BansheeLW opened a new issue, #7633:
URL: https://github.com/apache/apisix/issues/7633
### Current Behavior
The service is configured with a health check. When the upstream node
changes and the concurrent request is bright, there will be a large number of
500 errors（lua entry thread aborted because function 'f' is nil）
### Expected Behavior
The function 'f' should not be nil, the request should be completed normally
### Error Logs
The error log is found as follows:
2022/08/08 10:29:46 [error] 46#46: *144287093 lua entry thread aborted:
runtime error: /usr/local/apisix/apisix/core/config_util.lua:71: attempt to
call local 'f' (a nil value)
stack traceback:
coroutine 0:
/usr/local/apisix/apisix/core/config_util.lua: in function
'cancel_clean_handler'
/usr/local/apisix/apisix/upstream.lua:119: in function
'fetch_healthchecker'
/usr/local/apisix/apisix/upstream.lua:327: in function 'set_upstream'
/usr/local/apisix/apisix/init.lua:515: in function
'http_access_phase'
access_by_lua(nginx.conf:253):2: in main chunk, client:
172.31.xx.xx, server: _, request: "GET xxxxxxx
According to the error message, find the location of the error code:
file path: apisix/core/config_util.lua
function _M.cancel_clean_handler(item, idx, fire)
local f = item.clean_handlers[idx]
core_tab.remove(item.clean_handlers, idx)
if fire then
f(item)
end
end
### Steps to Reproduce
1. Install apisix to EKS using the helm package
2. Service discovery using kubernetes
3. Routed services enable health checks
4. Initiate concurrent requests, no such error message appears
5. Adjust (increase or decrease) upstream nodes, and then initiate
concurrent requests, a large number of such error logs appear, and the
requester receives a large number of 500 errors
### Environment
- APISIX version (run `apisix version`):2.14.1
- Operating system (run `uname -a`): Linux apisix-58d87884d-l4qkw
5.4.129-63.229.amzn2.x86_64 #1 SMP Tue Jul 20 21:22:08 UTC 2021 x86_64 Linux
- 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`):3.4.0
- APISIX Dashboard version, if relevant:2.13.0
- LuaRocks version, for installation issues (run `luarocks --version`): 3.8.0
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