As of ISO 2014.11.01 attempts to install packages within the live system
itself can cause complete system failure, apparently due to problems
affecting device mapper.
The problem is a regression that can't be seen with ISO 2014.10.01.
It doesn't always appear and I couldn't find out the exact conditions.
But it seems the number / volume of packages that are about to be
installed has to exceed some kind of threshold.
Also, it doesn't affect running pacstrap the usual way.
Attaching journalctl output from a KVM/QEMU instance (behaviour is the
same booting "bare metal", though).
Regards.
