# Swift-format hangs without configuration

**URL:** <https://forums.swift.org/t/swift-format-hangs-without-configuration/79999>\
**Category:** Swift Format\
**Created:** [May 20, 2025, 2:45am UTC](https://forums.swift.org/t/swift-format-hangs-without-configuration/79999 "2025-05-20T02:45:51Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bbrk24](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/bbrk24/32/27370_2.png) [@bbrk24](https://forums.swift.org/u/bbrk24)\
**Post date:** [May 20, 2025, 2:45am UTC](https://forums.swift.org/t/swift-format-hangs-without-configuration/79999/1 "2025-05-20T02:45:51Z")

</div>

Basically the title. If I run `swift format -ir Sources/`, it maxes out one CPU core and does nothing. I let it sit like this for a full two minutes. Then, I killed it and added `--configuration "{}"` and it finished in under a second.

This has to be a bug, right? Has anyone else encountered this before?

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<div class="post-metadata">

**Author:** ![ahoppen](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/ahoppen/32/36046_2.png) [@ahoppen](https://forums.swift.org/u/ahoppen)\
**Post date:** [May 20, 2025, 8:42am UTC](https://forums.swift.org/t/swift-format-hangs-without-configuration/79999/2 "2025-05-20T08:42:08Z")

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Which version of Swift are you using? This sounds like an issue we had in Swift 6.0 but it should be fixed in 6.1, maybe even 6.0.2 or 6.0.3, I don’t quite remember.

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<div class="post-metadata">

**Author:** ![johannesweiss](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/johannesweiss/32/38183_2.png) [@johannesweiss](https://forums.swift.org/u/johannesweiss)\
**Post date:** [May 20, 2025, 11:13am UTC](https://forums.swift.org/t/swift-format-hangs-without-configuration/79999/3 "2025-05-20T11:13:53Z")

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I just ran it in a docker container with 6.0.3 (Ubuntu Noble) and it appears to have worked:

```swift
root@e805d7528610:/tmp# git clone https://github.com/apple/swift-nio
Cloning into 'swift-nio'...
remote: Enumerating objects: 27372, done.
remote: Counting objects: 100% (113/113), done.
remote: Compressing objects: 100% (85/85), done.
remote: Total 27372 (delta 64), reused 28 (delta 28), pack-reused 27259 (from 3)
Receiving objects: 100% (27372/27372), 10.96 MiB | 16.01 MiB/s, done.
Resolving deltas: 100% (21365/21365), done.
root@e805d7528610:/tmp# cd swift-nio/
root@e805d7528610:/tmp/swift-nio# swift format -ir Sources/
root@e805d7528610:/tmp/swift-nio# swift format -v
main
root@e805d7528610:/tmp/swift-nio# swift -version
Swift version 6.0.3 (swift-6.0.3-RELEASE)
Target: x86_64-unknown-linux-gnu

```

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<div class="post-metadata">

**Author:** ![bbrk24](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/bbrk24/32/27370_2.png) [@bbrk24](https://forums.swift.org/u/bbrk24)\
**Post date:** [May 20, 2025, 12:42pm UTC](https://forums.swift.org/t/swift-format-hangs-without-configuration/79999/4 "2025-05-20T12:42:10Z")

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Yeah, I'm on 6.0.2. Good to know it's been fixed.