bug: apisix cant find upstream and return 500

[cocoonYh]

Issue description

i run apisix with docker for mac, and running server on mac directly.
apisix:2.2-centos
apisix-dashboard:2.3
etcd:3.4.9

Environment

• apisix version (cmd: apisix version): 2.2
• OS (cmd: uname -a): Linux a664481da340 4.19.121-linuxkit
• OpenResty / Nginx version (cmd: nginx -V or openresty -V): nginx version: openresty/1.19.3.1
• etcd version, if have (cmd: run curl http://127.0.0.1:9090/v1/server_info to get the info from server-info API): 3.4.0
• apisix-dashboard version, if have: 2.3

Minimal test code / Steps to reproduce the issue

{ "methods": ["GET"], "uri": "/v1/oms/sub_user", "service_protocol": "grpc", "plugins": { "grpc-transcode": { "proto_id": "1", "service": "oms.SubUserService", "method": "ListSubUser" } }, "upstream_id": "340370032628335311" }

/apisix/upstreams/340370032628335311 {"id":"340370032628335311","create_time":1612405948,"update_time":1612491017,"nodes":[{"host":"docker.for.mac.host.internal","port":9001,"weight":1}],"timeout":{"connect":6000,"read":6000,"send":6000},"type":"roundrobin","pass_host":"pass","name":"sub-user"}

What's the actual result? (including assertion message & call stack if applicable)

got 500 resp, and here is err log
2021/02/05 02:10:23 [error] 43#43: *2543893 failed to run balancer_by_lua*: /usr/local/apisix/apisix/balancer.lua:165: attempt to index local 'up_conf' (a nil value) stack traceback: /usr/local/apisix/apisix/balancer.lua:165: in function 'pick_server' /usr/local/apisix/apisix/balancer.lua:272: in function 'load_balancer' /usr/local/apisix/apisix/init.lua:758: in function 'http_balancer_phase' balancer_by_lua:2: in main chunk while connecting to upstream, client: 172.18.0.1, server: , request: "GET /v1/oms/sub_user HTTP/1.1", host: "127.0.0.1:9080"

What's the expected result?

[Firstsawyou]

It is very similar to the problem here and may have been fixed:
#3342
#3339

Try to configure another host, will this problem still occur?

"nodes":[{"host":"docker.for.mac.host.internal","port":9001,"weight":1}]

[cocoonYh]

It is very similar to the problem here and may have been fixed:
#3342
#3339

Try to configure another host, will this problem still occur?

"nodes":[{"host":"docker.for.mac.host.internal","port":9001,"weight":1}]

i trid 192.168.65.2, it doesnt work either

[membphis]

@cocoonYh you can make a try with the master branch

[spacewander]

Closed as lack of response.