Hi,
on jessie, after invoking ecryptfs-setup-swap it would fail activating
the swap. This is due to some internal mechanism on cryptsetup part not
setting up the mapped device if partition type does not match.
As a workaround I had to set the Partition type to "Linux" (83 in MBR, I
think 15 in GPT) - after a reboot encrypted swap would be activated
As for this problem: Please put it back in testing. The problem does not
lie within ecryptfs, the setup is correct. It is cryptsetup not handling
it properly.
Best Regards,
Christian Hawkins