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[Luis Henriques <luis.henriques@xxxxxxxxxxxxx>]

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

Status in linux package in Ubuntu:
  Triaged

Bug description:
  After upgrading to the proposed kernel for Trusty (3.13.0-72.115) I
  cannot unlock a luks formatted usb drive. The cryptsetup process seems
  to hang with the following stack:

  [<ffffffff810c71be>] __synchronize_srcu+0xfe/0x180
  [<ffffffff810c725d>] synchronize_srcu+0x1d/0x20
  [<ffffffff815beed7>] __dm_destroy+0x117/0x290
  [<ffffffff815bfd83>] dm_destroy+0x13/0x20
  [<ffffffff815c570e>] dev_remove+0xde/0x120
  [<ffffffff815c5dd5>] ctl_ioctl+0x255/0x500
  [<ffffffff815c6093>] dm_ctl_ioctl+0x13/0x20
  [<ffffffff811d1750>] do_vfs_ioctl+0x2e0/0x4c0
  [<ffffffff811d19b1>] SyS_ioctl+0x81/0xa0
  [<ffffffff817356dd>] system_call_fastpath+0x1a/0x1f
  [<ffffffffffffffff>] 0xffffffffffffffff

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