claude-code - 💡(How to fix) Fix [BUG]Claude Code hangs silently on startup — Jetson Orin AGX (JetPack R36.4.7, linux-arm64) [1 comments, 2 participants]

Preflight Checklist

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

What's Wrong?

Environment

claude hangs indefinitely on startup with no output and no error message. The process must be killed with Ctrl+C.

Key observations:

• claude --version returns immediately and correctly (2.1.140 (Claude Code))
• claude --print "hello" exits silently with code 0, no output
• CLAUDE_LOG_LEVEL=debug claude produces no output before hanging
• claude config list hangs
• claude auth login completes successfully; credentials are saved and valid
• OAuth token works — direct curl calls to api.anthropic.com/v1/models return a valid response
• Multiple simultaneous curl connections to api.anthropic.com all succeed
• The hang occurs on both native installer and npm install paths
• Reinstalling from scratch (rm -rf ~/.claude + fresh npm install) does not fix it

Diagnostics

strace — threads deadlocked in futex

timeout 10 strace -f claude --print "hello" 2>&1 | tail -20

All threads exit via futex wait timeout — the process deadlocks during startup and is killed by timeout with exit code 0.

Network connections (strace -e trace=network)

Claude Code opens 3 simultaneous connections to api.anthropic.com (160.79.104.10:443), all stuck in EINPROGRESS:

[pid N] connect(16, {AF_INET, 160.79.104.10, port 443}) = -1 EINPROGRESS
[pid N] connect(17, {AF_INET, 160.79.104.10, port 443}) = -1 EINPROGRESS
[pid N] connect(19, {AF_INET, 160.79.104.10, port 443}) = -1 EINPROGRESS

Only api.anthropic.com is contacted — no other domains. DNS resolves correctly.

statsig / sentry

statsig.anthropic.com and sentry.io do not respond (curl hangs). Blocking both via /etc/hosts did not resolve the startup hang.

Confirmed working

• curl -s https://api.anthropic.com — returns immediately ✅
• 3 parallel curl connections to api.anthropic.com — all succeed ✅
• OAuth token authenticated and valid ✅
• claude --version — returns immediately ✅

Root cause hypothesis

The hang appears to be in the Bun runtime's event loop / TLS connection handling on the Jetson Orin's out-of-tree kernel. This is consistent with issue #35454 (gVisor ARM64 epoll_pwait hang) — the Jetson OOT kernel may have similar issues with how Bun's io_uring/epoll event loop initializes concurrent TLS connections on non-standard arm64 kernels.

Unlike a standard arm64 Linux system, the Jetson runs L4T with an out-of-tree kernel variant which may not support all the io_uring or epoll features Bun relies on.

What Should Happen?

Claude Code should launch the interactive TUI and respond to prompts normally, as it does on standard arm64 Linux.

Error Messages/Logs

Steps to Reproduce

1. Set up a Jetson Orin AGX with JetPack R36.4.7 (L4T, kernel variant: oot)
2. Install Node.js v22, npm 10
3. npm install -g @anthropic-ai/claude-code
4. claude auth login (complete OAuth flow)
5. claude — hangs indefinitely
6. claude --print "hello" — exits silently, no output, exit code 0

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.140

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Terminal.app (macOS)

Additional Information

This platform (Jetson Orin AGX) is widely used for edge AI development and is a natural fit for Claude Code. The issue has persisted across multiple versions and reinstalls. A previous version worked once after a clean reinstall but the fix was not reproducible.

Related issues: #35454 (gVisor ARM64 epoll), #29652 (startup hang after update)