bug: 2.11.0 worker process is always shutting down

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Current Behavior

when i reload apisix the old process is always shutting down and not exit

Expected Behavior

the old process should exited

Error Logs

No response

Steps to Reproduce

yum install apisix-2.11.0-0.el7.x86_64 apisix-dashboard-2.11-0.el7.x86_64 apisix-base-1.19.9.1.6-0.el7.x86_64 apache-apisix-repo-1.0-1.noarch

Environment

• APISIX version (run apisix version): 2.11.0
• Operating system (run uname -a): CentOS Linux release 7.7.1908
• OpenResty / Nginx version (run openresty -V or nginx -V): nginx version: openresty/1.19.9.1
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info): etcd_version":"3.4.0"
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version): /usr/local/bin/luarocks 3.8.0