[TOPBLOCKER] unity8 crashing a lot since image #126

[Brendan Donegan]

Since RTM image #126 was released on friday, most users have been reporting frequent unity8 crashes. Some scenarios where this commonly happen appear to be:

- Unlocking SIM cards for the first time
- Tapping on snap notifications when receiving an SMS

A lot of crashes are also observed during automated image testing.

ProblemType: Bug
DistroRelease: Ubuntu RTM 14.09
Package: unity8 8.00+14.10.20141017-0ubuntu1 [origin: unknown]
Uname: Linux 3.4.67 armv7l
ApportVersion: 2.14.7-0ubuntu8
Architecture: armhf
Date: Tue Oct 28 17:20:40 2014
InstallationDate: Installed on 2014-10-28 (0 days ago)
InstallationMedia: Ubuntu Utopic Unicorn (development branch) - armhf (20141028-030205)
SourcePackage: unity8
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[John McAleely (john.mcaleely)]

Commentary had started in bug #1386324, but this should be a public bug. All of the logs/comments can be cross posted if that is necessary - there's nothing confidential there.

[kevin gunn (kgunn72)]

Based on some discussion....seems this may be related to
bug 1382595

there was a media-hub landing on friday which fixed "2nd play of video capability" which in theory would mean more chances for hitting dead objects on the bus

And b/c this bug has the same signature expected / seen in bug 1382595 based on feedback from ogra ( https://errors.ubuntu.com/oops/3f6b473c-5e83-11e4-a8bb-fa163e373683 )

The branches for those are currently in silo ubuntu-rtm/landing-013, as soon as there's packages available it would be good to help test and see if this makes the problem disappear

[kevin gunn (kgunn72)]

regarding media-hub landing on friday, that was when image #126 was produced and the various testers began to witness unity8 crashing "frequently"

[kevin gunn (kgunn72)]

so the root cause of the media-hub issues is thot to be that notifications is a client of media hub (so lots of create/destroy) which in turn leaves dead objs on dbus which results in the mutex lock signature seen in comment #4.
There is a fix for this, branches linked.
It is currently attempting to land in rtm silo 13

[Brendan Donegan (brendan-donegan)]

I've just been testing silo 13 - it makes the crashes go away but after enabling flight mode I can't disable it. The fix might need a bit of tweaking.

[kevin gunn (kgunn72)]

Confirmed by QA that silo13 fixes the crashiness

[Launchpad Janitor (janitor)]

This bug was fixed in the package media-hub - 2.0.0+14.10.20141030~rtm-0ubuntu1

---------------
media-hub (2.0.0+14.10.20141030~rtm-0ubuntu1) 14.09; urgency=low

  [ thomas-voss ]
  * Bump build dependency. (LP: #1386803)
 -- Ubuntu daily release <email address hidden> Thu, 30 Oct 2014 14:29:53 +0000

[Launchpad Janitor (janitor)]

This bug was fixed in the package qtubuntu-media - 0.7.1+14.10.20141031~rtm-0ubuntu1

---------------
qtubuntu-media (0.7.1+14.10.20141031~rtm-0ubuntu1) 14.09; urgency=low

  [ thomas-voss ]
  * Cut event connections on destruction. (LP: #1386803)
 -- Ubuntu daily release <email address hidden> Fri, 31 Oct 2014 13:13:47 +0000

[Launchpad Janitor (janitor)]

This bug was fixed in the package qtubuntu-media - 0.7.1+15.04.20141104-0ubuntu1

---------------
qtubuntu-media (0.7.1+15.04.20141104-0ubuntu1) vivid; urgency=low

  * New rebuild forced

qtubuntu-media (0.7.1+14.10.20141031~rtm-0ubuntu1) 14.09; urgency=low

  [ thomas-voss ]
  * Cut event connections on destruction. (LP: #1386803)

qtubuntu-media (0.7.1+14.10.20141022~rtm-0ubuntu1) 14.09; urgency=low

  [ Jim Hodapp ]
  * Add simple support for Orientation Property changed signal that
    comes from media-hub. Pass the video frame dimension in from media-
    hub through to qtvideo-node (LP: #1191934)

qtubuntu-media (0.7.1+14.10.20141015.1~rtm-0ubuntu1) 14.09; urgency=low

  [ thomas-voss ]
  * Make sure that invocations on probably deleted objects in async
    callbacks are guarded. Condense creation/deletion of controls in one
    place. (LP: #1376467)
 -- Ubuntu daily release <email address hidden> Tue, 04 Nov 2014 05:40:48 +0000

[Launchpad Janitor (janitor)]

This bug was fixed in the package media-hub - 2.0.0+15.04.20141105-0ubuntu1

---------------
media-hub (2.0.0+15.04.20141105-0ubuntu1) vivid; urgency=low

  [ thomas-voss ]
  * Disconnect signal translation layer on destruction. (LP: #1386803)
 -- Ubuntu daily release <email address hidden> Wed, 05 Nov 2014 08:24:08 +0000