Find the commit that introduced a bug with git bisect
domain: git-scm.com · 8 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Start a bisect session and mark the current broken commit as bad: `git bisect start` then `git bisect bad`.
Mark a known-good commit: `git bisect good <old-good-rev>` (e.g. `git bisect good v2.6.13-rc2`); Git checks out a middle commit and reports how many revisions are left to test.
Test the checked-out commit: if it works run `git bisect good`; if still broken run `git bisect bad`. Repeat until Git reports the exact first bad commit.
For a non-bug change (performance regression, finding a fix) use `git bisect start` then the `old`/`new` terms instead of good/bad; do not mix the two term sets.
Skip commits you cannot test with `git bisect skip` or a range `git bisect skip v2.5..v2.6`.
Finish and return to your original HEAD with `git bisect reset`.
Official docs: https://git-scm.com/docs/git-bisect
Known gotchas
The first bad commit is reported only after the binary search completes; skipping a commit adjacent to the target means Git cannot pin down the exact first-bad commit.
You cannot mix good/bad with old/new terms in one session.
Exit code 125 is reserved — a `git bisect run` script must `exit 125` for untestable revisions so Git skips them; use 0 for good and 1-127 for bad.
Use `--no-checkout` (bare repos / no working tree needed) or `--first-parent` (merge-heavy history) to avoid false positives.
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