only close LogDriver after LogCopier is done

this prevents the copier from sending messages in the buffer to the closed
driver. If the copied took longer than the timeout to drain the buffer, this
aborts the copier read loop and return back so we can cleanup resources
properly.

Signed-off-by: Daniel Dao <dqminh@cloudflare.com>

container/monitor.go

@@ -369,6 +369,9 @@ func (m *containerMonitor) resetContainer(lock bool) {
 			select {
 			case <-time.After(loggerCloseTimeout):
 				logrus.Warnf("Logger didn't exit in time: logs may be truncated")
+				container.LogCopier.Close()
+				// always waits for the LogCopier to finished before closing
+				<-exit
 			case <-exit:
 			}
 		}