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Find the Commit That Broke It with git bisect, Including Automated Test Runs

Self-Hosting & Infra intermediate 6 min read $0.01 Updated 2026-10-20

Using git bisect: marking good and bad commits, automating with git bisect run, exit code 125 to skip untestable commits, handling build failures, merge commits, resetting, and capturing the result in a bug report.

A bug appeared sometime in the last 200 commits. git bisect finds the exact breaking commit in about eight steps, manually or fully automated with a test script and the right exit codes.

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