[BUG] claude crashes with Bun segfault on Windows 10 + Intel 13th Gen (i7-13700H)

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

• OS: Microsoft Windows 10 Pro for Workstations
• CPU: 13th Gen Intel Core i7-13700H (hybrid P-core/E-core architecture)
• RAM: 34GB
• Claude Code version: 2.1.114
• Bun version (bundled): 1.3.13 (743d2a40) Windows x64 (baseline)
• Node version: (run node --version and add here)
• npm version: (run npm --version and add here)

Description

Claude Code crashes immediately on every launch with a Bun segmentation fault.
The crash occurs before any UI renders, making Claude Code completely unusable.
This affects both the terminal CLI and the VS Code extension.

Error Output

============================================================
Bun v1.3.13 (743d2a40) Windows x64 (baseline)
Windows v.win10_cu
CPU: sse42 avx avx2
Elapsed: ~1800ms | User: ~300ms | Sys: ~300ms
RSS: ~0.40GB | Peak: ~0.40GB | Commit: ~0.51GB

panic(thread XXXXX): Segmentation fault at address 0xCC
panic: Segmentation fault at address 0xC8
panicked during a panic. Aborting.

Impact

• claude CLI crashes immediately
• VS Code extension shows "Error: Claude Code process exited with code 3"
• OAuth authentication fails because the localhost callback server dies with the process
• Completely unusable on this hardware/OS combination

Steps to Reproduce

1. Install Claude Code: npm install -g @anthropic-ai/claude-code
2. Run: claude
3. Observe immediate segfault

What Should Happen?

Claude Code crashes immediately on every launch with a Bun segmentation fault.
The crash occurs before any UI renders, making Claude Code completely unusable.
This affects both the terminal CLI and the VS Code extension.

Error Messages/Logs

Bun v1.3.13 (743d2a40) Windows x64 (baseline)
Windows v.win10_cu
CPU: sse42 avx avx2
Elapsed: ~1800ms | User: ~300ms | Sys: ~300ms
RSS: ~0.40GB | Peak: ~0.40GB | Commit: ~0.51GB

panic(thread XXXXX): Segmentation fault at address 0xCC
panic: Segmentation fault at address 0xC8
panicked during a panic. Aborting.

Steps to Reproduce

1. Install Claude Code: npm install -g @anthropic-ai/claude-code
2. Run: claude
3. Observe immediate segfault

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.116

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

What I've Tried

• Fresh uninstall/reinstall of Claude Code
• Running as admin and as normal user
• Removing all Claude and Bun related files and reinstalling
• Installing/uninstalling system Bun separately
• VS Code extension (same crash)

Root Cause (suspected)

Bun 1.3.13 appears to have a known segfault issue on Windows 10 with
Intel 12th/13th Gen hybrid CPU architectures (P-core + E-core).
Windows 10 lacks Intel Thread Director support (available in Windows 11),
which properly handles P/E-core thread scheduling for Bun.

Request

Please Bundle a Bun version that is stable on Windows 10 + Intel 12th/13th gen.