browser-wasm linux LibraryTests build failure - NETSDK1022: Duplicate 'Content' items

[MihaZupan]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1254965&view=logs&j=d4e38924-13a0-58bd-9074-6a4810543e7c
Build error leg or test failing: Build / browser-wasm linux Release LibraryTests / Build product
Pull request: #123223

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "error NETSDK1022: Duplicate 'Content' items were included. The .NET SDK includes 'Content' items from your project directory by default.",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1254965
Error message validated: [error NETSDK1022: Duplicate 'Content' items were included. The .NET SDK includes 'Content' items from your project directory by default.]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 1/16/2026 12:11:28 AM UTC

Report

Build	Definition	Step Name	Console log	Pull Request
1258213	dotnet/runtime	Build product	Log	#123346
1258305	dotnet/runtime	Build product	Log	#123348
1258299	dotnet/runtime	Build product	Log	#123319
1258294	dotnet/runtime	Build product	Log	#123342
1258249	dotnet/runtime	Build product	Log	#123145
1257986	dotnet/runtime	Build product	Log	#123327
1258239	dotnet/runtime	Build product	Log	#123090
1258185	dotnet/runtime	Build product	Log	#123331
1258153	dotnet/runtime	Build product	Log	#122093
1258060	dotnet/runtime	Build product	Log	#123326
1258042	dotnet/runtime	Build product	Log	#123332
1257885	dotnet/runtime	Build product	Log	#120688
1257878	dotnet/runtime	Build product	Log
1257848	dotnet/runtime	Build product	Log	#106374
1257837	dotnet/runtime	Build product	Log	#123248
1257772	dotnet/runtime	Build product	Log	#123338
1257708	dotnet/runtime	Build product	Log	#123248
1257698	dotnet/runtime	Build product	Log	#122371
1257674	dotnet/runtime	Build product	Log	#105403
1257637	dotnet/runtime	Build product	Log	#123239
1257626	dotnet/runtime	Build product	Log	#123304
1257620	dotnet/runtime	Build product	Log	#105403
1257602	dotnet/runtime	Build product	Log
1257561	dotnet/runtime	Build product	Log	#123326
1257558	dotnet/runtime	Build product	Log	#123332
1257555	dotnet/runtime	Build product	Log	#123331
1257548	dotnet/runtime	Build product	Log	#121412
1257545	dotnet/runtime	Build product	Log	#123304
1257541	dotnet/runtime	Build product	Log	#123327
1257538	dotnet/runtime	Build product	Log	#123330
1257534	dotnet/runtime	Build product	Log	#123329
1257523	dotnet/runtime	Build product	Log	#123328
1257499	dotnet/runtime	Build product	Log	#123315
1257480	dotnet/runtime	Build product	Log	#123319
1257476	dotnet/runtime	Build product	Log	#105403
1257408	dotnet/runtime	Build product	Log	#121412
1257322	dotnet/runtime	Build product	Log
1257291	dotnet/runtime	Build product	Log	#105403
1257234	dotnet/runtime	Build product	Log	#121412
1257267	dotnet/runtime	Build product	Log	#123299
1257213	dotnet/runtime	Build product	Log	#123320
1257206	dotnet/runtime	Build product	Log	#123234
1257196	dotnet/runtime	Build product	Log	#123288
1257174	dotnet/runtime	Build product	Log	#118932
1257171	dotnet/runtime	Build product	Log	#123306
1257157	dotnet/runtime	Build product	Log	#123295
1257149	dotnet/runtime	Build product	Log	#123313
1257129	dotnet/runtime	Build product	Log	#123234
1257107	dotnet/runtime	Build product	Log	#122056
1257092	dotnet/runtime	Build product	Log
1257033	dotnet/runtime	Build product	Log	#122722
1256995	dotnet/runtime	Build product	Log	#123295
1256992	dotnet/runtime	Build product	Log	#123296
1256989	dotnet/runtime	Build product	Log	#123294
1256904	dotnet/runtime	Build product	Log	#123304
1256885	dotnet/runtime	Build product	Log	#123306
2881471	dotnet-runtime	Build product	Log
1256815	dotnet/runtime	Build product	Log
1256788	dotnet/runtime	Build product	Log	#119432
1256766	dotnet/runtime	Build product	Log	#123288
1256742	dotnet/runtime	Build product	Log	#123248
1256720	dotnet/runtime	Build product	Log	#123299
1256691	dotnet/runtime	Build product	Log	#123239
1256662	dotnet/runtime	Build product	Log	#123234
1256631	dotnet/runtime	Build product	Log	#123292
1256616	dotnet/runtime	Build product	Log	#123296
1256607	dotnet/runtime	Build product	Log	#123294
1256604	dotnet/runtime	Build product	Log	#123295
1256553	dotnet/runtime	Build product	Log	#123045
1256526	dotnet/runtime	Build product	Log	#123040
1256513	dotnet/runtime	Build product	Log	#121412
1256482	dotnet/runtime	Build product	Log	#122430
1256406	dotnet/runtime	Build product	Log	#120306
1256315	dotnet/runtime	Build product	Log	#122371
1256307	dotnet/runtime	Build product	Log
1256234	dotnet/runtime	Build product	Log	#123048
1256212	dotnet/runtime	Build product	Log	#123090
1256190	dotnet/runtime	Build product	Log	#123274
1255963	dotnet/runtime	Build product	Log	#123109
1255953	dotnet/runtime	Build product	Log	#123033
1255891	dotnet/runtime	Build product	Log	#123260
1255850	dotnet/runtime	Build product	Log	#123258
1255828	dotnet/runtime	Build product	Log	#119575
1255803	dotnet/runtime	Build product	Log	#123033
1255698	dotnet/runtime	Build product	Log	#123255
1255586	dotnet/runtime	Build product	Log	#123211
1255577	dotnet/runtime	Build product	Log
1255455	dotnet/runtime	Build product	Log	#123169
1255394	dotnet/runtime	Build product	Log	#123247
1255340	dotnet/runtime	Build product	Log	#123151
1255322	dotnet/runtime	Build product	Log	#123234
1255196	dotnet/runtime	Build product	Log	#123239
1255049	dotnet/runtime	Build product	Log	#120306
1255012	dotnet/runtime	Build product	Log	#123230
1255002	dotnet/runtime	Build product	Log	#123229
1254965	dotnet/runtime	Build product	Log	#123223

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	96

[dotnet-policy-service]

Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara
See info in area-owners.md if you want to be subscribed.

[pavelsavara]

it seems to be about Microsoft.Extensions.Configuration.Functional.Tests.csproj::TargetFramework=net11.0

[lewing]

@jeffhandley @pedrobsaila any chance this is related to #111101 ?

[pedrobsaila]

The change in #111101 enables watching files when the latest are supplied with a relative path. It does not copy/move around files directly. I checked the class CheckForDuplicateItems that produce the error, it does not use PhysicalFilesWatcher or the ChangeToken.OnChange method nor the entire sdk/msbuild/Microsoft.Extensions.Configuration.Xml projects. Either there is some hidden code that moves around files based on change event that was not working before and now it is working causing the duplicates, either the change is unrelated.

Also the EnableDefaultContentItems values and the code around CheckForDuplicateItems did not change recently. I don't think it is an sdk issue.

[pavelsavara]

The duplicated file is testFileToReload.json which was added in #111101
But it didn't trigger wasm CI build and so that was silent failure.

It's added to _ContentIncludedByDefault and Content, in both cases twice.

[pavelsavara]

It seems it can also get added when EnableDefaultContentItems true and they are true for browser.

I maybe because static web assets ?

https://github.com/dotnet/sdk/blob/edfc6171198a333e2dd35964c917c21091659ef7/src/StaticWebAssetsSdk/Targets/Sdk.StaticWebAssets.CurrentVersion.targets#L13

https://github.com/dotnet/sdk/blob/93a9a5a91fa1635a4a38b3ba6fce4262bbd89c6a/src/StaticWebAssetsSdk/Sdk/Sdk.StaticWebAssets.StaticAssets.ProjectSystem.props#L37

I'm just guessing.

Workaround attempt here #123335