Seeing the same problem here on a desktop machine when doing dd of 40GB image. 
Couldn't log in via ssh until dd was finished.
This was repeated in dmesg every 120 seconds:
[ 2520.696276] INFO: task ionice:2393 blocked for more than 120 seconds.

Colin:  your suggestion
    echo 10 | sudo tee /proc/sys/vm/dirty_ratio

Seems to have fixed the problem for me. Thanks.

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https://bugs.launchpad.net/bugs/988799

Title:
  Precise freezes under heavy i/o

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