[BUG]

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?

After an automatic update to Claude Code v2.1.15, the CLI fails to start with the following error:

warn: CPU lacks AVX support, strange crashes may occur. Reinstall Bun or use *-baseline build:
  https://github.com/oven-sh/bun/releases/download/bun-v1.3.6/bun-darwin-x64-baseline.zip
error: Invalid DNS result order.

This issue occurs only in v2.1.15 and does not occur in the previous version (v2.1.14), indicating a clear regression.
Rolling back to v2.1.14 immediately restores normal behavior.

What Should Happen?

Claude Code should start normally without DNS-related errors, as it does in v2.1.14, on the same machine and environment.

Error Messages/Logs

warn: CPU lacks AVX support, strange crashes may occur. Reinstall Bun or use *-baseline build:
  https://github.com/oven-sh/bun/releases/download/bun-v1.3.6/bun-darwin-x64-baseline.zip
error: Invalid DNS result order.

Steps to Reproduce

1. Allow Claude Code to auto-update to v2.1.15.
2. Run claude from the terminal.
3. Observe startup failure with error: Invalid DNS result order.

Rollback verification

1. Replace the symlink to point back to v2.1.14:

``
ln -sf ~/.local/share/claude/versions/2.1.14 ~/.local/bin/claude
``

1. Run claude --version.
2. Claude Code starts normally and reports v2.1.14.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.14

Claude Code Version

Claude Code v2.1.15 (fails to start)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Warp

Additional Information

Fails immediately on startup in v2.1.15, but works reliably after symlinking back to v2.1.14.