dx-packages team mailing list archive

[James Hunt <1357252@xxxxxxxxxxxxxxxxxx>]

After a lot of testing, I think I've found the cause - when lightdm
starts the session init, logind is supposed to setup the cgroups.  But
that isn't happening.

Normally, logind would do that by asking systemd, but in our case it
talks to systemd-shim. sytemd-shim then asks cgmanager to create the
cgroups.  However, currently systemd-shim does not fail if cgmanager
cannot be contacted.  So I think the proper fix is to change systemd-
shim to either block or fail hard if cgmanager is not contactable or
unable to create the requested cgroups. It would also be beneficial to
arrange for systemd-shim output to be captured since currently all
stdout and stderr is discarded when it is run via /usr/share/dbus-1
/system-services/org.freedesktop.systemd1.service.

A "quick fix" however is to change dbus's 'start on' condition to ensure
it doesn't start until cgmanager is ready. The simplest fix being:

$ echo "start on cgmanager-ready" | sudo tee -a /etc/init/dbus.override

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https://bugs.launchpad.net/bugs/1357252

Title:
  Upstart jobs specifying cgroup fail to start occasionally

Status in Ubuntu Application Launcher:
  Incomplete
Status in Upstart:
  Invalid
Status in “cgmanager” package in Ubuntu:
  Confirmed
Status in “systemd-shim” package in Ubuntu:
  New

Bug description:
  After the ubuntu-app-launch landing in #188
  (http://people.canonical.com/~ogra/touch-image-stats/188.changes), UI
  Toolkit autopilot tests have started failing, see
  http://ci.ubuntu.com/smokeng/utopic/touch/mako/190:20140815:20140811.1/9676/ubuntuuitoolkit/
  and the #188 results too. It's different tests each time, but a bit
  above 10 of them tend to fail on each full run.

  Reproducable locally, where I got 11 such failures.

  To reproduce:
  [terminal 1]
  1. flash/update device if needed
  2. adb shell
  3. apt install ubuntu-ui-toolkit-autopilot
  4. powerd-cli display on bright # leave running, also unlock the screen so that lenses are shown
  [terminal 2]
  5. phablet-config autopilot --dbus-probe enable # wait until finishes
  6. phablet-test-run ubuntuuitoolkit

  A full test suite run will take around 0.5h and should produce a bunch
  of 'Application failed to start.':s.

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