Public bug reported:

This test can pass if you run it manually on s390x zVM.

But it will fail when you try to run it with the smoke test suite on
jenkins.

And this issue was only spotted on this s390x zVM (kernel01)

  
--------------------------------------------------------------------------------
  Image path:    /tmp/nbd_image.img
  Mount point:   /mnt/nbd-test-21931
  Date:          Fri Nov 30 03:13:05 EST 2018
  Host:          kernel01
  Kernel:        4.4.0-140-generic #166-Ubuntu SMP Wed Nov 14 20:08:28 UTC 2018
  Machine:       kernel01 s390x s390x
  CPUs online:   8
  CPUs total:    8
  Page size:     4096
  Pages avail:   636227
  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  5.1G  1.2G  82% /
  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  1.8G   18G  10% 
/home
  testpool.36226                                        24G     0   24G   0% 
/testpool.36226
  testpool.36226/testfs.36226                           24G  128K   24G   1% 
/var/tmp/testdir36226
  testpool.36226/testfs.36226/clone                     24G     0   24G   0% 
/var/tmp/testdir36226/clone
  testpool.36226/testfs.36226/renameme                  24G     0   24G   0% 
/var/tmp/testdir36226/renameme
  testpool.36226/testfs.36226/shared                    24G     0   24G   0% 
/var/tmp/testdir36226/shared
  testpool.36226/testfs.36226/testfs2.36226             24G     0   24G   0% 
/var/tmp/testdir36226/testfs2.36226
  testpool.36226/testfs.36226/testfs2.36226.unmounted   24G     0   24G   0% 
/var/tmp/testdir36226/testfs2.36226.unmounted
  testpool.36226/testfs.36226/unshared                  24G     0   24G   0% 
/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
  
--------------------------------------------------------------------------------

  tcp6       0      0 :::9999                 :::*                    LISTEN    
  21955/nbd-server
  mount on /dev/nbd0 failed
  disconnect, sock, done
  stderr:
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  umount: /mnt/nbd-test-21931: not mounted

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-140-generic 4.4.0-140.166
ProcVersionSignature: Ubuntu 4.4.0-140.166-generic 4.4.162
Uname: Linux 4.4.0-140-generic s390x
NonfreeKernelModules: lttng_probe_writeback lttng_probe_workqueue 
lttng_probe_vmscan lttng_probe_udp lttng_probe_timer lttng_probe_sunrpc 
lttng_probe_statedump lttng_probe_sock lttng_probe_skb lttng_probe_signal 
lttng_probe_scsi lttng_probe_sched lttng_probe_rcu lttng_probe_random 
lttng_probe_printk lttng_probe_power lttng_probe_net lttng_probe_napi 
lttng_probe_module lttng_probe_kvm lttng_probe_kmem lttng_probe_jbd2 
lttng_probe_irq lttng_probe_compaction lttng_probe_block 
lttng_ring_buffer_metadata_mmap_client lttng_ring_buffer_client_mmap_overwrite 
lttng_ring_buffer_client_mmap_discard lttng_ring_buffer_metadata_client 
lttng_ring_buffer_client_overwrite lttng_ring_buffer_client_discard 
lttng_tracer lttng_statedump lttng_ftrace lttng_kprobes lttng_clock 
lttng_lib_ring_buffer lttng_kretprobes 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.
CurrentDmesg:

Date: Fri Nov 30 05:07:39 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-4.4.0-140-generic N/A
 linux-backports-modules-4.4.0-140-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

** Description changed:

  This test can pass if you run it manually on s390x zVM.
  
  But it will fail when you try to run it with the smoke test suite on
  jenkins.
  
+ And this issue was only spotted on this s390x zVM (kernel01)
  
-   
--------------------------------------------------------------------------------
-   Image path:    /tmp/nbd_image.img
-   Mount point:   /mnt/nbd-test-21931
-   Date:          Fri Nov 30 03:13:05 EST 2018
-   Host:          kernel01
-   Kernel:        4.4.0-140-generic #166-Ubuntu SMP Wed Nov 14 20:08:28 UTC 
2018
-   Machine:       kernel01 s390x s390x
-   CPUs online:   8
-   CPUs total:    8
-   Page size:     4096
-   Pages avail:   636227
-   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  5.1G  1.2G  82% /
-   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  1.8G   18G  10% 
/home
-   testpool.36226                                        24G     0   24G   0% 
/testpool.36226
-   testpool.36226/testfs.36226                           24G  128K   24G   1% 
/var/tmp/testdir36226
-   testpool.36226/testfs.36226/clone                     24G     0   24G   0% 
/var/tmp/testdir36226/clone
-   testpool.36226/testfs.36226/renameme                  24G     0   24G   0% 
/var/tmp/testdir36226/renameme
-   testpool.36226/testfs.36226/shared                    24G     0   24G   0% 
/var/tmp/testdir36226/shared
-   testpool.36226/testfs.36226/testfs2.36226             24G     0   24G   0% 
/var/tmp/testdir36226/testfs2.36226
-   testpool.36226/testfs.36226/testfs2.36226.unmounted   24G     0   24G   0% 
/var/tmp/testdir36226/testfs2.36226.unmounted
-   testpool.36226/testfs.36226/unshared                  24G     0   24G   0% 
/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
-   
--------------------------------------------------------------------------------
-    
-   tcp6       0      0 :::9999                 :::*                    LISTEN  
    21955/nbd-server
-   mount on /dev/nbd0 failed
-   disconnect, sock, done
-   stderr:
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
-          missing codepage or helper program, or other error
-   
-          In some cases useful info is found in syslog - try
-          dmesg | tail or so.
-   umount: /mnt/nbd-test-21931: not mounted
+   
--------------------------------------------------------------------------------
+   Image path:    /tmp/nbd_image.img
+   Mount point:   /mnt/nbd-test-21931
+   Date:          Fri Nov 30 03:13:05 EST 2018
+   Host:          kernel01
+   Kernel:        4.4.0-140-generic #166-Ubuntu SMP Wed Nov 14 20:08:28 UTC 
2018
+   Machine:       kernel01 s390x s390x
+   CPUs online:   8
+   CPUs total:    8
+   Page size:     4096
+   Pages avail:   636227
+   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  5.1G  1.2G  82% /
+   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  1.8G   18G  10% 
/home
+   testpool.36226                                        24G     0   24G   0% 
/testpool.36226
+   testpool.36226/testfs.36226                           24G  128K   24G   1% 
/var/tmp/testdir36226
+   testpool.36226/testfs.36226/clone                     24G     0   24G   0% 
/var/tmp/testdir36226/clone
+   testpool.36226/testfs.36226/renameme                  24G     0   24G   0% 
/var/tmp/testdir36226/renameme
+   testpool.36226/testfs.36226/shared                    24G     0   24G   0% 
/var/tmp/testdir36226/shared
+   testpool.36226/testfs.36226/testfs2.36226             24G     0   24G   0% 
/var/tmp/testdir36226/testfs2.36226
+   testpool.36226/testfs.36226/testfs2.36226.unmounted   24G     0   24G   0% 
/var/tmp/testdir36226/testfs2.36226.unmounted
+   testpool.36226/testfs.36226/unshared                  24G     0   24G   0% 
/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
+   
--------------------------------------------------------------------------------
+ 
+   tcp6       0      0 :::9999                 :::*                    LISTEN  
    21955/nbd-server
+   mount on /dev/nbd0 failed
+   disconnect, sock, done
+   stderr:
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
+          missing codepage or helper program, or other error
+ 
+          In some cases useful info is found in syslog - try
+          dmesg | tail or so.
+   umount: /mnt/nbd-test-21931: not mounted
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-140-generic 4.4.0-140.166
  ProcVersionSignature: Ubuntu 4.4.0-140.166-generic 4.4.162
  Uname: Linux 4.4.0-140-generic s390x
  NonfreeKernelModules: lttng_probe_writeback lttng_probe_workqueue 
lttng_probe_vmscan lttng_probe_udp lttng_probe_timer lttng_probe_sunrpc 
lttng_probe_statedump lttng_probe_sock lttng_probe_skb lttng_probe_signal 
lttng_probe_scsi lttng_probe_sched lttng_probe_rcu lttng_probe_random 
lttng_probe_printk lttng_probe_power lttng_probe_net lttng_probe_napi 
lttng_probe_module lttng_probe_kvm lttng_probe_kmem lttng_probe_jbd2 
lttng_probe_irq lttng_probe_compaction lttng_probe_block 
lttng_ring_buffer_metadata_mmap_client lttng_ring_buffer_client_mmap_overwrite 
lttng_ring_buffer_client_mmap_discard lttng_ring_buffer_metadata_client 
lttng_ring_buffer_client_overwrite lttng_ring_buffer_client_discard 
lttng_tracer lttng_statedump lttng_ftrace lttng_kprobes lttng_clock 
lttng_lib_ring_buffer lttng_kretprobes 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.
  CurrentDmesg:
-  
+ 
  Date: Fri Nov 30 05:07:39 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-4.4.0-140-generic N/A
-  linux-backports-modules-4.4.0-140-generic  N/A
-  linux-firmware                             1.157.21
+  linux-restricted-modules-4.4.0-140-generic N/A
+  linux-backports-modules-4.4.0-140-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)

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

-- 
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https://bugs.launchpad.net/bugs/1806013

Title:
  ubuntu_nbd_smoke_test failed when running with the smoke test suite on
  X 4.4 s390x zVM

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  New

Bug description:
  This test can pass if you run it manually on s390x zVM.

  But it will fail when you try to run it with the smoke test suite on
  jenkins.

  And this issue was only spotted on this s390x zVM (kernel01)

    
--------------------------------------------------------------------------------
    Image path:    /tmp/nbd_image.img
    Mount point:   /mnt/nbd-test-21931
    Date:          Fri Nov 30 03:13:05 EST 2018
    Host:          kernel01
    Kernel:        4.4.0-140-generic #166-Ubuntu SMP Wed Nov 14 20:08:28 UTC 
2018
    Machine:       kernel01 s390x s390x
    CPUs online:   8
    CPUs total:    8
    Page size:     4096
    Pages avail:   636227
    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  5.1G  1.2G  82% /
    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  1.8G   18G  10% 
/home
    testpool.36226                                        24G     0   24G   0% 
/testpool.36226
    testpool.36226/testfs.36226                           24G  128K   24G   1% 
/var/tmp/testdir36226
    testpool.36226/testfs.36226/clone                     24G     0   24G   0% 
/var/tmp/testdir36226/clone
    testpool.36226/testfs.36226/renameme                  24G     0   24G   0% 
/var/tmp/testdir36226/renameme
    testpool.36226/testfs.36226/shared                    24G     0   24G   0% 
/var/tmp/testdir36226/shared
    testpool.36226/testfs.36226/testfs2.36226             24G     0   24G   0% 
/var/tmp/testdir36226/testfs2.36226
    testpool.36226/testfs.36226/testfs2.36226.unmounted   24G     0   24G   0% 
/var/tmp/testdir36226/testfs2.36226.unmounted
    testpool.36226/testfs.36226/unshared                  24G     0   24G   0% 
/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
    
--------------------------------------------------------------------------------

    tcp6       0      0 :::9999                 :::*                    LISTEN  
    21955/nbd-server
    mount on /dev/nbd0 failed
    disconnect, sock, done
    stderr:
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    mount: wrong fs type, bad option, bad superblock on /dev/nbd0,
           missing codepage or helper program, or other error

           In some cases useful info is found in syslog - try
           dmesg | tail or so.
    umount: /mnt/nbd-test-21931: not mounted

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-140-generic 4.4.0-140.166
  ProcVersionSignature: Ubuntu 4.4.0-140.166-generic 4.4.162
  Uname: Linux 4.4.0-140-generic s390x
  NonfreeKernelModules: lttng_probe_writeback lttng_probe_workqueue 
lttng_probe_vmscan lttng_probe_udp lttng_probe_timer lttng_probe_sunrpc 
lttng_probe_statedump lttng_probe_sock lttng_probe_skb lttng_probe_signal 
lttng_probe_scsi lttng_probe_sched lttng_probe_rcu lttng_probe_random 
lttng_probe_printk lttng_probe_power lttng_probe_net lttng_probe_napi 
lttng_probe_module lttng_probe_kvm lttng_probe_kmem lttng_probe_jbd2 
lttng_probe_irq lttng_probe_compaction lttng_probe_block 
lttng_ring_buffer_metadata_mmap_client lttng_ring_buffer_client_mmap_overwrite 
lttng_ring_buffer_client_mmap_discard lttng_ring_buffer_metadata_client 
lttng_ring_buffer_client_overwrite lttng_ring_buffer_client_discard 
lttng_tracer lttng_statedump lttng_ftrace lttng_kprobes lttng_clock 
lttng_lib_ring_buffer lttng_kretprobes 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.
  CurrentDmesg:

  Date: Fri Nov 30 05:07:39 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-4.4.0-140-generic N/A
   linux-backports-modules-4.4.0-140-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)

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