So, it looks like this is an upstream bug.
-- Zlatko
Oh, I see now that the same bug is reported in the Redhat bug tracker:
https://bugzilla.redhat.com/show_bug.cgi?id=1373014
- Bug#836742: linux-image-4.7.0-1-amd64: PPTP VPN... Zlatko Čalušić
- Bug#836742: Acknowledgement (linux-image-4... Zlatko Čalušić
- Bug#836742: marked as done (linux-image-4.... Debian Bug Tracking System
