it can be that someone just volunteers to maintain it after Greg finishes with it, it can be that one (or more in the case of ) major distros base their release kernel off of it, and as a result someone takes on the maintenance of the kernel after it would finish the normal process.
about the only criteria is an elimination criteria. Namely that the kernel in question must not have a disastrous amount of regressions discovered in the normal -stable period.
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