[Bug 1747044] Re: kpartx 0.7.4-2ubuntu1 in bionic does not remove loop devices

[Julian Andres Klode]

Surprisingly enough kpartx -d /dev/loop<foo> works.

** Changed in: multipath-tools (Ubuntu)
       Status: Confirmed => Won't Fix

** Changed in: multipath-tools (Ubuntu)
       Status: Won't Fix => In Progress

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https://bugs.launchpad.net/bugs/1747044

Title:
  kpartx 0.7.4-2ubuntu1 in bionic does not remove loop devices

Status in multipath-tools package in Ubuntu:
  In Progress

Bug description:
  We're seeing a problem now when running livecd-rootfs in bionic with
  kpartx from 0.7.4-2ubuntu1. The issue appears to be the result in a
  change in kpartx, as a result, the /dev/loop devices are not getting
  deleted. The best data I have from this so far is a comparison between
  old and current build logs. The old logs showed:

  ++ kpartx -v -d binary/boot/disk-uefi.ext4
  + kpartx_stdout='del devmap : loop0p15
  del devmap : loop0p14
  del devmap : loop0p1
  loop deleted : /dev/loop0'
  + echo 'del devmap : loop0p15
  del devmap : loop0p14
  del devmap : loop0p1
  loop deleted : /dev/loop0'

  Thew new logs show:

  ++ kpartx -v -d binary/boot/disk-uefi.ext4
  + kpartx_stdout=
  + echo ''

  The code being run is from the 'functions' in lp:livecd-rootfs. In the
  current runs, kpartx_stdout is an empty string:

  clean_loops() {
      local kpartx_ret
      local kpartx_stdout

      if [ -n "${backing_img}" ]; then
          # sync before removing loop to avoid "Device or resource busy" errors
          sync
          kpartx_ret=""
          kpartx_stdout=$(kpartx -v -d "${backing_img}") || kpartx_ret=$?
          echo "$kpartx_stdout"
          if [ -n "$kpartx_ret" ]; then
              if echo "$kpartx_stdout" | grep -q "loop deleted"; then
                  echo "Suppressing kpartx returning error (#860894)"
              else
                  exit $kpartx_ret
              fi
          fi
          unset backing_img
      fi

      if [ -z "${rootfs_dev_mapper}" ]; then
          return 0
      fi

      unset loop_device
      unset loop_raw
      unset rootfs_dev_mapper
  }

  I am doing some further debugging on this and am trying to reproduce
  this outside of launchpad. I am not able to post a full build log. But
  I can probably post a longer 'sanitized' bit.

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