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Failed test: GC/API/GC/GetGeneration/GetGeneration.dll #131542
Description
Build Information
Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1531411
Build error leg or test failing: GC/API/GC/GetGeneration/GetGeneration.dll
- Massive failures in many configs
14:46:12.949 Running test: GC/API/GC/GetGeneration/GetGeneration.dll
0 0
ObjectTest Failed!
0 0
arrayTest Failed!
failTest Passed!
Test for GetGeneration() FAILED!
Xunit.Sdk.EqualException: Assert.Equal() Failure: Values differ
Expected: 100
Actual: 1
at Xunit.Assert.Equal[T](T expected, T actual, IEqualityComparer`1 comparer) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/EqualityAsserts.cs:line 102
at Xunit.Assert.Equal[T](T expected, T actual) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/EqualityAsserts.cs:line 36
at Program.<<Main>$>g__TestExecutor28|0_29(StreamWriter tempLogSw, StreamWriter statsCsvSw, <>c__DisplayClass0_0&)
Error Message
Fill the error message using step by step known issues guidance.
{
"ErrorMessage": "Failed test: GC/API/GC/GetGeneration/GetGeneration.dll",
"BuildRetry": false,
"ExcludeConsoleLog": false
}Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1531411
Error message validated: [Failed test: GC/API/GC/GetGeneration/GetGeneration.dll]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 7/29/2026 5:40:38 PM UTC
Report
| Build | Repository | Test | Pull Request |
|---|---|---|---|
| 1538649 | dotnet/runtime | GC/API/GC/GetGeneration/GetGeneration.dll | #131754 |
| 1537295 | dotnet/runtime | GC/API/GC/GetGeneration/GetGeneration.dll | |
| 1536715 | dotnet/runtime | GC/API/GC/GetGeneration/GetGeneration.dll | |
| 1534710 | dotnet/runtime | GC/API/GC/GetGeneration/GetGeneration.dll | |
| 1533324 | dotnet/runtime | GC/API/GC/GetGeneration/GetGeneration.dll | |
| 1533254 | dotnet/runtime | GC/API/GC/GetGeneration/GetGeneration.dll | #131590 |
| 1532391 | dotnet/runtime | GC/API/GC/GetGeneration/GetGeneration.dll | #131027 |
| 1531411 | dotnet/runtime | GC/API/GC/GetGeneration/GetGeneration.dll |
Summary
| 24-Hour Hit Count | 7-Day Hit Count | 1-Month Count |
|---|---|---|
| 2 | 8 | 8 |
Metadata
Metadata
Type
Projects
- Status
Activity
dotnet-policy-service commentedon Jul 29, 2026
Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.
JulieLeeMSFT commentedon Jul 29, 2026
GC tests are failing in runtime-interpreter. cc @davidwrighton, if it's related to your recent change.
dotnet-policy-service commentedon Jul 29, 2026
Tagging subscribers to this area: @anicka-net, @dotnet/gc
See info in area-owners.md if you want to be subscribed.
janvorli commentedon Jul 29, 2026
This test has been always failing on my local machine. I am actually surprised it wasn't failing in the CI bewfore.
janvorli commentedon Jul 30, 2026
The test expects that a generation of a freshly created object will grow after GC.Collect() call and with interpreter it doesn't. I have verified that the local holding the object is reported to GC. It is reported as pinned, so I guess that might cause a demotion. I am looking into it to make sure it is not a bug.
janvorli commentedon Jul 31, 2026
I've debugged it. It is an interpreter incompatibility. The thing is that when interpreted code reports the local that we check the generation for, the GC info marks that local intentionally as pinned. GC then due to this decides to demote the object back to generation 0. But the test expects that after a GC.Collect, it would get higher generation.
1 remaining item
dotnet-policy-service commentedon Aug 3, 2026
Tagging subscribers to this area: @JulieLeeMSFT, @BrzVlad, @janvorli
See info in area-owners.md if you want to be subscribed.
janvorli commentedon Aug 3, 2026
Right.
JulieLeeMSFT commentedon Aug 4, 2026
@BrzVlad, @janvorli, this test is failing heavily. I see that the fix is planned for .NET 12. Meanwhile, can you please disable the test?
BrzVlad commentedon Aug 4, 2026
@copilot Disable this test via
InterpreterIncompatibleDisable GetGeneration test under interpreter (InterpreterIncompatible) (