It is a conflict between lxc/kvm (at least in my case). Could you please confirm kvm not allocating pty dynamicaly? As lxc not doing it dynamicaly? Raising conflicts if kvm-guests where started, after them lxc-guest are started, then kvm-guests are stoped , then started again, trying the next pty, but this being occupied by an lxc host?
After a few further test, I am quite sure:
It is a conflict between lxc/kvm (at least in my case). Could you please confirm kvm not allocating pty dynamicaly? As lxc not doing it dynamicaly? Raising conflicts if kvm-guests where started, after them lxc-guest are started, then kvm-guests are stoped , then started again, trying the next pty, but this being occupied by an lxc host?