How many -stable patches introduce new bugs?

The -stable kernel release process faces a contradictory set of constraints. Developers naturally want to get as many fixes into -stable as possible but, at the same time, there is a strong desire to avoid introducing new regressions there. Each -stable release is, after all, intended to be more stable than its predecessor. At times there have been complaints that -stable is too accepting and too prone to regressions, but not many specifics. But, it turns out, this is an area where at least a little bit of objective research can be done.

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