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[Bug 1522766] Re: cryptsetup hangs after kernel upgrade to 3.13.0-72.115


This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
vivid' to 'verification-done-vivid'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!

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  cryptsetup hangs after kernel upgrade to 3.13.0-72.115

Status in linux package in Ubuntu:
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Vivid:
  Fix Committed

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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