@@ -80,6 +80,7 @@ type containerMonitor struct {

 // StartMonitor initializes a containerMonitor for this container with the provided supervisor and restart policy

 // and starts the container's process.

 func (container *Container) StartMonitor(s supervisor, policy container.RestartPolicy) error {

+	container.Lock()

 	container.monitor = &containerMonitor{

 		supervisor:    s,

 		container:     container,

@@ -88,6 +89,7 @@ func (container *Container) StartMonitor(s supervisor, policy container.RestartP

 		stopChan:      make(chan struct{}),

 		startSignal:   make(chan struct{}),

 	}

+	container.Unlock()

 	return container.monitor.wait()

 }

@@ -157,6 +159,8 @@ func (m *containerMonitor) start() error {

 		}

 		m.Close()

 	}()

+

+	m.container.Lock()

 	// reset stopped flag

 	if m.container.HasBeenManuallyStopped {

 		m.container.HasBeenManuallyStopped = false

@@ -171,16 +175,20 @@ func (m *containerMonitor) start() error {

 		if err := m.supervisor.StartLogging(m.container); err != nil {

 			m.resetContainer(false)

+			m.container.Unlock()

 			return err

 		}

 		pipes := execdriver.NewPipes(m.container.Stdin(), m.container.Stdout(), m.container.Stderr(), m.container.Config.OpenStdin)

+		m.container.Unlock()

 		m.logEvent("start")

 		m.lastStartTime = time.Now()

+		// don't lock Run because m.callback has own lock

 		if exitStatus, err = m.supervisor.Run(m.container, pipes, m.callback); err != nil {

+			m.container.Lock()

 			// if we receive an internal error from the initial start of a container then lets

 			// return it instead of entering the restart loop

 			// set to 127 for container cmd not found/does not exist)

@@ -190,6 +198,7 @@ func (m *containerMonitor) start() error {

 				if m.container.RestartCount == 0 {

 					m.container.ExitCode = 127

 					m.resetContainer(false)

+					m.container.Unlock()

 					return derr.ErrorCodeCmdNotFound

 				}

 			}

@@ -198,6 +207,7 @@ func (m *containerMonitor) start() error {

 				if m.container.RestartCount == 0 {

 					m.container.ExitCode = 126

 					m.resetContainer(false)

+					m.container.Unlock()

 					return derr.ErrorCodeCmdCouldNotBeInvoked

 				}

 			}

@@ -206,11 +216,13 @@ func (m *containerMonitor) start() error {

 				m.container.ExitCode = -1

 				m.resetContainer(false)

+				m.container.Unlock()

 				return derr.ErrorCodeCantStart.WithArgs(m.container.ID, utils.GetErrorMessage(err))

 			}

+			m.container.Unlock()

 			logrus.Errorf("Error running container: %s", err)

-		}

+		} // end if

 		// here container.Lock is already lost

 		afterRun = true

@@ -231,13 +243,14 @@ func (m *containerMonitor) start() error {

 			if m.shouldStop {

 				return err

 			}

+			m.container.Lock()

 			continue

 		}

 		m.logEvent("die")

 		m.resetContainer(true)

 		return err

-	}

+	} // end for

 }

 // resetMonitor resets the stateful fields on the containerMonitor based on the

@@ -319,7 +332,7 @@ func (m *containerMonitor) callback(processConfig *execdriver.ProcessConfig, pid

 		}

 	}

-	m.container.SetRunning(pid)

+	m.container.SetRunningLocking(pid)

 	// signal that the process has started

 	// close channel only if not closed

@@ -179,6 +179,13 @@ func (s *State) getExitCode() int {

 	return res

 }

+// SetRunningLocking locks container and sets it to "running"

+func (s *State) SetRunningLocking(pid int) {

+	s.Lock()

+	s.SetRunning(pid)

+	s.Unlock()

+}

+

 // SetRunning sets the state of the container to "running".

 func (s *State) SetRunning(pid int) {

 	s.Error = ""

@@ -192,7 +199,7 @@ func (s *State) SetRunning(pid int) {

 	s.waitChan = make(chan struct{})

 }

-// SetStoppedLocking locks the container state is sets it to "stopped".

+// SetStoppedLocking locks the container state and sets it to "stopped".

 func (s *State) SetStoppedLocking(exitStatus *execdriver.ExitStatus) {

 	s.Lock()

 	s.SetStopped(exitStatus)

@@ -129,9 +129,15 @@ func (daemon *Daemon) containerStart(container *container.Container) (err error)

 	mounts = append(mounts, container.TmpfsMounts()...)

 	container.Command.Mounts = mounts

+	container.Unlock()

+

+	// don't lock waitForStart because it has potential risk of blocking

+	// which will lead to dead lock, forever.

 	if err := daemon.waitForStart(container); err != nil {

+		container.Lock()

 		return err

 	}

+	container.Lock()

 	container.HasBeenStartedBefore = true

 	return nil

 }