Agent stuck on "Waited for background terminal" after command finishes #14314

What version of Codex CLI is running?

0.114.0

What subscription do you have?

plus

Which model were you using?

gpt-5.4 xhigh

What platform is your computer?

Linux 6.12.73+deb13-amd64 x86_64 unknown

What terminal emulator and version are you using (if applicable)?

terminator 2.1.4 (on debian)

What issue are you seeing?

The agent ran a background command (cargo clippy --manifest-path src-tauri/Cargo.toml --all-targets -- -D warnings). The command finished execution and printed a compilation error to the terminal. However, the agent failed to detect the completion or read the output. Instead, it got stuck in an infinite loop, continuously logging • Waited for background terminal until I manually interrupted the process.

What steps can reproduce the bug?

Ask the agent to run a background command that results in a compilation error (in my case, cargo clippy).

The terminal successfully outputs the compilation error.

Observe the agent failing to read the output and continuously logging "Waited for background terminal".

Uploaded thread: 019cd87a-6be6-7662-8cec-0dfd3a6b6ee3

What is the expected behavior?

The agent should successfully detect when the background terminal process finishes, read the output (the compilation error), and proceed to analyze or fix the error instead of getting stuck in a waiting loop.

Additional information

No response