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claude-code - 💡(How to fix) Fix [BUG] Bun standalone crashes with ENOEXEC posix_spawn reg.exe on WSL2 [2 comments, 3 participants]

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anthropics/claude-code#52351•Fetched 2026-04-24 06:09:29
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johnhollidayjohnholliday
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Error Message

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

Error Messages/Logs

ENOEXEC: unknown error, posix_spawn '/mnt/c/Windows/System32/reg.exe'

Code Example

❯ 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)
RAW_BUFFERClick to expand / collapse

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

extent analysis

TL;DR

The issue is likely due to an incompatibility between the updated Claude Code version and the WSL environment, causing an ENOEXEC error when trying to spawn a process.

Guidance

  • The error message indicates a problem with posix_spawn and an unknown error, suggesting an issue with the execution of the reg.exe file.
  • The fact that this worked in a previous version (2.1.117) and not in the current version (2.1.118) suggests a regression bug.
  • Try downgrading to version 2.1.117 to verify if the issue is specific to the latest version.
  • Investigate potential differences in system calls or dependencies between the two versions that could be causing the incompatibility.

Example

No code snippet is provided as the issue seems to be related to a specific version and environment.

Notes

The issue might be specific to the WSL environment on Windows, and testing on a native Linux system could help determine if the problem is environment-specific.

Recommendation

Apply workaround: Downgrade to version 2.1.117 until the issue is resolved in a future version, as it is confirmed to work in that version.

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