openresty / openresty/lua-nginx-module
Require file with coroutine startup causes error
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Description
test.lua:
coroutine.wrap(function() print("hello") end)()
Requiring with luajit:
$ luajit -e "require'test'"
hello
Requiring in content_by_lua_block:
http {
server {
listen 8080;
lua_code_cache off;
location / {
content_by_lua_block {
require("test")
}
}
}
}
$ curl localhost:8080
500 error html page
Error log:
2025/04/06 18:49:55 [error] 2931732#0: *2 lua entry thread aborted: runtime error: attempt to yield across C-call boundary
stack traceback:
coroutine 0:
[C]: in function 'require'
content_by_lua(nginx.conf:15):2: in main chunk, client: 127.0.0.1, server: , request: "GET / HTTP/1.1", host: "localhost:8080"
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the test.lua coroutine example and reproduce it through the content_by_lua_block configuration, comparing it with direct luajit require behavior. Read the error log's require and lua entry thread traceback first. Done means requiring this module no longer produces the C-call-boundary yield error in the shown NGINX request path.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- lua, nginx
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100