[Bug 1776616] Re: Ubuntu 18.04 getting stuck at "Starting Reboot" and "Starting Power-Off"

Hi.

Thanks for trying to help, but unfortunately I can't test that at this
time since I'm not that experienced and i can't take the risk of ruining
this installation. Sorry.

On my computer the transition from 4.5.7 to 4.6.0 is the cause of this
bug.

Toshiba A210 with AMD CPU and graphics.

4.5.7 - Works

4.6.0 - Doesn't work

Can anyone try to install the following kernels to check if the same
behavior happens on other computers?

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.5.7-yakkety/

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc1-wily/

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https://bugs.launchpad.net/bugs/1776616

Title:
Ubuntu 18.04 getting stuck at "Starting Reboot" and "Starting Power-
Off"

Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
Confirmed

Bug description:
Hardware: HPE ProLiant DL360 gen9
Ubuntu Version: 18.04

Problem: When rebooting the server, everything goes well (shutting
down services, unmounting etc) until the last step where it reads
"Starting Reboot". At this point the system is getting stuck and
nothing else can can be done than holding the power button in for a
long enough time to turn it off. At the same time as the system get
stuck, a red error light is lightening up on the server. This light is
green until it reaches this "Starting Reboot" stage. The same happens
if the server is shutdown, with the difference that the last message
is "Starting Power-Off" instead of "Starting Reboot".

The server is installed with a new clean 18.04 installation. This
server was rebooting/shutting down without a problem with all releases
between 16.04 and 17.10.

This problem is serious as it prevents remote reboot.
---
ProblemType: Bug
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jun 13 11:16 seq
crw-rw---- 1 root audio 116, 33 Jun 13 11:16 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 18.04
HibernationDevice: RESUME=none
MachineType: HP ProLiant DL360 Gen9
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
Package: linux (not installed)
PciMultimedia:

ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 mgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/ROOT/ubuntu@/boot/vmlinuz-4.15.0-23-generic root=ZFS=rpool/ROOT/ubuntu ro
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-23-generic N/A
linux-backports-modules-4.15.0-23-generic N/A
linux-firmware 1.173.1
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
Tags: bionic
Uname: Linux 4.15.0-23-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

_MarkForUpload: True
dmi.bios.date: 05/21/2018
dmi.bios.vendor: HP
dmi.bios.version: P89
dmi.board.name: ProLiant DL360 Gen9
dmi.board.vendor: HP
dmi.chassis.type: 23
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnHP:bvrP89:bd05/21/2018:svnHP:pnProLiantDL360Gen9:pvr:rvnHP:rnProLiantDL360Gen9:rvr:cvnHP:ct23:cvr:
dmi.product.family: ProLiant
dmi.product.name: ProLiant DL360 Gen9
dmi.sys.vendor: HP

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