Bug#510544: Installer/partition guide tried to use 500GB as swap
Looks like it's a problem with conversion to logical extents.
After running the recipe, perform_recipe_by_lvm settles on
3246000 0 3246000 linux-swap ...
that is, on a 3GB swap, which is correct (300% of the 1GB RAM).
However, it issues
lv_create noc2 swap_1 1406
to create it, thus creating a 1406 extent big (5.6GB) LV. This is to
use up all the remaining extents. So the main LV got a little bit too
small... Roundoff, maybe? TBC.