[Bug 1720397] Re: qemu-kvm doesnt restart after node reboot

Mon Oct 16 14:36:32 UTC 2017

I was testing the fix from a ppa:

With debug enabled this looks much better now.

Install:

Setting up qemu-system-common (1:2.10+dfsg-0ubuntu3~ppa2) ...
(deb-systemd-helper DEBUG) is purge = no
(deb-systemd-helper DEBUG) action = unmask, scriptname = qemu-kvm.service, service_path = /lib/systemd/system/qemu-kvm.service
(deb-systemd-helper DEBUG) rmdir_if_empty /var/lib/systemd/deb-systemd-helper-masked
(deb-systemd-helper DEBUG) rmdir(/var/lib/systemd/deb-systemd-helper-masked) failed (No such file or directory)
(deb-systemd-helper DEBUG) is purge = no
(deb-systemd-helper DEBUG) action = was-enabled, scriptname = qemu-kvm.service, service_path = /lib/systemd/system/qemu-kvm.service
(deb-systemd-helper DEBUG) Reading state file /var/lib/systemd/deb-systemd-helper-enabled/qemu-kvm.service.dsh-also
(deb-systemd-helper DEBUG) Contents: $VAR1 = [];

(deb-systemd-helper DEBUG) All links present, considering qemu-kvm.service was-enabled.
(deb-systemd-helper DEBUG) is purge = no
(deb-systemd-helper DEBUG) action = enable, scriptname = qemu-kvm.service, service_path = /lib/systemd/system/qemu-kvm.service
(deb-systemd-helper DEBUG) Using systemctl preset to enable qemu-kvm.service
Created symlink /etc/systemd/system/multi-user.target.wants/qemu-kvm.service → /lib/systemd/system/qemu-kvm.service.
(deb-systemd-helper DEBUG) Renaming temp file /var/lib/systemd/deb-systemd-helper-enabled/.stateJvURx.tmp to state file /var/lib/systemd/deb-systemd-helper-enabled/qemu-kvm.service.dsh-also
● qemu-kvm.service - QEMU KVM preparation - module, ksm, hugepages
   Loaded: loaded (/lib/systemd/system/qemu-kvm.service; enabled; vendor preset: enabled)
   Active: active (exited) since Mon 2017-10-16 14:27:33 UTC; 1s ago
  Process: 4559 ExecStart=/usr/share/qemu/init/qemu-kvm-init start (code=exited, status=0/SUCCESS)
 Main PID: 4559 (code=exited, status=0/SUCCESS)
      CPU: 4ms

Oct 16 14:27:33 artful-test-qemukvm systemd[1]: Starting QEMU KVM preparation - module, ksm, hugepages...
Oct 16 14:27:33 artful-test-qemukvm systemd[1]: Started QEMU KVM preparation - module, ksm, hugepages.

More critical - upgrade on a system that was formerly in the broken state (all since zesty and artful so far).

[...]
Setting up qemu-system-common (1:2.10+dfsg-0ubuntu2) ...
● qemu-kvm.service - QEMU KVM preparation - module, ksm, hugepages
   Loaded: loaded (/lib/systemd/system/qemu-kvm.service; disabled; vendor preset: enabled)
   Active: inactive (dead)
# _DEB_SYSTEMD_HELPER_DEBUG=1 apt install -y qemu-system-common; systemctl status qemu-kvmReading package lists... Done
Building dependency tree       
Reading state information... Done
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'apt autoremove' to remove it.
The following additional packages will be installed:
  qemu-block-extra
The following packages will be upgraded:
  qemu-block-extra qemu-system-common
2 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
Need to get 441 kB of archives.
After this operation, 2048 B of additional disk space will be used.
Get:1 http://ppa.launchpad.net/ci-train-ppa-service/2992/ubuntu artful/main amd64 qemu-system-common amd64 1:2.10+dfsg-0ubuntu3~ppa2 [401 kB]
Get:2 http://ppa.launchpad.net/ci-train-ppa-service/2992/ubuntu artful/main amd64 qemu-block-extra amd64 1:2.10+dfsg-0ubuntu3~ppa2 [40.0 kB]
Fetched 441 kB in 1s (342 kB/s)           
(Reading database ... 26809 files and directories currently installed.)
Preparing to unpack .../qemu-system-common_1%3a2.10+dfsg-0ubuntu3~ppa2_amd64.deb ...
Unpacking qemu-system-common (1:2.10+dfsg-0ubuntu3~ppa2) over (1:2.10+dfsg-0ubuntu2) ...
Preparing to unpack .../qemu-block-extra_1%3a2.10+dfsg-0ubuntu3~ppa2_amd64.deb ...
Unpacking qemu-block-extra:amd64 (1:2.10+dfsg-0ubuntu3~ppa2) over (1:2.10+dfsg-0ubuntu2) ...
Setting up qemu-block-extra:amd64 (1:2.10+dfsg-0ubuntu3~ppa2) ...
Processing triggers for man-db (2.7.6.1-2) ...
Setting up qemu-system-common (1:2.10+dfsg-0ubuntu3~ppa2) ...
(deb-systemd-helper DEBUG) is purge = no
(deb-systemd-helper DEBUG) action = unmask, scriptname = qemu-kvm.service, service_path = /lib/systemd/system/qemu-kvm.service
(deb-systemd-helper DEBUG) rmdir_if_empty /var/lib/systemd/deb-systemd-helper-masked
(deb-systemd-helper DEBUG) rmdir(/var/lib/systemd/deb-systemd-helper-masked) failed (No such file or directory)
(deb-systemd-helper DEBUG) is purge = no
(deb-systemd-helper DEBUG) action = was-enabled, scriptname = qemu-kvm.service, service_path = /lib/systemd/system/qemu-kvm.service
(deb-systemd-helper DEBUG) Reading state file /var/lib/systemd/deb-systemd-helper-enabled/qemu-kvm.service.dsh-also
(deb-systemd-helper DEBUG) Contents: $VAR1 = [];

(deb-systemd-helper DEBUG) All links present, considering qemu-kvm.service was-enabled.
(deb-systemd-helper DEBUG) is purge = no
(deb-systemd-helper DEBUG) action = enable, scriptname = qemu-kvm.service, service_path = /lib/systemd/system/qemu-kvm.service
(deb-systemd-helper DEBUG) Using systemctl preset to enable qemu-kvm.service
Created symlink /etc/systemd/system/multi-user.target.wants/qemu-kvm.service → /lib/systemd/system/qemu-kvm.service.
(deb-systemd-helper DEBUG) Renaming temp file /var/lib/systemd/deb-systemd-helper-enabled/.statesHxaw.tmp to state file /var/lib/systemd/deb-systemd-helper-enabled/qemu-kvm.service.dsh-also
● qemu-kvm.service - QEMU KVM preparation - module, ksm, hugepages
   Loaded: loaded (/lib/systemd/system/qemu-kvm.service; enabled; vendor preset: enabled)
   Active: active (exited) since Mon 2017-10-16 14:31:24 UTC; 1s ago
  Process: 6891 ExecStart=/usr/share/qemu/init/qemu-kvm-init start (code=exited, status=0/SUCCESS)
 Main PID: 6891 (code=exited, status=0/SUCCESS)
      CPU: 3ms

Oct 16 14:31:24 artful-test-qemukvm systemd[1]: Starting QEMU KVM preparation - module, ksm, hugepages...
Oct 16 14:31:24 artful-test-qemukvm systemd[1]: Started QEMU KVM preparation - module, ksm, hugepages.

Starting as well as it should.
Finally if one masked the service is shall stay masked and that worked as well.

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https://bugs.launchpad.net/bugs/1720397

Title:
  qemu-kvm doesnt restart after node reboot

Status in Ubuntu Cloud Archive:
  New
Status in qemu package in Ubuntu:
  In Progress
Status in qemu source package in Zesty:
  Confirmed
Status in qemu source package in Artful:
  In Progress

Bug description:
  [Impact]

   * Since the Zesty Merge the qemu-kvm service fails to be active by 
     default.

   * It is a non required but rather useful helper, so it should be fixed to 
     be enabled as it was pre zesty due to systemd-generators taking it from 
     sysv scripts back then.

  [Test Case]

   * Install qemu-system-common
   * Then check
     $ systemctl status qemu-kvm
   * This should be active (exited) but is currently disabled

  [Regression Potential]

   * If this script causes any issue for someone (not known so far) and he 
     was running on zesty a while it will on the SRU update be enabled and 
     trigger these issues. Yet this is a generic argument and if that would 
     be a blocker no services would be allowed to be enabled. I verified 
     that if masked the service stays off as it should.

  [Other Info]

   * IMO this issue qualified for  (2) the following of the Final Freeze:
     2) Bug fixes that would be suitable for post-release SRUs, which we
     may choose to accept, reject, or shunt to -updates for 0-day SRUs
     on a case-by-base basis.

  --

  Upon a MAAS reboot openstack nova-compute services come up blocked with the following message in juju status:

  Services not running that should be: qemu-kvm

  services qemu-kvm status shows the services as dead
  services qemu-kvm restart fixes issue.

  ubuntu at fair-dingo:~$ service qemu-kvm status
  ● qemu-kvm.service - QEMU KVM preparation - module, ksm, hugepages
     Loaded: loaded (/lib/systemd/system/qemu-kvm.service; disabled; vendor preset: enabled)
     Active: active (exited) since Thu 2017-09-28 19:54:17 UTC; 3min 20s ago
    Process: 33714 ExecStart=/usr/share/qemu/init/qemu-kvm-init start (code=exited, status=0/SUCCESS)
   Main PID: 33714 (code=exited, status=0/SUCCESS)

  Linux MaaS 4.4.0-96-generic #119-Ubuntu SMP Tue Sep 12 14:59:54 UTC
  2017 x86_64 x86_64 x86_64 GNU/Linux

  Juju 2.2.4-xenial-amd64

  openstack 3.12.0

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