Bug#631314: [cowbuilder] --create fails when removing original tree
reassign 631314 cowbuilder
I reproduced this problem using cowbuilder at my machine and then started trying to track it down. After checking debootstrap code it seemed it was doing the right thing and thus I created two chroot (regular and buildd) and removed them and all worked fine.
It does seem to be an issue with cowbuilder. Reassigning according.