Failed to add dcb to epoll set

2018-07-18 17:54:57   error  : (1) Failed to write message: 11, Resource temporarily unavailable

2018-07-18 17:54:57   error  : (1) Could not post task to add DCB to worker.

2018-07-18 17:54:57   error  : (1) [mariadbclient] Failed to add dcb 0x7f74606da970 for fd 1897 to epoll set.

  ssize_t n = write(m_write_fd, &message, sizeof(message)); // Maybe should retry on error EAGAIN