[BUG]Claude Code hangs silently on startup — Jetson Orin AGX (JetPack R36.4.7, linux-arm64)

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?

Environment

| Field | Value |
|---|---|
| Claude Code version | 2.1.140 |
| Install method | npm install -g @anthropic-ai/claude-code |
| Platform | linux-arm64 |
| Hardware | NVIDIA Jetson Orin AGX |
| OS | Ubuntu (L4T) — JetPack R36, REVISION 4.7 |
| Kernel variant | oot (out-of-tree) |
| Node.js | v22.21.0 |
| npm | 10.9.4 |

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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

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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 ✅

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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.

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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)