[CI] SOS.UnitTests desktop.cli tests fail with 'Failed to load data access module' (mscordacwks.dll mismatch)

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  • #5758 来自 @steveisok —— 已关闭，未合并

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难度
4/5
预计耗时
3-5 天
新手友好度
45/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
领域
ci-cd, devops, testing-qa

调研方向

从失败的 SOS.UnitTests_net8.0_x64.log 和 SOS.UnitTests_net8.0_x86.log 构件开始，重点关注 desktop.cli 和 DualRuntimes 配置。验证 CI 代理上的 .NET Framework 版本，以及已配置的符号路径是否提供匹配的 mscordacwks.dll；同时检查 cdb-sos 包版本。列出的 Windows rolling 构建全部通过，并且 SOS 命令生成的输出与其测试正则表达式匹配，即表示完成。

由索引模型根据 Issue 内容生成。

描述

bug

Summary

15 SOS.UnitTests with config: desktop.cli (and 2 DualRuntimes tests) are consistently failing on all Windows rolling CI legs (diagnostics-public-ci, definition 25) since approximately Mar 10, 2026. The pipeline is currently red — the last 2 consecutive rolling builds both failed.

Root Cause

All failing tests hit the same error from CDB/SOS:

Failed to load data access module, 0x80004002
Verify that 1) you have a recent build of the debugger (10.0.18317.1001 or newer)
            2) the file mscordacwks.dll that matches your version of clr.dll is
                in the version directory or on the symbol path

The SOS commands (!PrintException, !ClrStack, !DumpObj, etc.) produce no diagnostic output because the DAC cannot be loaded for the .NET Framework CLR in the debuggee process. The test regex verification then fails because there is no output to match.

This occurs 17 times across the test suite in a single run. The failure is deterministic — identical tests fail on both x64 and x86 with the same error.

Likely Cause

A .NET Framework servicing update on the CI agent machines introduced a new clr.dll version, but the matching mscordacwks.dll is not available on the configured symbol path. See closed issue #4625 for a prior occurrence of missing mscordacwks symbols.

Affected Builds

Build Date Failed Legs
1332940 Mar 12 Win x64 Debug, Win x64 Release, Win x86 Release
1332642 Mar 12 Win x64 Debug, Win x64 Release, Win x86 Release
1327950 Mar 10 Win x86 Release

Last passing rolling build: 1330114 (Mar 11).

Failing Tests (15 on x64, 14 on x86)

All desktop.cli config:

  • SOS.TaskNestedException, SOS.LineNums, SOS.DivZero, SOS.SimpleThrow, SOS.Reflection
  • SOS.StackTraceFaultingExceptionFrame, SOS.GCTests, SOS.OtherCommands
  • SOS.NestedExceptionTest, SOS.Overflow, SOS.DumpGen, SOS.ConcurrentDictionaries, SOS.AsyncMain

Plus projectk.sdk.prebuilt config:

  • SOS.DualRuntimes (9.0.12), SOS.DualRuntimes (8.0.23)

Reproduction

Artifacts with full test logs are available at:

  • Logs_Windows_x64_Release_1 → log/Release/SOS.UnitTests_net8.0_x64.log
  • Logs_Windows_x86_Release_1 → log/Release/SOS.UnitTests_net8.0_x86.log

Suggested Fix

  1. Verify which .NET Framework version is currently on the CI agents
  2. Ensure the symbol server path is configured so CDB can download the matching mscordacwks.dll, or bundle the correct DAC version
  3. Alternatively, investigate whether the cdb-sos NuGet package (currently 10.0.26100.1) needs updating to match the new agent environment
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