[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",
  "ErrorPattern": "IsIanaIdTest",
  "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
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	5	5

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[steveisok]

We should really stop running this on .net 8.