CollectionsMarshal.AsSpan assertion failure in System.Text.Json tests

[jkotas]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=524311
Build error leg or test failing: System.Text.Json.Tests.WorkItemExecution
Pull request: #96870

Error Message

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

{
  "ErrorMessage": "Implementation depends on List<T> always using a T[] and not U[] where U : T.",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=524311
Error message validated: Implementation depends on List<T> always using a T[] and not U[] where U : T.
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 1/12/2024 1:31:48 AM UTC

Report

Build	Definition	Test	Pull Request
524882	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#95583
525560	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96609
526100	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96880
525785	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96913
525988	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96928
525991	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#89472
525957	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96927
525923	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96926
525892	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96201
525842	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96924
525765	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96921
525686	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96916
525621	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
525570	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96880
525477	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96805
525444	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96867
525362	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96880
525344	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96741
525094	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96894
525249	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96896
525236	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96445
525231	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96890
525196	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96214
525140	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96676
525086	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96893
525001	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96741
524968	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96892
524959	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96558
524862	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96889
524798	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
524790	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#95583
524621	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96860
524464	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96805
524458	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96867
524255	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96829
524448	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96858
524210	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
524311	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96870
524291	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96867
524193	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96858
524168	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96805
524110	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96795
524101	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96699

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	43	43

Tagging subscribers to this area: @dotnet/area-infrastructure-libraries
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=524311
Build error leg or test failing: System.Text.Json.Tests.WorkItemExecution
Pull request: #96870

Error Message

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

{
  "ErrorMessage": "Implementation depends on List<T> always using a T[] and not U[] where U : T.",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Author:	jkotas
Assignees:	-
Labels:	area-Infrastructure-libraries, blocking-clean-ci, Known Build Error
Milestone:	-

[jkotas]

cc @stephentoub

[stephentoub]

bleh, the change is flawed. will revert and rethink.

[jkotas]

bleh, the change is flawed. will revert and rethink.

Where is the flaw?

[stephentoub]

Hmm, I was thinking for a moment it would still need to check and actually throw, but with lists being invariant, it shouldn't be possible to specify a T and pass in a List of a derived type. So now I don't know what's going on and will need to look at what the failing test is doing, but I'm away from my computer through the weekend.

Tagging subscribers to this area: @dotnet/area-system-text-json, @gregsdennis
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=524311
Build error leg or test failing: System.Text.Json.Tests.WorkItemExecution
Pull request: #96870

Error Message

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

{
  "ErrorMessage": "Implementation depends on List<T> always using a T[] and not U[] where U : T.",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=524311
Error message validated: Implementation depends on List<T> always using a T[] and not U[] where U : T.
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 1/12/2024 1:31:48 AM UTC

Report

Build	Definition	Test	Pull Request
524464	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96805
524458	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96867
524255	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96829
524448	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96858
524210	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
524311	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96870
524291	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96867
524193	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96858
524168	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96805
524110	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96795
524101	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#96699

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
11	11	11

Author:	jkotas
Assignees:	-
Labels:	area-System.Text.Json, blocking-clean-ci, untriaged, in-pr, Known Build Error
Milestone:	-