[BUG] Bun standalone crashes with ENOEXEC posix_spawn reg.exe on WSL2

[johnholliday]

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?

After updating Claude Code to version 2.1.118, Claude immediately crashes with ENOEXEC error.

What Should Happen?

Claude should launch normally.

Error Messages/Logs

❯ claude
662 |     var file = this.spawnfile = options.file, spawnargs;
663 |     if (options.args === @undefined)
664 |       spawnargs = this.spawnargs = [];
665 |     else
666 |       validateArray(options.args, "options.args"), spawnargs = this.spawnargs = options.args;
667 |       if (this.#handle = Bun.spawn({
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 ^
ENOEXEC: unknown error, posix_spawn '/mnt/c/Windows/System32/reg.exe'
    path: "/mnt/c/Windows/System32/reg.exe",
 syscall: "posix_spawn",
   errno: -8,
    code: "ENOEXEC"

      at spawn (node:child_process:667:35)
      at spawn (node:child_process:14:39)
      at execFile (node:child_process:59:20)
      at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:188:1452)
      at new Promise (1:11)
      at gl6 (/$bunfs/root/src/entrypoints/cli.js:188:1422)
      at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:188:1602)
      at $W$ (/$bunfs/root/src/entrypoints/cli.js:188:1822)
      at Ql6 (/$bunfs/root/src/entrypoints/cli.js:188:1861)

Bun v1.3.13 (Linux x64 baseline)

Steps to Reproduce

1. Install v 2.1.118
2. Run 'Claude'

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.117

Claude Code Version

2.1.118

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

No response

[github-actions]

Found 3 possible duplicate issues:

1. [BUG] Hard crash at startup on WSL2 when binfmt_misc has no WSLInterop entry (ENOEXEC spawning reg.exe) #52318
2. [BUG] claude crashes on WSL with ENOEXEC when reading Windows-side managed settings (wslInheritsWindowsSettings)  #52350
3. [BUG] Bun panic: invalid enum value on Windows win11_dt + WSL reg.exe ENOEXEC error #52230

This issue will be automatically closed as a duplicate in 3 days.

• If your issue is a duplicate, please close it and 👍 the existing issue instead
• To prevent auto-closure, add a comment or 👎 this comment

🤖 Generated with Claude Code

[yjfvictor]

Exactly. The same error.

OS: Windows 11 Version 25H2 OS Build 26200.8246 (WSL: Ubuntu 24.04.4 LTS)
Platform: VS Code for Windows 1.117.0 (WSL mode)

I called out the Claude Code extenion in VS Code (WSL mode), and I got the following error:

662 |     var file = this.spawnfile = options.file, spawnargs;
663 |     if (options.args === @undefined)
664 |       spawnargs = this.spawnargs = [];
665 |     else
666 |       validateArray(options.args, "options.args"), spawnargs = this.spawnargs = options.args;
667 |       if (this.#handle = Bun.spawn({
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 ^
ENOEXEC: unknown error, posix_spawn '/mnt/c/Windows/System32/reg.exe'
    path: "/mnt/c/Windows/System32/reg.exe",
 syscall: "posix_spawn",
   errno: -8,
    code: "ENOEXEC"

      at spawn (node:child_process:667:35)
      at spawn (node:child_process:14:39)
      at execFile (node:child_process:59:20)
      at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:188:1452)
      at new Promise (1:11)
      at gl6 (/$bunfs/root/src/entrypoints/cli.js:188:1422)
      at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:188:1602)
      at $W$ (/$bunfs/root/src/entrypoints/cli.js:188:1822)
      at Ql6 (/$bunfs/root/src/entrypoints/cli.js:188:1861)

Bun v1.3.13 (Linux x64 baseline)

This error message is generated by ~/.vscode-server/extensions/anthropic.claude-code-2.1.118-linux-x64/resources/native-binary/claude.

[github-actions]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.