@Jonathan: Yes, I agree that this is clearly related to the NetworkManager. That said I'm not convinced that is an actual bug in Network Manager. For example; compare to sshd, which doesn't have any trouble with Network Manager and its ipv6 behavior.
Anyway, I'm changing the Status to Confirmed. While we have yet to triage the actual cause we have definitely confirmed the issue.
@Jonathan: Yes, I agree that this is clearly related to the NetworkManager. That said I'm not convinced that is an actual bug in Network Manager. For example; compare to sshd, which doesn't have any trouble with Network Manager and its ipv6 behavior.
Anyway, I'm changing the Status to Confirmed. While we have yet to triage the actual cause we have definitely confirmed the issue.