A friend of mine just ran into this and we spent some time debugging it.

Long story short, I stumbled onto an lkml thread that seemed related
[1].

Something tytso said in his first reply [2], and the fact that the root
fs was ext4, led me to try:

echo 4 > /sys/fs/ext4/sda1/max_writeback_mb_bump

and suddenly the dpkg that had been stuck for at least 30 minutes
started doing things again. I wish we had figured it out before giving
up on the dpkg that had been stuck since January and forcing a reboot.

[1] http://thread.gmane.org/gmane.linux.kernel/949268/
[2] "So I added a forced override for ext4, which now writes 128MB at a time 
--- with a sysfs tuning knob that allow the old behaviour to be restored if 
users really complained."

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https://bugs.launchpad.net/bugs/624877

Title:
  INFO: task dpkg:23317 blocked for more than 120 seconds.

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