Public bug reported:

Spotted in this cycle with node:
 * daedalus (amd64-lowlatency) - https://pastebin.ubuntu.com/p/JxYNh9JPJd/
 * daedalus (amd64-generic) - https://pastebin.ubuntu.com/p/4W8gDSDVqm/
 * kernel01 (s390x.zVM) - https://pastebin.ubuntu.com/p/kFW7KQbbkf/
 
Error log from kernel01:
creating backing nbd image /tmp/nbd_image.img
 
--------------------------------------------------------------------------------
Image path:    /tmp/nbd_image.img
Mount point:   /mnt/nbd-test-22282
Date:          Mon Dec 10 05:22:47 EST 2018
Host:          kernel01
Kernel:        4.4.0-141-generic #167-Ubuntu SMP Wed Dec 5 10:32:22 UTC 2018
Machine:       kernel01 s390x s390x
CPUs online:   8
CPUs total:    8
Page size:     4096
Pages avail:   641567
Pages total:   977383
Free space:
Filesystem                                           Size  Used Avail Use% 
Mounted on
udev                                                 1.9G     0  1.9G   0% /dev
tmpfs                                                382M   39M  344M  11% /run
/dev/dasda1                                          6.7G  6.2G  187M  98% /
tmpfs                                                1.9G  4.0K  1.9G   1% 
/dev/shm
tmpfs                                                5.0M     0  5.0M   0% 
/run/lock
tmpfs                                                1.9G     0  1.9G   0% 
/sys/fs/cgroup
/dev/mapper/datavg-home                               21G  3.1G   17G  17% /home
testpool.36226                                        24G  128K   24G   1% 
/testpool.36226
testpool.36226/testfs.36226                           24G  128K   24G   1% 
/var/tmp/testdir36226
testpool.36226/testfs.36226/clone                     24G  128K   24G   1% 
/var/tmp/testdir36226/clone
testpool.36226/testfs.36226/renameme                  24G  128K   24G   1% 
/var/tmp/testdir36226/renameme
testpool.36226/testfs.36226/shared                    24G  128K   24G   1% 
/var/tmp/testdir36226/shared
testpool.36226/testfs.36226/testfs2.36226             24G  128K   24G   1% 
/var/tmp/testdir36226/testfs2.36226
testpool.36226/testfs.36226/testfs2.36226.unmounted   24G  128K   24G   1% 
/var/tmp/testdir36226/testfs2.36226.unmounted
testpool.36226/testfs.36226/unshared                  24G  128K   24G   1% 
/var/tmp/testdir36226/unshared
tmpfs                                                382M     0  382M   0% 
/run/user/1000
tmpfs                                                100K     0  100K   0% 
/var/lib/lxd/shmounts
tmpfs                                                100K     0  100K   0% 
/var/lib/lxd/devlxd
--------------------------------------------------------------------------------
 
NBD device /dev/nbd0 created
found nbd export
NBD exports found:
test
starting clien with NBD device /dev/nbd0
Negotiation: ..size = 128MB
creating ext4 on /dev/nbd0
mkfs on /dev/nbd0 failed
unmounting /mnt/nbd-test-22282
stopping client
disconnect, sock, done
killing server
stderr:
bs=1024, sz=134217728 bytes
timeout=30
umount: /mnt/nbd-test-22282: mountpoint not found

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-141-generic 4.4.0-141.167
ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic s390x
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: 
ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not 
found.
Date: Tue Dec 11 04:08:37 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lspci:
 
Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:
 
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=UUID=44b0b919-a1a4-4849-9425-e71d4ac87d85 
crashkernel=196M nobp=1 BOOT_IMAGE=0
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-141-generic N/A
 linux-backports-modules-4.4.0-141-generic  N/A
 linux-firmware                             1.157.21
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug package-from-proposed s390x xenial

** Summary changed:

- ubuntu_nbd_smoke_test failed with Bionic
+ ubuntu_nbd_smoke_test failed with Xenial

** Also affects: ubuntu-kernel-tests
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1807869

Title:
  ubuntu_nbd_smoke_test failed with Xenial

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