OK, on a non-luks encrypted bog-standard lvm2 install of the latest trusty tahr.
Note: the original bug was already solved. The case where the output of the 
lv-snapshot creation is directed to a file on the volume being snapshotted is a 
mixed bag with the latest trusty tahr. The first time it went OK; the second 
time I used a single verbosity flag, and it hung:
lvcreate -v -s -p r -L 700M -n oscopy /dev/mapper/ubuntu--vg-root 2>/root/log
(Tried both a few times, no -v no hang, at least one -v and it hangs.)

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https://bugs.launchpad.net/bugs/1096520

Title:
  lvm2 hangs when creating snapshot of live root and IO to the root
  filesystem is happening

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