Regarding execstack – We have not encountered this error before. So you will have to try and see if that command has to be executed each time. If so, it should be possible for you to add it to bdp.sh. Please do give us an update on that so we can add it to our FAQ.
Regarding mask – Can you check your T1 mask as well.
And share all the logs that BDP spits out on the terminal. That will help narrow down which masking step is failing.