Fix the system hang issue when the app is killed contantly.

fujuntang

2021-11-10 c479ef57baaaa28964fc3ec8d80ff99dffa7d49f

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1. open bus server
2. open two more bus client, sub topic 'news'
3. open a client to pub message constantly
4. Ctl+C to kill a client. The other clients need to receive message normally.