bug: [lua] server-info.lua:216: report(): failed to get lease_id from shdict: nil, context: ngx.timer

[aryayangx-afk]

Current Behavior

After restarting APISIX, sporadic errors occur:
[lua] server-info.lua:216: report(): failed to get lease_id from shdict: nil, context: ngx.timer

1. Out of our 20 APISIX pods, only one pod is reporting this error.
2. Other pods on the same node as the faulty pod are not experiencing this issue.
3. Upon checking basic monitoring for the problematic pod, we found no issues with memory, CPU, or connectivity to etcd.

I want to confirm,

1. What is the cause of this error？
2. what impact does this error have on the overall service?
3. I noticed that server-info is no longer used in newer versions, but we cannot upgrade APISIX at the moment. How can we avoid this issue in our current version

Expected Behavior

There should not be this error

Error Logs

[lua] server-info.lua:216: report(): failed to get lease_id from shdict: nil, context: ngx.timer

Steps to Reproduce

1. kubectl apply -f new apisix deployment yaml

Environment

APISIX version (run apisix version):

3.10.0

• Operating system (run uname -a):

Linux apisix-test-8497c69d5d-9ggxj 6.1.0-18-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.76-1 (2024-02-01) x86_64 GNU/Linux

OpenResty / Nginx version (run openresty -V or nginx -V):

nginx version: openresty/1.25.3.2
built by gcc 10.2.1 20210110 (Debian 10.2.1-6) 
built with OpenSSL 3.2.0 23 Nov 2023
TLS SNI support enabled

etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info):

3.5.16

APISIX Dashboard version, if relevant:

3.0.1

Plugin runner version, for issues related to plugin runners:

Not applicable

LuaRocks version, for installation issues (run luarocks --version):

Not applicable

[Aditya7880900936]

Hi maintainers

I’m interested in taking a look at this issue. I’ll start by trying to reproduce the error on APISIX 3.10.0 and then inspect server-info.lua around the lease_id handling in the timer context.

I’ll update the thread with any findings or questions once I have more clarity.

Please let me know if it’s okay to assign this issue to me. Thanks!

[Baoyuantop]

Hi @aryayangx-afk, the server-info plugin is a pure information reporting plugin. Its sole function is to report APISIX node metadata (such as version number, hostname, startup time, etc.) to etcd for management and monitoring purposes.
This plugin does not participate in any core processes like request forwarding, route matching, or load balancing. Therefore, this error does not impact gateway traffic forwarding. The only issue is that server_info information cannot be obtained through this plugin.

This plugin has been deprecated, and we may not provide a corresponding fix for this issue.