On the grsecurity.net homepage I see that 3.14.9 is flagged as stable. Does it mean that we can trust 3.14 to be maintained for some years ? Sorry if that question has been beaten to death, but I can't find easily any annoucement.
Yes, that's correct. We will be supporting it as a stable release just like our 3.2 tree. At some point 3.2 will be phased out like we did with 2.6.32, but it won't be for at least a year I imagine.