# Crash getting creation date from url / file manager (when file is \> 2gb)

**URL:** <https://forums.swift.org/t/crash-getting-creation-date-from-url-file-manager-when-file-is-2gb/73367>\
**Category:** Windows\
**Created:** [July 22, 2024, 9:38pm UTC](https://forums.swift.org/t/crash-getting-creation-date-from-url-file-manager-when-file-is-2gb/73367 "2024-07-22T21:38:40Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![mikewoodworth](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/mikewoodworth/32/25151_2.png) [@mikewoodworth](https://forums.swift.org/u/mikewoodworth)\
**Post date:** [July 22, 2024, 9:38pm UTC](https://forums.swift.org/t/crash-getting-creation-date-from-url-file-manager-when-file-is-2gb/73367/1 "2024-07-22T21:38:40Z")

</div>

Hello all,

I've spent all day beating my head against a crash in my windows build of this cross platform app. Here's the problem line:

```swift
 let values = try url.resourceValues(forKeys: [.nameKey, .creationDateKey, .contentModificationDateKey])

```

It's specifically related to the creationDate or modificationDate keys. Checking for either one leads to a crash in swiftCore.dll... but here's the kicker - it only happens for files larger than 2gb?

Is there any way to symbolize swiftCore and Foundation? I'm using sentry to capture these crash reports, but I dont have symbols for much in this backtrace:

```swift
Thread 11216 Crashed:
0 Foundation.dll 0x7fff5d06af41 <unknown>
1 swiftCore.dll 0x7fff6fd9b630 <unknown>
2 Foundation.dll 0x7fff5d05939c <unknown>
3 swiftCore.dll 0x7fff6fb73490 <unknown>
4 swiftCore.dll 0x7fff6fdb9c00 <unknown>
5 swiftCore.dll 0x7fff6fa473bb <unknown>
6 swiftCore.dll 0x7fff6fd9b630 <unknown>
7 swiftCore.dll 0x7fff6fb751ff <unknown>
8 swiftCore.dll 0x7fff6fc14004 <unknown>
9 swiftCore.dll 0x7fff6fb73506 <unknown>
10 swiftCore.dll 0x7fff6fb59ac9 <unknown>
11 Foundation.dll 0x7fff5d065ef0 <unknown>
12 swiftCore.dll 0x7fff6f87847c <unknown>
13 Foundation.dll 0x7fff5d5a1c80 <unknown>
14 Foundation.dll 0x7fff5d5a1c60 <unknown>
15 swiftCore.dll 0x7fff6f96bcdb <unknown>
16 Foundation.dll 0x7fff5d1ce595 <unknown>
17 swiftCore.dll 0x7fff6fb73003 <unknown>
18 Foundation.dll 0x7fff5d1ce62b <unknown>
19 swiftCore.dll 0x7fff6fbb5f10 <unknown>
20 swiftCore.dll 0x7fff6f96bbbb <unknown>
21 swiftCore.dll 0x7fff6fbfd0c5 <unknown>
22 Foundation.dll 0x7fff5d271496 <unknown>
23 swiftCore.dll 0x7fff6fa57cd0 <unknown>
24 swiftCore.dll 0x7fff6fbb5f10 <unknown>
25 Foundation.dll 0x7fff5d5a0e58 <unknown>
26 swiftCore.dll 0x7fff6fa57cd0 <unknown>
27 Foundation.dll 0x7fff5d1d19c6 <unknown>
28 ucrtbase.dll 0x7fffdd4d364a free_base
29 swiftCore.dll 0x7fff6fb751ff <unknown>
30 swiftCore.dll 0x7fff6fd9b630 <unknown>
31 swiftCore.dll 0x7fff6fc1a7a0 <unknown>
32 swiftCore.dll 0x7fff6fdb9c28 <unknown>
33 swiftCore.dll 0x7fff6fd9b630 <unknown>
34 swiftCore.dll 0x7fff6fc1a7a0 <unknown>
35 swiftCore.dll 0x7fff6fc29c00 <unknown>
36 Foundation.dll 0x7fff5d1c9120 <unknown>
37 swiftCore.dll 0x7fff6fd9b610 <unknown>
38 swiftCore.dll 0x7fff6fb73003 <unknown>
39 swiftCore.dll 0x7fff6fb74090 <unknown>
40 ntdll.dll 0x7fffe01c3baf RtlAddRefActivationContext
41 Foundation.dll 0x7fff5d171259 <unknown>
42 swiftCore.dll 0x7fff6fd9b610 <unknown>
43 Foundation.dll 0x7fff5d170209 <unknown>
44 swiftCore.dll 0x7fff6fb74090 <unknown>
45 swiftCore.dll 0x7fff6fc29b28 <unknown>
46 Foundation.dll 0x7fff5d1cae7d <unknown>
47 Foundation.dll 0x7fff5d2f88e4 <unknown>
48 swiftCore.dll 0x7fff6fbb5f10 <unknown>
49 Foundation.dll 0x7fff5d1c72a7 <unknown>
50 swiftCore.dll 0x7fff6fd9b630 <unknown>
51 swiftCore.dll 0x7fff6fb73ef0 <unknown>
52 swiftCore.dll 0x7fff6fbb5f10 <unknown>
53 Foundation.dll 0x7fff5d1ca396 <unknown>
54 Foundation.dll 0x7fff5d2648ab <unknown>
55 swiftCore.dll 0x7fff6fbb5f10 <unknown>
56 swiftCore.dll 0x7fff6fd9b610 <unknown>
57 swiftCore.dll 0x7fff6fbb5f70 <unknown>
58 swiftCore.dll 0x7fff6fb73ef0 <unknown>
59 Test.exe 0x7ff75a52a840 TestFileMetadataReader.getMetadataFromURL (TestFileMetadataReader.swift:18)

```

I confirmed this is file size related by taking a failing 3gb file and calling

```swift
fsutil file seteof <filename> 2147483647

```

and the file works... truncating a single byte larger fails.

The similar api in FileManager fails in the same way.

mike

---

<div class="post-metadata">

**Author:** ![gregcotten](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/gregcotten/32/13288_2.png) [@gregcotten](https://forums.swift.org/u/gregcotten)\
**Post date:** [August 10, 2025, 1:13am UTC](https://forums.swift.org/t/crash-getting-creation-date-from-url-file-manager-when-file-is-2gb/73367/2 "2025-08-10T01:13:17Z")

</div>

Oh man, just came here to see if anyone else had this problem… Did you ever figure anything out? @compnerd any ideas on how to get better debug information so we can make a PR and get this fixed?

---

<div class="post-metadata">

**Author:** ![gregcotten](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/gregcotten/32/13288_2.png) [@gregcotten](https://forums.swift.org/u/gregcotten)\
**Post date:** [August 10, 2025, 1:52am UTC](https://forums.swift.org/t/crash-getting-creation-date-from-url-file-manager-when-file-is-2gb/73367/3 "2025-08-10T01:52:56Z")

</div>

Just to be clear: Swift 6.1.2 - I haven’t had a chance to check `main` or `release/6.2` latest yet…

---

<div class="post-metadata">

**Author:** ![compnerd](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/compnerd/32/2165_2.png) [@compnerd](https://forums.swift.org/u/compnerd)\
**Post date:** [August 10, 2025, 3:36am UTC](https://forums.swift.org/t/crash-getting-creation-date-from-url-file-manager-when-file-is-2gb/73367/4 "2025-08-10T03:36:43Z")

</div>

I would say that you would need to build Foundation with debug info to get a better stack trace to figure out what is happening. This should be a little bit easier now with the new Foundation package. I imagine that you could do some hacks with `-nostdlibimport` to ensure that your local Foundation build is used.

---

<div class="post-metadata">

**Author:** ![gregcotten](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/gregcotten/32/13288_2.png) [@gregcotten](https://forums.swift.org/u/gregcotten)\
**Post date:** [August 10, 2025, 4:31am UTC](https://forums.swift.org/t/crash-getting-creation-date-from-url-file-manager-when-file-is-2gb/73367/5 "2025-08-10T04:31:22Z")

</div>

It’s actually a nightmarish problem.

Whenever `resourceValues`-based APIs touch a \>2GB file it’s an instant crash. For example, this crash happens when I try to enumerate all the files in a folder using `FileManager` enumerate APIs.

```swift
0x0000009e1511b3, Main.dll!
0x00000073753dc6, ntdll.dll!RtlWow64GetCurrentCpuArea
0x00000073754326, ntdll.dll!RtlWow64GetCurrentCpuArea
0x0000007384692e, ntdll.dll!KiUserExceptionDispatcher
0x00000086e38f64, Foundation.dll!type metadata accessor for (extension in Foundation):FoundationEssentials.FileManager.DirectoryEnumerator
0x00000086e33f36, Foundation.dll!(extension in Foundation):FoundationEssentials.FileManager.getRelationship(_: Swift.UnsafeMutablePointer<FoundationEssentials.FileManager.URLRelationship>, of: FoundationEssentials.FileManager.SearchPathDirectory, in: FoundationEssentials.FileManager.SearchPathDomainMask, toItemAt: FoundationEssentials.URL) throws -> ()
0x00000086f354ed, Foundation.dll!Foundation.NSURL.resolvingSymlinksInPath.getter : Swift.Optional<FoundationEssentials.URL>
0x00000086f36e80, Foundation.dll!type metadata accessor for Foundation.NSURL
0x00000086f327b2, Foundation.dll!Foundation.NSURL.__allocating_init() -> Foundation.NSURL
0x00000086f31e27, Foundation.dll!Foundation.NSURL.resourceValues(forKeys: Swift.Array<Foundation.URLResourceKey>) throws -> Swift.Dictionary<Foundation.URLResourceKey, Any>
0x00000086fa5108, Foundation.dll!(extension in Foundation):FoundationEssentials.URL.resourceValues(forKeys: Swift.Set<Foundation.URLResourceKey>) throws -> Foundation.URLResourceValues
0x0000009e2838f6, Main.dll!(extension in Foundation):FoundationEssentials.URL.resourceValues(forKeys: Swift.Set<Foundation.URLResourceKey>) throws -> Foundation.URLResourceValues
0x0000009e28365c, Main.dll!(extension in Foundation):FoundationEssentials.URL.resourceValues(forKeys: Swift.Set<Foundation.URLResourceKey>) throws -> Foundation.URLResourceValues
0x0000009e283335, Main.dll!(extension in Foundation):FoundationEssentials.URL.resourceValues(forKeys: Swift.Set<Foundation.URLResourceKey>) throws -> Foundation.URLResourceValues

```