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[Scott Moser <ssmoser2+ubuntu@xxxxxxxxx>]

Public bug reported:

On xenial only:

$ wget http://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-disk1.img
$ cp -a xenial-server-cloudimg-amd64-disk1.img disk.img
$ sudo mount-image-callback -v disk.img truewaiting on pidfile for /dev/nbd0 in /sys/block/nbd0/pid
connected disk.img (qcow2) to /dev/nbd0. waiting for device.
partitioned disk.
waiting for /dev/nbd0p1 part=1 to be ready.
waiting for /dev/nbd0p1 part=1 to be ready.
waiting for /dev/nbd0p1 part=1 to be ready.
waiting for /dev/nbd0p1 part=1 to be ready.
waiting for /dev/nbd0p1 part=1 to be ready.
waiting for /dev/nbd0p1 part=1 to be ready.
waiting for /dev/nbd0p1 part=1 to be ready.
waiting for /dev/nbd0p1 part=1 to be ready.
waiting for /dev/nbd0p1 part=1 to be ready.
gave up on waiting for /dev/nbd0p1
$ echo $?
1

This fix seems to work and should be safe.
=== modified file 'bin/mount-image-callback'
--- bin/mount-image-callback    2018-01-03 15:44:47 +0000
+++ bin/mount-image-callback    2018-01-04 17:21:23 +0000
@@ -316,6 +316,8 @@
        fi
 
        i=0
+       [ -b "$mdev" ] || blockdev --rereadpt $nbd ||
+               { error "blockdev --rereadpt $nbd failed"; return 1; }
        while :; do
                [ -b "$mdev" ] && break
                i=$(($i+1))

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: cloud-image-utils 0.27-0ubuntu24
ProcVersionSignature: User Name 4.4.0-104.127-generic 4.4.98
Uname: Linux 4.4.0-104-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.14
Architecture: amd64
Date: Thu Jan  4 17:23:15 2018
Ec2AMI: ami-00000388
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.small
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
PackageArchitecture: all
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: cloud-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: cloud-utils (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: cloud-utils (Ubuntu Xenial)
     Importance: Undecided
         Status: Fix Released

** Affects: cloud-utils (Ubuntu Artful)
     Importance: Undecided
         Status: Fix Released

** Affects: cloud-utils (Ubuntu Bionic)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug ec2-images xenial

** Also affects: cloud-utils (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: cloud-utils (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: cloud-utils (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Changed in: cloud-utils (Ubuntu Xenial)
       Status: New => Fix Released

** Changed in: cloud-utils (Ubuntu Artful)
       Status: New => Fix Released

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भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1741300

Title:
  mount-image-callback fails on qcow image on xenial

Status in cloud-utils package in Ubuntu:
  New
Status in cloud-utils source package in Xenial:
  Fix Released
Status in cloud-utils source package in Artful:
  Fix Released
Status in cloud-utils source package in Bionic:
  New

Bug description:
  On xenial only:

  $ wget http://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-disk1.img
  $ cp -a xenial-server-cloudimg-amd64-disk1.img disk.img
  $ sudo mount-image-callback -v disk.img truewaiting on pidfile for /dev/nbd0 in /sys/block/nbd0/pid
  connected disk.img (qcow2) to /dev/nbd0. waiting for device.
  partitioned disk.
  waiting for /dev/nbd0p1 part=1 to be ready.
  waiting for /dev/nbd0p1 part=1 to be ready.
  waiting for /dev/nbd0p1 part=1 to be ready.
  waiting for /dev/nbd0p1 part=1 to be ready.
  waiting for /dev/nbd0p1 part=1 to be ready.
  waiting for /dev/nbd0p1 part=1 to be ready.
  waiting for /dev/nbd0p1 part=1 to be ready.
  waiting for /dev/nbd0p1 part=1 to be ready.
  waiting for /dev/nbd0p1 part=1 to be ready.
  gave up on waiting for /dev/nbd0p1
  $ echo $?
  1

  This fix seems to work and should be safe.
  === modified file 'bin/mount-image-callback'
  --- bin/mount-image-callback    2018-01-03 15:44:47 +0000
  +++ bin/mount-image-callback    2018-01-04 17:21:23 +0000
  @@ -316,6 +316,8 @@
          fi
   
          i=0
  +       [ -b "$mdev" ] || blockdev --rereadpt $nbd ||
  +               { error "blockdev --rereadpt $nbd failed"; return 1; }
          while :; do
                  [ -b "$mdev" ] && break
                  i=$(($i+1))

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: cloud-image-utils 0.27-0ubuntu24
  ProcVersionSignature: User Name 4.4.0-104.127-generic 4.4.98
  Uname: Linux 4.4.0-104-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.14
  Architecture: amd64
  Date: Thu Jan  4 17:23:15 2018
  Ec2AMI: ami-00000388
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  PackageArchitecture: all
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: cloud-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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