[linux-bionic] TimeZoneInfoTests.IsIanaIdTest fails - GMT has wrong IANA Id indicator

[ViveliDuCh]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1597620
Build error leg or test failing: net8.0-linux-Release-arm64-Mono_Release_LinuxBionic / System.Tests.TimeZoneInfoTests.IsIanaIdTest
Pull request: #133957 (release/8.0-staging -> release/8.0 merge; not introduced by this PR)

Console log: https://helixr1107v0xdeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-heads-release-80-staging-73ec7564f9d441f6ae/System.Runtime.Tests/1/console.b3f55a44.log?helixlogtype=result

`GMT` has wrong IANA Id indicator
Expected: True
Actual:   False

Bionic's ICU/tzdata build reports GMT's IANA-id status differently from glibc-based Linux, so TimeZoneInfo.HasIanaId disagrees with the test's expectation for that specific zone name on the linux-bionic (Android libc) target.

Note: the same Helix job also reported generic WorkItemExecution crash failures for five unrelated assemblies (System.Buffers.Tests, System.Net.Ping.Functional.Tests, System.Private.Xml.Tests, System.Resources.ResourceManager.Tests, System.Runtime.CompilerServices.Unsafe.Tests) with no further detail.

Error Message

{
  "ErrorMessage": "`GMT` has wrong IANA Id indicator",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1597620
Error message validated: [IsIanaIdTest]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/15/2026 10:44:44 PM UTC

Report

Build	Repository	Test	Pull Request
1618546	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134979
1618998	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134978
1618965	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134960
1618927	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134668
1618922	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134875
1618899	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134993
1618894	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134611
1618883	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134992
1618873	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134494
1618870	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134991
1618806	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134989
1618735	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#132955
1618713	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#133918
1618704	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134987
1618649	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134910
1618639	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#131826
1618623	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134985
1618629	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134880
1618606	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134984
1618593	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134981
1618584	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134983
1618581	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134982
1618574	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134966
1618562	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134549
1618519	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134881
1618497	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns
1618434	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#132584
1618440	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#132788
1618404	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134956
1618412	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134873
1618376	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134970
1618381	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134971
1618399	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134974
1618371	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134969
1618387	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134973
1618356	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134729
1618332	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134967
1618319	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134871
1618304	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134078
1618287	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134964
1618291	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134965
1618260	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134466
1618241	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134962
1617613	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#134843
1616588	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134857
1615872	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#134843
1613256	dotnet/runtime	System.Runtime.IOS.Tests.WorkItemExecution	#133575
1609086	dotnet/runtime	WasmTestOnChrome-ST-System.Runtime.Tests.WorkItemExecution	#134404
1609102	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1606683	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1603356	dotnet/runtime	WasmTestOnChrome-ST-System.Runtime.Tests.WorkItemExecution	#134020
1601369	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1599809	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1598686	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1597620	dotnet/runtime	System.Runtime.Tests.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
44	47	55

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1597620
Error message validated: [GMT has wrong IANA Id indicator]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 10/1/2026 5:58:04 AM UTC

Report

Build	Repository	Test	Pull Request
1618546	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134979
1618998	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134978
1618965	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134960
1618927	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134668
1618922	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134875
1618899	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134993
1618894	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134611
1618883	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134992
1618873	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134494
1618870	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134991
1618806	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134989
1618735	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#132955
1618713	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#133918
1618704	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134987
1618649	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134910
1618639	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#131826
1618623	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134985
1618629	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134880
1618606	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134984
1618593	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134981
1618584	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134983
1618581	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134982
1618574	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134966
1618562	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134549
1618519	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134881
1618497	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns
1618434	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#132584
1618440	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#132788
1618404	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134956
1618412	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134873
1618376	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134970
1618381	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134971
1618399	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134974
1618371	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134969
1618387	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134973
1618356	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134729
1618332	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134967
1618319	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134871
1618304	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134078
1618287	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134964
1618291	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134965
1618260	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134466
1618241	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134962
1617613	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#134843
1616588	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134857
1615872	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#134843
1613256	dotnet/runtime	System.Runtime.IOS.Tests.WorkItemExecution	#133575
1609086	dotnet/runtime	WasmTestOnChrome-ST-System.Runtime.Tests.WorkItemExecution	#134404
1609102	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1606683	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1603356	dotnet/runtime	WasmTestOnChrome-ST-System.Runtime.Tests.WorkItemExecution	#134020
1601369	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1599809	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1598686	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1597620	dotnet/runtime	System.Runtime.Tests.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
44	47	55

Report

Build	Repository	Test	Pull Request
1618546	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134979
1618998	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134978
1618965	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134960
1618927	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134668
1618922	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134875
1618899	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134993
1618894	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134611
1618883	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134992
1618873	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134494
1618870	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134991
1618806	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134989
1618735	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#132955
1618713	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#133918
1618704	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134987
1618649	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134910
1618639	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#131826
1618623	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134985
1618629	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134880
1618606	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134984
1618593	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134981
1618584	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134983
1618581	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134982
1618574	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134966
1618562	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134549
1618519	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134881
1618497	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns
1618434	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#132584
1618440	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#132788
1618404	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134956
1618412	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134873
1618376	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134970
1618381	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134971
1618399	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134974
1618371	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134969
1618387	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134973
1618356	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134729
1618332	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134967
1618319	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134871
1618304	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134078
1618287	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134964
1618291	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134965
1618260	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134466
1618241	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134962
1617613	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#134843
1616588	dotnet/runtime	System.Tests.DoubleTests.Parse_CustomSigns	#134857
1615872	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#134843
1613256	dotnet/runtime	System.Runtime.IOS.Tests.WorkItemExecution	#133575
1609086	dotnet/runtime	WasmTestOnChrome-ST-System.Runtime.Tests.WorkItemExecution	#134404
1609102	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1606683	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1603356	dotnet/runtime	WasmTestOnChrome-ST-System.Runtime.Tests.WorkItemExecution	#134020
1601369	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1599809	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1598686	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1597620	dotnet/runtime	System.Runtime.Tests.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	43	55

[dotnet-policy-service]

Tagging subscribers to 'arch-android': @vitek-karas, @simonrozsival, @steveisok, @akoeplinger
See info in area-owners.md if you want to be subscribed.

[dotnet-policy-service]

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

[steveisok]

We should really stop running this on .net 8.

[matouskozak]

I've removed the "ErrorPattern": "IsIanaIdTest", as that is matching any console output which contains this string, e.g. https://helixr1107v0xdcypoyl9e7f.blob.core.windows.net/results-d187536a3f37497395/System.Runtime.Tests/1/console.c264c1bb.log?helixlogtype=result&skoid=8eda00af-b5ec-4be9-b69b-0919a2338892&sktid=72f988bf-86f1-41af-91ab-2d7cd011db47&skt=2026-10-01T05%3A56%3A15Z&ske=2026-10-01T06%3A56%3A15Z&sks=b&skv=2026-02-06&sv=2026-02-06&se=2026-10-01T06%3A56%3A15Z&sr=b&sp=rl&sig=xpcB9bBp%2FR131DKlL5GYSxCOUlr%2FqS9hH8uTJTBKCQ0%3D

which contains completely unrelated failure.

System.Tests.DoubleTests.Parse_CustomSigns(value: "??Infinity", positiveSign: "??", negativeSign: "-", expectedSuccess: True, expected: �) [FAIL]
      Assert.Equal() Failure: Values differ
      Expected: True
      Actual:   False
      Stack Trace:
        /_/src/libraries/System.Runtime/tests/System.Runtime.Tests/System/DoubleTests.cs(1446,0): at System.Tests.DoubleTests.Parse_CustomSigns(String value, String positiveSign, String negativeSign, Boolean expectedSuccess, Double expected)
           at InvokeStub_DoubleTests.Parse_CustomSigns(Object, Span`1)
        /_/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.cs(217,0): at System.Reflection.MethodBaseInvoker.InvokeWithManyArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

cc: @tarekgh this is appearing on CoreCLR Windows