[CI Postmortem] Windows bot VSM-XAM-126: 'Dotnet tests' consistently failing (path not found)

[rolfbjarne]

Summary

The Windows CI bot VSM-XAM-126 has a 44% job failure rate (8/18) across 7 unrelated PRs this week. All failures in the 'Dotnet tests' job produce:

Path does not exist: c:\AzDO\_work\8\s\macios\tests\TestSummary.md

This suggests the test run on this bot fails before producing results, likely due to a misconfigured or stale workspace.

Affected PRs

#25079, #25105, #25204, #25220, #25227, #25229, #25235

Classification

• Type: Infrastructure — bot-specific
• Impact: 8 failed jobs across 7 PRs in one week
• Confidence: High — 100% of 'Dotnet tests' failures on this bot have the same path error; other bots (VSM-XAM-133, 135, 141) show similar but less concentrated patterns

Other Windows Bots

Bot	Failed/Total	Rate	PRs
VSM-XAM-126	8/18	44%	25079, 25105, 25204, 25220, 25227, 25229, 25235
VSM-XAM-141	3/6	50%	25079, 25195, 25238
VSM-XAM-133	3/10	30%	25079, 25195, 25229
VSM-XAM-135	3/9	33%	25204, 25231

Other Windows bots (133, 135, 141) also have elevated failure rates with similar Path does not exist errors (different drive letters: C:, D:).

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Filed automatically by CI postmortem analysis.