Course sanity check with mainline kernels:

4.2 OK
4.3 hangs
4.4 hangs
4.5 hang
4.6 - 4.8 no hang, but dumps message (see below)
4.9 OK

Oct  8 11:04:03 ubuntu kernel: [   31.788232] block nbd0: NBD_DISCONNECT
Oct  8 11:04:03 ubuntu kernel: [   31.788286] block nbd0: shutting down socket
Oct  8 11:04:03 ubuntu kernel: [   31.788290] ------------[ cut here 
]------------
Oct  8 11:04:03 ubuntu kernel: [   31.788299] WARNING: CPU: 0 PID: 1807 at 
/home/kernel/COD/linux/kernel/softirq.c:150 __local_bh_enable_ip+0x6b/0x80
Oct  8 11:04:03 ubuntu kernel: [   31.788301] Modules linked in: squashfs loop 
fuse nbd nls_iso8859_1 vfat fat snd_hda_codec_generic snd_hda_intel 
snd_hda_codec ppdev snd_hda_core virtio_console snd_hwdep virtio_balloon 
snd_pcm joydev input_leds efi_pstore led_class snd_timer efivars serio_raw snd 
i2c_piix4 soundcore acpi_cpufreq parport_pc 8250_fintek processor parport 
qemu_fw_cfg mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr 
configfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi efivarfs autofs4 
ext4 crc16 jbd2 mbcache btrfs raid10 raid456 async_raid6_recov async_memcpy 
async_pq async_xor async_tx xor hid_generic usbhid hid raid6_pq libcrc32c 
crc32c_generic raid1 raid0 multipath linear md_mod ata_generic virtio_net 
virtio_blk pata_acpi qxl ttm drm_kms_helper syscopyarea crct10dif_pclmul 
crc32_pclmul sysfillrect sysimgblt crc32c_intel fb_sys_fops ghash_clmulni_intel 
drm ata_piix intel_agp libata aesni_intel intel_gtt aes_x86_64 lrw gf128mul 
glue_helper uhci_hcd ablk_helper ehci_pci cryptd ehci_hcd agpgart scsi_mod 
virtio_pci psmouse usbcore virtio_ring virtio usb_common floppy button
Oct  8 11:04:03 ubuntu kernel: [   31.788400] CPU: 0 PID: 1807 Comm: nbd-client 
Not tainted 4.6.0-040600-generic #201606100558
Oct  8 11:04:03 ubuntu kernel: [   31.788402] Hardware name: QEMU Standard PC 
(i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
Oct  8 11:04:03 ubuntu kernel: [   31.788404]  0000000000000086 
0000000047e82912 ffff88039807faa8 ffffffff8135f483
Oct  8 11:04:03 ubuntu kernel: [   31.788409]  0000000000000000 
0000000000000000 ffff88039807fae8 ffffffff810814db
Oct  8 11:04:03 ubuntu kernel: [   31.788412]  0000009647e82912 
0000000000000200 ffff8803987d8840 ffff880393e74070
Oct  8 11:04:03 ubuntu kernel: [   31.788416] Call Trace:
Oct  8 11:04:03 ubuntu kernel: [   31.788445]  [<ffffffff8135f483>] 
dump_stack+0x63/0x90
Oct  8 11:04:03 ubuntu kernel: [   31.788448]  [<ffffffff810814db>] 
__warn+0xcb/0xf0
Oct  8 11:04:03 ubuntu kernel: [   31.788451]  [<ffffffff8108160d>] 
warn_slowpath_null+0x1d/0x20
Oct  8 11:04:03 ubuntu kernel: [   31.788455]  [<ffffffff81086bfb>] 
__local_bh_enable_ip+0x6b/0x80
Oct  8 11:04:03 ubuntu kernel: [   31.788461]  [<ffffffff81579217>] 
lock_sock_nested+0x57/0x70
Oct  8 11:04:03 ubuntu kernel: [   31.788471]  [<ffffffff8160e50b>] 
inet_shutdown+0x3b/0x110
Oct  8 11:04:03 ubuntu kernel: [   31.788474]  [<ffffffff815738a0>] 
kernel_sock_shutdown+0x10/0x20
Oct  8 11:04:03 ubuntu kernel: [   31.788481]  [<ffffffffc064ae6a>] 
sock_shutdown+0x4a/0xa0 [nbd]
Oct  8 11:04:03 ubuntu kernel: [   31.788486]  [<ffffffffc064b4d5>] 
__nbd_ioctl+0x615/0xb70 [nbd]
Oct  8 11:04:03 ubuntu kernel: [   31.788492]  [<ffffffff810b537a>] ? 
select_idle_sibling+0x2a/0x120
Oct  8 11:04:03 ubuntu kernel: [   31.788497]  [<ffffffff810b65db>] ? 
select_task_rq_fair+0x61b/0x730
Oct  8 11:04:03 ubuntu kernel: [   31.788504]  [<ffffffff810ad297>] ? 
try_to_wake_up+0x47/0x3c0
Oct  8 11:04:03 ubuntu kernel: [   31.788507]  [<ffffffff810ad6b2>] ? 
default_wake_function+0x12/0x20
Oct  8 11:04:03 ubuntu kernel: [   31.788519]  [<ffffffff812375b3>] ? 
pollwake+0x73/0x90
Oct  8 11:04:03 ubuntu kernel: [   31.788526]  [<ffffffff810ad6a0>] ? 
wake_up_q+0x70/0x70
Oct  8 11:04:03 ubuntu kernel: [   31.788532]  [<ffffffff810c5372>] ? 
__wake_up_common+0x52/0x90
Oct  8 11:04:03 ubuntu kernel: [   31.788541]  [<ffffffff810ee653>] ? 
current_fs_time+0x23/0x30
Oct  8 11:04:03 ubuntu kernel: [   31.788546]  [<ffffffff812c6168>] ? 
security_capable+0x48/0x60
Oct  8 11:04:03 ubuntu kernel: [   31.788550]  [<ffffffffc064ba8d>] 
nbd_ioctl+0x5d/0x7d [nbd]
Oct  8 11:04:03 ubuntu kernel: [   31.788557]  [<ffffffff8133d964>] 
blkdev_ioctl+0x274/0x920
Oct  8 11:04:03 ubuntu kernel: [   31.788564]  [<ffffffff81221b49>] ? 
__vfs_write+0xc9/0x120
Oct  8 11:04:03 ubuntu kernel: [   31.788574]  [<ffffffff8125e3ad>] 
block_ioctl+0x3d/0x50
Oct  8 11:04:03 ubuntu kernel: [   31.788577]  [<ffffffff81236531>] 
do_vfs_ioctl+0xa1/0x5b0
Oct  8 11:04:03 ubuntu kernel: [   31.788582]  [<ffffffff81222489>] ? 
vfs_write+0x149/0x1a0
Oct  8 11:04:03 ubuntu kernel: [   31.788585]  [<ffffffff81236ab9>] 
SyS_ioctl+0x79/0x90
Oct  8 11:04:03 ubuntu kernel: [   31.788601]  [<ffffffff816a09b6>] 
entry_SYSCALL_64_fastpath+0x1e/0xa8
Oct  8 11:04:03 ubuntu kernel: [   31.788605] ---[ end trace 017ff4e61fb69ab3 
]---
Oct  8 11:04:03 ubuntu kernel: [   31.788687] block nbd0: Receive control 
failed (result -32)
Oct  8 11:04:05 ubuntu kernel: [   33.299189] nbd: unregistered device at major 
43

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1793464

Title:
  Kernel panic after the ubuntu_nbd_smoke_test on Xenial kernel

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

Bug description:
  This issue can be reproduced on AMD64 KVM //bare-metal node, s390x
  zKVM node

  The test itself will pass, but the system will hang after a few
  second.

  Steps:
    1. Deploy a node with 4.4 Xenial
    2. Run the ubuntu_nbd_smoke_test

  If you have access to the console, you will see that this system
  actually bumped into a kernel panic:

   Unable to handle kernel pointer dereference in virtual kernel address space
   failing address: 000003ff802c1000 TEID: 000003ff802c1803
   Fault in home space mode while using kernel ASCE.
   Log here (s390x KVM): https://pastebin.ubuntu.com/p/dNmtvbGjmz/

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-136-generic 4.4.0-136.162
  ProcVersionSignature: Ubuntu 4.4.0-136.162-generic 4.4.144
  Uname: Linux 4.4.0-136-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: Thu Sep 20 03:46:00 2018
  HibernationDevice: RESUME=UUID=ca468a9c-9563-442c-85c6-6055e800a66e
  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=b65b756a-ba4e-4c53-aa32-0db2bdb50bb3 
crashkernel=196M
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-136-generic N/A
   linux-backports-modules-4.4.0-136-generic  N/A
   linux-firmware                             1.157.20
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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