Vitest-pool-workers: failed to remove cache objects

[ghostrider-05]

What versions & operating system are you using?

System:
OS: Windows 10 10.0.19045
CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
Memory: 4.02 GB / 15.81 GB
Binaries:
Node: 22.17.1 - C:\root\nvm\nodejs\node.EXE
Yarn: 1.22.4 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
npm: 10.9.2 - C:\root\nvm\nodejs\npm.CMD
npmPackages:
@cloudflare/vitest-pool-workers: ^0.8.68 => 0.8.68
@cloudflare/workers-types: ^4.20250829.0 => 4.20250829.0
wrangler: ^4.33.1 => 4.33.1

Please provide a link to a minimal reproduction

https://github.com/ghostrider-05/cf-vitest-debug-repro

Describe the Bug

When running vitest on my windows computer, I see many logs stating it failed to remove cache objects. These are repeated for many times making it impossible for me to see all test results sometimes. When running on GitHub actions (action runs on ubuntu-latest), I don't see these logs. Something to either disable or hide these logs would work for me.

Please provide any relevant error logs

vitest-pool-worker: Unable to remove temporary directory: Error: EBUSY: resource busy or locked, rmdir 'C:\Users\user\AppData\Local\Temp\miniflare-4cdfc3adc1efdd36e9c4005f21fc0e38\cache\miniflare-CacheObject'

Failed for Cache, D1, KV and R2 objects

[jamesopstad]

Hi @ghostrider-05. Please could you provide a minimal reproduction so we can look into it? Thanks.

[ghostrider-05]

Hi, I did not create a repro initially since I encountered it some time ago (could not the tell the release I first saw it to be honest) and only when I needed to adjust the terminal scrollback I found it annoying enough for this issue. I also could reproduce it with a template project with a single miniflare binding in the configuration, added it to the description of this issue

[pavolpr]

Same for me.

For repro use the guide from docs: Create a new Worker project

Run pnpm test

The test runs Ok, but the last line is:
vitest-pool-worker: Unable to remove temporary directory: Error: EBUSY: resource busy or locked, rmdir 'C:\Users\pavol\AppData\Local\Temp\miniflare-ae6057079a1e070b96012cca8226ae4d\cache\miniflare-CacheObject'

I am on Windows, which maybe the reason. I have other issues with worker testing, which may be connected: Support breakpoint debugging in vitest #10200

[vicb]

@jamesopstad are the repro steps provided in the last message enough to investigate?

[petebacondarwin]

This is a classic problem that only appears to happen on Windows.

We often find that it blocks us from deleting files (especially tmp ones) because it says the file is still locked by something. In our own CI tests we often just ignore such errors since the files will be removed when the CI runner is torn down.

I can see that this is not an option in Vitest where you are running it locally and the caches really do need to be removed.

I'll try to reproduce it on our Windows test machine. Hopefully we can put in place some more reliable file deletion that can wait until the file become free.