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[fix] Fix HTML logger parallel file collision - #15435
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Add pre-build environment setup section that detects when .dotnet contains binaries for the wrong OS and cleans .dotnet, .packages, and artifacts for a fresh bootstrap. Update all build/test commands to show both Linux/macOS and Windows equivalents with a quick-reference table. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
…sification - Add PowerShell OS detection alongside bash - Add guidance for extracting OS-specific commands from tables - Add placeholder substitution and cross-platform adaptation rules - Use SQL tracking table instead of markdown table - Distinguish ENV_ISSUE from ERROR in result classification - Improve Fix or Flag section with actionable steps per status Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- eng/build.ps1: Forward exit code from Arcade build script using \�xit \0\ to ensure non-zero exit codes are propagated to the caller - eng/common/tools.ps1: Add diagnostic log message before exiting so the exit code is visible in build output - .github/skills/vstest-build-test/SKILL.md: Fix Windows test filter flag from \-p\ to \-projects\ since \-p\ is ambiguous in PowerShell and does not work as expected Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
When multiple vstest processes run in parallel with the HTML logger, temporary XML result files could collide because the timestamp-based filename only has second-level precision, and the in-process lock doesn't prevent cross-process races. Changes: - Include process ID in the temp XML filename for cross-process uniqueness - Replace File.Exists + File.Create with atomic FileMode.CreateNew to handle any remaining race conditions gracefully via retry - Remove unused FileCreateLockObject (cross-process lock was ineffective) Fixes: #15404 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Add build commands, test project mappings, repository structure, logger architecture notes, and analyzer pitfalls to copilot-instructions.md. Update vstest-build-test skill with logger-specific notes covering TRX and HTML logger architecture, test patterns, and common analyzer issues. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
Fixes cross-process temp XML filename collisions in the HTML logger when multiple vstest.console instances run in parallel.
Changes:
- Adds PID to the temp XML filename and switches to
FileMode.CreateNewfor atomic “create if not exists”. - Adds a unit test to validate the PID is present in the generated XML path.
- Updates build/doc tooling and authoring docs for repo build/test guidance.
Reviewed changes
Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| test/Microsoft.TestPlatform.Extensions.HtmlLogger.UnitTests/HtmlLoggerTests.cs | Adds a unit test asserting PID is included in the temp XML filename. |
| src/Microsoft.TestPlatform.Extensions.HtmlLogger/HtmlLogger.cs | Adds PID to filename and uses FileMode.CreateNew for atomic file creation; removes ineffective in-proc lock. |
| eng/common/tools.ps1 | Adds an extra console message when exiting with an exit code. |
| eng/build.ps1 | Attempts to forward the exit code from the invoked Arcade build script. |
| .github/skills/vstest-build-test/SKILL.md | Adds repo-specific build/test instructions and logger notes. |
| .github/skills/validate-skills/SKILL.md | Adds a procedure for validating that documented skill commands work. |
| .github/skills/creating-skills/SKILL.md | Adds guidance for creating skill files and frontmatter. |
| .github/copilot-instructions.md | Adds build/test command guidance and repository structure notes. |
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When multiple vstest processes run in parallel with the HTML logger, temporary XML result files could collide because the timestamp-based filename only has second-level precision, and the in-process lock doesn't prevent cross-process races. Changes: - Add millisecond precision to temp XML filename timestamp (HHmmss → HHmmssfff) to greatly reduce collision likelihood across parallel processes - Replace File.Exists + File.Create with atomic FileMode.CreateNew to handle any remaining race conditions gracefully via retry - Remove unused FileCreateLockObject (cross-process lock was ineffective) Fixes: #15404 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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needs merge of #15434 |
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
| - **Temp XML naming:** `TestResult_{user}_{machine}_{timestamp}_{pid}.xml` — PID ensures cross-process uniqueness | ||
| - **File creation:** Uses `FileMode.CreateNew` for atomic creation with retry on collision |
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Same issue as in copilot-instructions.md: the documented filename pattern includes {pid} but the actual code does not add a PID to the filename. The uniqueness strategy relies on millisecond timestamps plus FileMode.CreateNew with retry. This documentation should be corrected to match the actual implementation.
| - **Temp XML naming:** `TestResult_{user}_{machine}_{timestamp}_{pid}.xml` — PID ensures cross-process uniqueness | |
| - **File creation:** Uses `FileMode.CreateNew` for atomic creation with retry on collision | |
| - **Temp XML naming:** `TestResult_{user}_{machine}_{timestamp}.xml` — timestamp-based name only (no PID) | |
| - **File creation:** Uses `FileMode.CreateNew` for atomic creation with retry on collision; millisecond timestamps + `CreateNew` retries provide uniqueness |
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: Youssef Victor <youssefvictor00@gmail.com>
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Summary
Fixes #15404
When multiple vstest.console processes run in parallel with the HTML logger, temporary XML result files can collide because:
yyyyMMdd_HHmmss) only has second-level precisionlock (FileCreateLockObject)doesn't prevent cross-process racesChanges
src/Microsoft.TestPlatform.Extensions.HtmlLogger/HtmlLogger.csHHmmsstoHHmmssfff, greatly reducing collision likelihood across parallel processesFileMode.CreateNewfor atomic file creation - replaces theFile.Exists+File.Createpattern with an atomic create-if-not-exists operation that retries onIOExceptionFileCreateLockObject- the cross-process lock was ineffectivetest/Microsoft.TestPlatform.Extensions.HtmlLogger.UnitTests/HtmlLoggerTests.csXmlFilePathShouldContainMillisecondTimestampForCrossProcessUniquenesstestDocumentation
.github/copilot-instructions.mdwith build/test commands, repo structure, and logger architecture.github/skills/vstest-build-test/SKILL.mdwith logger-specific notesTesting
All 34 HTML logger unit tests pass on both net9.0 and net48.