[BUG] bash commands timeout on linux

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When trying to run claude code and it tries to interact with the system with basic shell commands such as ls, echo etc they timeout after about 30 seconds. In a normal terminal (kitty) the commands run instantly.

I did some work with claude to try to diagnose the problem and had it search the code base for the bug based on the diagnosis of my system. See attached files. Hopefully this helps to fix this issue.

What Should Happen?

claude should run shell commands instantly

Error Messages/Logs

Steps to Reproduce

in terminal (kitty) using bash
run 'claude'

ask claude to run a shell command such as echo.

It will just hang.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.20 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Xterm

Additional Information

DIAGNOSIS.md
BUG-ANALYSIS.md