ERROR Failed to initialize wrangler bindings proxy spawn EBADF

[justin-schroeder]

I really, truly, wish I could reproduce this for you, but I figured it would at least help to drop this issue here as a marker. This issue seems to pop up entirely randomly.

Here is the stack trace:

ERROR  Failed to initialize wrangler bindings proxy spawn EBADF

    at ChildProcess.spawn (node:internal/child_process:421:11)
    at Object.spawn (node:child_process:761:9)
    at Runtime.updateConfig (node_modules/.pnpm/miniflare@3.20250310.0/node_modules/miniflare/dist/src/index.js:10115:57)
    at async #assembleAndUpdateConfig (node_modules/.pnpm/miniflare@3.20250310.0/node_modules/miniflare/dist/src/index.js:15339:30)
    at async Mutex.runWith (node_modules/.pnpm/miniflare@3.20250310.0/node_modules/miniflare/dist/src/index.js:1725:16)
    at async #waitForReady (node_modules/.pnpm/miniflare@3.20250310.0/node_modules/miniflare/dist/src/index.js:15403:5)
    at async Miniflare2._getProxyClient (node_modules/.pnpm/miniflare@3.20250310.0/node_modules/miniflare/dist/src/index.js:15527:5)
    at async Miniflare2.getBindings (node_modules/.pnpm/miniflare@3.20250310.0/node_modules/miniflare/dist/src/index.js:15546:25)
    at async getPlatformProxy (node_modules/.pnpm/wrangler@3.114.1_@cloudflare+workers-types@4.20250311.0/node_modules/wrangler/wrangler-dist/cli.js:158007:20)
    at async _getPlatformProxy (.nuxt/dev/index.mjs:5326:17)

This may be a miniflare issue too, although it doesnt look like that repo gets a lot of love. The specific spawn that is being attempted is workerd with the following arguments:

[
  'serve',
  '--binary',
  '--experimental',
  '--socket-addr=entry=127.0.0.1:0',
  '--external-addr=loopback=127.0.0.1:64989',
  '--control-fd=3',
  '-'
]

I cannot reliably get this to go away once it starts. I pnpm install, delete node modules, nuxi cleanup — none of that works, but then all of a sudden it does start working. I have no idea to be honest.

Environment

• Operating System: Darwin
• Node Version: v20.11.0
• Nuxt Version: 3.16.0
• CLI Version: 3.22.5
• Nitro Version: 2.11.6
• Package Manager: pnpm@8.15.4
• Builder: -
• User Config: app, compatibilityDate, modules, runtimeConfig, turnstile, css, postcss, imports, devtools, nitro
• Runtime Modules: nitro-cloudflare-dev@0.2.2, @nuxt/icon@1.10.3, @nuxtjs/turnstile@0.9.15, @pinia/nuxt@0.9.0
• Build Modules: -

[justin-schroeder]

Update: for folks struggling with this, it happens when sub-directories in the .wrangler directory fill up with a lot of files - this can be especially true for kv values since each creates its own file on the filesystem. MacOS has a limit on how many open handles it can take at a time and eventually it runs out and you'll get this error. The only solution, afaik, is to purge those kv files occasionally.