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

fujuntang

2021-11-10 c479ef57baaaa28964fc3ec8d80ff99dffa7d49f

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ipcrm -a
 
./dgram_mod_req_rep server 2 & node0=$! && sleep 1
./dgram_mod_req_rep client 2 node1
kill $node0