[BUG] Bash tool hangs indefinitely (~25s timeout) when working directory is on NFS mount

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?

Version: 2.1.68 (native installer, Bun runtime)
OS: Linux (HPC cluster, RHEL 9 — kernel 5.14.0-570.58.1.el9_6.x86_64)

Description:
When Claude Code is launched from an NFS-mounted working directory, the Bash tool appears to hang silently — no output is produced, no permission prompt appears, and the command
eventually times out (~25s). The tool shows "running" status throughout.

Environment:

• Working directory: NFS mount (/nfs/hpc/share/user_name/dir_name/dir_name)
• Home directory: also NFS (/nfs/stak/users/user_name/)
• settings.json: {"skipDangerousModePermissionPrompt": true}

What was ruled out:

• Slow shell initialization — ruled out by testing
• Permission prompt accidentally dismissed — no prompt appears at all
• Network connectivity — other tools (Read, Glob, Grep, Write) all work correctly

Comparison:
Cursor Agent on the same machine and same directory executes shell commands with no issues.

Additional context from debug logs (~/.claude/debug/):
The earlier session (68528c6a) shows an OOM error during a self-update download, suggesting Bun may have memory constraints on this system that could also affect subprocess
spawning.

What Should Happen?

Claude should be able to execute bash commands with no problem

Error Messages/Logs

Steps to Reproduce

1. Launch claude from an NFS-mounted directory on a Linux HPC cluster
2. Ask Claude to run any shell command (e.g. nvidia-smi)
3. Observe: command shows "running", no output, eventually times out

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

v2.1.70

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_