** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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

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  [Ubuntu 18.04] cryptsetup: 'device-mapper: reload ioctl on  failed'
  when setting up a second end-to-end encrypted disk

Status in Ubuntu on IBM z Systems:
Status in linux package in Ubuntu:

Bug description:
  Problem Description:
  Environment: z14 VM Guest system with one CEX6C CCA coprocessor
  in toleration mode (i.e. CEX6 HW presented as CEX5)
  OS: Ubuntu 18.04 Prerelease
  Setting up a second dm-crypt device using protected CCA paes-xts keys fails.
  The problem is reproducible.

  Setting up two or more plain end-to-end encrypted disks using 'cryptsetup'
  fails when using a cipher based on the protected key mechanism.
  The setup needs the paes and pkey modules loaded, the former providing the
  paes-xts-plain64 cipher (cat /proc/crpyto |grep paes).

  A second attempt to establish an end-to-end encrypted disk fails
  with : "device-mapper: reload ioctl on failed: No such file or directory."

  The problem is independent of the second encrypted disk being based on
  a second DASD or second partition on one DASD.

  ---uname output---
  Linux s3514004 4.13.0-25-generic #29-Ubuntu SMP Mon Jan 8 21:15:56 UTC 2018 
s390x s390x s390x GNU/Linux

  ---Steps to Reproduce---
  1.) The following cryptsetup statement works, and is the first one I issued.
  cryptsetup plainOpen --key-file securekey.bin --key-size 1024 --cipher 
paes-xts-plain64 /dev/disk/by-path/ccw-0.0.NNNN-part1 enc-pv1
  2.) After this successful statement, I issued the following:
  cryptsetup plainOpen --key-file securekey.bin --key-size 1024 --cipher 
paes-xts-plain64 /dev/disk/by-path/ccw-0.0.NNNN-part2 enc-pv2
  device-mapper: reload ioctl on failed: No such file or directory.

  See attached patch (comment #1) as fix.

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