexpected state after initialization: %s" thrown in go-redis/redis.

Source

Thrown at redis.go:708

				}
				if cancel != nil {
					defer cancel()
				}

				finalState, err := cn.GetStateMachine().AwaitAndTransition(
					waitCtx,
					[]pool.ConnState{pool.StateIdle, pool.StateInUse},
					pool.StateIdle, // Target is IDLE (but we're already there, so this is a no-op)
				)
				if err != nil {
					return err
				}
				// Verify we're now initialized
				if finalState == pool.StateIdle || finalState == pool.StateInUse {
					return nil
				}
				// Unexpected state after waiting
				return fmt.Errorf("connection in unexpected state after initialization: %s", finalState)
			}

			// Unexpected state (CLOSED, UNUSABLE, etc.)
			return err
		}
	}

	// At this point, we're in INITIALIZING state and we own the initialization
	// If we fail, we must transition to CLOSED
	var initErr error
	connPool := pool.NewSingleConnPool(c.connPool, cn)
	// The handshake Conn (handed to OnConnect) must share the client's
	// HIMPORT registry: a private registry restarts versions at 1, so an
	// OnConnect prepare would mark the pooled connection with a version
	// number that collides with the client registry's and silently skips
	// the replay of a different fieldset definition.
	conn := newConn(c.opt, connPool, &c.hooksMixin, c.himport)
	// The internal wrapper does not serve cached reads, but it needs the

View on GitHub (pinned to 36d97525cd)

Solutions

Recreate the client; a connection ended initialization in the state shown in the error
Check OnConnect hooks and credential providers for errors leaving conns in odd states

When it happens

Trigger: Thrown at redis.go:708 when the library encounters an invalid state.

Common situations: Keep OnConnect hooks minimal and error-propagating so init failures are explicit.

AI-assisted analysis of go-redis/redis@36d97525cd (2026-08-06). Data as JSON: /data/errors/ef618324cd1249cc.json. Report an issue: GitHub.