Looks like this kernel has a bad backport of upstream commit 2a708cff93f1 ("dm:
fix AB-BA deadlock in __dm_destroy()").
To confirm this, I've uploaded a test kernel with this backport reverted:
http://people.canonical.com/~henrix/lp1522766/v1/
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https://bugs.launchpad.net/bugs/1522766
Title:
cryptsetup hangs after kernel upgrade to 3.13.0-72.115
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