Git Bisecting a Bug (Apache NuttX RTOS)
The article explains using Git Bisect to identify a bug in Apache NuttX RTOS, revealing Commit #235 as problematic, but further tests showed Commit #132 as the true source of the issue.
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The article discusses the process of identifying a bug in the Apache NuttX RTOS using Git Bisect, a tool that helps locate the commit that introduced a bug by performing a binary search through the commit history. The authors encountered a runtime bug and determined that the problematic commit was among 468 commits. They utilized Git Bisect to automate the testing of these commits, employing a script to assess whether each commit was "good" or "bad." The process involved simulating tests and running continuous integration (CI) tests within a Docker container to evaluate the commits. Ultimately, the bisecting process identified Commit #235 as the initial bad commit. However, upon further testing, it was revealed that Commit #132 was actually the true breaking commit, indicating that the results can vary based on the testing environment and conditions. The article emphasizes the importance of thorough testing and the potential for discrepancies in identifying the source of bugs.
- Git Bisect is an effective tool for identifying problematic commits in a codebase.
- Automated testing scripts can streamline the process of determining commit quality.
- Continuous integration tests can be run in isolated environments like Docker to replicate issues.
- Results from Git Bisect may vary, necessitating multiple tests to confirm findings.
- The identification of breaking commits can change based on the testing conditions and environment.
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A new "mix testing" approach uncovers compiler bugs by compiling test fragments with different compilers. Examples show issues in x86 and Arm architectures, emphasizing the importance of maintaining instruction ordering. Luke Geeson developed a tool to explore compiler combinations, identifying bugs and highlighting the need for clearer guidelines.
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