yangxikun opened a new issue #3695:
URL: https://github.com/apache/apisix/issues/3695
### Issue description
error log: upstream timeout config is 6s
```text
2021/02/27 11:37:07 [info] 51#51: *2258 [lua] balancer.lua:190:
pick_server(): >>>>>{"read":6000,"connect":6000,"send":6000} while connecting
to upstream, client: 192.17.0.1, server: , request: "GET
/api/v1/admin/navigation HTTP/1.1", host: "lx.net", referrer:
"http://lx.net/admin";
```
access log: request_time is 10.201
```text
{
"@timestamp": "2021-02-27T11:37:18+00:00",
"time_local": "27/Feb/2021:11:37:18 +0000",
"remote_user": "-",
"http_x_forwarded_for": "-",
"host": "192.17.5.11",
"domain": "lx.net",
"remote_addr": "192.17.0.1",
"http_x_real_ip": "-",
"body_bytes_sent": 1549,
"request_time": 10.201,
"status": 200,
"upstream_name": "-",
"upstream_response_time": "10.202",
"upstream_response_status": "200",
"request": "GET /api/v1/admin/navigation HTTP/1.1",
"http_referer": "http://lx.net/admin";,
"x-request-id": "5e9e1fe70ce3eb86c6a2471feb051c40",
"x-gateway-enviroment": "heimdall-local",
"http_user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 11_1_0)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.192 Safari/537.36"
}
```
### Environment
* apisix version (cmd: `apisix version`): 2.2
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