[🐛 BUG]: Stderr "read |0: file already closed" sometimes displayed

[Kaspiman]

No duplicates 🥲.

• I have searched for a similar issue in our bug tracker and didn't find any solutions.

What happened?

A bug happened!

Version (rr --version)

rr version 2023.1.3 (build time: 2023-05-11T12:32:01+0000, go1.20.4), OS: linux, arch: amd64

How to reproduce the issue?

I don't known. It happens sometimes.

The same error message can be seen in this issue in big log output

pipes frame send: write |1: broken pipe and stderr {"error": "read |0: file already closed"}

Relevant log output

/var/www # rr serve -c .rr.yaml
2023-05-21T07:06:21+0000        DEBUG   server          stderr  {"error": "read |0: file already closed"}
handle_serve_command: Function call error:
        got initial serve error from the Vertex *http.Plugin, stopping execution, error: static_pool_allocate_workers: WorkerAllocate: unexpected EOF
/var/www # rr serve -c .rr.yaml
handle_serve_command: Function call error:
        got initial serve error from the Vertex *http.Plugin, stopping execution, error: static_pool_allocate_workers: WorkerAllocate: unexpected EOF
/var/www # rr serve -c .rr.yaml
handle_serve_command: Function call error:
        got initial serve error from the Vertex *http.Plugin, stopping execution, error: static_pool_allocate_workers: WorkerAllocate: unexpected EOF
/var/www # rr serve -c .rr.yaml
handle_serve_command: Function call error:
        got initial serve error from the Vertex *http.Plugin, stopping execution, error: static_pool_allocate_workers: WorkerAllocate: unexpected EOF


##### many runs ago ##########
/var/www # rr serve -c .rr.yaml
handle_serve_command: Function call error:
        got initial serve error from the Vertex *http.Plugin, stopping execution, error: static_pool_allocate_workers: WorkerAllocate: unexpected EOF
/var/www # rr serve -c .rr.yaml
handle_serve_command: Function call error:
        got initial serve error from the Vertex *http.Plugin, stopping execution, error: static_pool_allocate_workers: WorkerAllocate: unexpected EOF
/var/www # rr serve -c .rr.yaml
2023-05-21T07:16:38+0000        DEBUG   server          stderr  {"error": "read |0: file already closed"}
^[[Ahandle_serve_command: Function call error:
        got initial serve error from the Vertex *http.Plugin, stopping execution, error: static_pool_allocate_workers: WorkerAllocate:
        pipes frame send: write |1: broken pipe
/var/www # rr serve -c .rr.yaml
handle_serve_command: Function call error:
        got initial serve error from the Vertex *http.Plugin, stopping execution, error: static_pool_allocate_workers: WorkerAllocate: unexpected EOF

[rustatian]

Hey @embargo2710 👋🏻
This is a DEBUG message, not an error. This can happen with the open FD if you're using max_jobs and the message itself is informational. If your application does not leak memory, do not use this option and do not use the debug log level in production (FYI).