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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1386339

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1386339

Title:
  cryptswap can fail if random data matches a filesystem magic number

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I noticed that my encrypted swap was not working, and I found that the
  randomly generated encrypted filesystem had randomly generated data
  that had the magic number of a filesystem type, and hence ever more it
  refused to start...

  Eg:-

  root@hardline:/etc# more /etc/crypttab
  cryptswap1 /dev/sda3 /dev/urandom swap,cipher=aes-cbc-essiv:sha256

  root@hardline:/etc# cryptdisks_start cryptswap1
   * Starting crypto disk...                                                       * cryptswap1 (starting)..
   * cryptswap1: the precheck for '/dev/sda3' failed:  - The device /dev/sda3 contains a filesystem type hfsplus.
   * cryptswap1 (failed)...                                                [fail] 

  Obviosuly this is not a filesystem:-

  root@hardline:/etc# mount -t hfsplus /dev/sda3 /mnt
  mount: wrong fs type, bad option, bad superblock on /dev/sda3,
         missing codepage or helper program, or other error

  So I blanked it and restarted, all is now well... perhaps if there's a
  force option on cryptsetup this should be used in the setup scripts:-

  root@hardline:/etc# dd if=/dev/zero of=/dev/sda3
  ^C684121+0 records in
  684121+0 records out
  350269952 bytes (350 MB) copied, 5.96378 s, 58.7 MB/s

  root@hardline:/etc# cryptdisks_start cryptswap1
   * Starting crypto disk...                                                       * cryptswap1 (starting)..
   * cryptswap1 (started)...                                               [ OK ]

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