The stable kernel trees are quite active, often seeing several releases in
a week’s time. But they are also meant to be … well … stable, so a lot
of effort goes into trying to ensure that they do not introduce new bugs or
regress the kernel’s functionality. One of the stable maintainers, Sasha
Levin, gave a talk at the virtual
Open
Source Summit North America that described the process of ensuring that
these trees are carefully managed so that they can provide a stable base for their users.

Source: LWN.net – [$] Maintaining stable stability