Qt 5.6 now in yakkety and xenial-overlay with largely re-engineered
QDBus (...with new but different bugs).

** Changed in: qtbase-opensource-src (Ubuntu)
       Status: Incomplete => Fix Released

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  unity8 sometimes hangs on boot

Status in Canonical System Image:
  Fix Released
Status in autopilot package in Ubuntu:
  Fix Released
Status in libusermetrics package in Ubuntu:
  Fix Released
Status in lxc-android-config package in Ubuntu:
Status in qtbase-opensource-src package in Ubuntu:
  Fix Released
Status in ubuntu-system-settings-online-accounts package in Ubuntu:
  Fix Released
Status in unity8 package in Ubuntu:

Bug description:
  The following gdbus call is failing with a "Error: Timeout was
  reached" message:

  gdbus call --session --dest com.canonical.UnityGreeter --object-path /
  --method org.freedesktop.DBus.Properties.Get
  com.canonical.UnityGreeter IsActive

  This is being seen on krillin devices starting with image 106 from
  ubuntu-touch/devel-proposed. It doesn't happen every time, so far
  today, I've seen it 3 times from about 12 tests. On the most recent
  failure, I grabbed a console and tried repeatedly to run the command
  from the shell, even after 2 hours the timeout was still being
  returned (after about 28 seconds).

  A copy of ~/.cache/upstart/unity8.log is here:

  I have 3 test cases where the problem was observed:

  In all cases, the test is using adt-run (from autopkgtest) to drive a
  test on the phone device. adt-run uses the above gdbus call to
  determine if the desktop is active. In all the examples, the device
  was freshly flashed.

  == Test Case ==

  # Prepare debugging
  adb shell
  sudo apt-get clean # so that you wouldn't run out of disk space
  sudo apt install qtbase5-dbg libc6-dbg libdbus-glib-1-2-dbg dbus-1-dbg 

  # Add also libusermetrics debug symbols, unless you're testing a PPA version
  echo "deb http://ddebs.ubuntu.com $(lsb_release -cs) main restricted universe 
multiverse" | sudo tee -a /etc/apt/sources.list.d/ddebs.list
  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 428D7C01
  sudo apt-get update
  sudo apt install libusermetricsoutput1-dbgsym=1.1.1+15.04.20150219-0ubuntu1

  # Start the reboot loop
  # This reboots the device in a loop, and if this bug is not fixed by whatever 
proposed solution, it will hang eventually with Unity 8 having a black 
background. Other kind of hangs (like just Google logo showing, no adb) are not 
related to this bug. Current highest amount of reboots without errors is 54, so 
it's probable a 100 reboots is needed for testing.

  bzr branch lp:unity8
  cd unity8
  while true; do adb shell rm -R "~phablet/.cache/QML"; ./tools/unlock-device 
|| break; done

  # When it fails
  adb shell
  sudo gdb -p $(pidof unity8)
  bt full

  At this point, the backtrace should show:
  #0  syscall () at ../sysdeps/unix/sysv/linux/arm/syscall.S:37
  #1  0xb6301e12 in _q_futex (op=0, val=3, timeout=0x0, addr=<optimized out>)
      at thread/qmutex_linux.cpp:146
  #2  lockInternal_helper<false> (timeout=-1, elapsedTimer=0x0, d_ptr=...)
      at thread/qmutex_linux.cpp:187
  #3  QBasicMutex::lockInternal (this=this@entry=0x1523b44)
      at thread/qmutex_linux.cpp:203
  #4  0xb6301eb6 in lock (this=0x1523b44) at thread/qmutex.h:59
  #5  lock (timeout=-1, this=0x1523b38) at thread/qmutex.cpp:620
  #6  QMutex::lock (this=this@entry=0x1523d6c) at thread/qmutex.cpp:215
  #7  0xb5f39586 in QDBusMutexLocker (m=0x1523d6c, s=0x1523d48,
      a=ToggleWatchAction, this=<synthetic pointer>) at qdbusthreaddebug_p.h:183
  #8  QDBusDispatchLocker (s=0x1523d48, a=ToggleWatchAction,
      this=<synthetic pointer>) at qdbusthreaddebug_p.h:198
  #9  qDBusRealToggleWatch (d=0x1523d48, watch=0x1524dd0, fd=46)
      at qdbusintegrator.cpp:346
  #10 0xb5ae18f6 in ?? () from /lib/arm-linux-gnueabihf/libdbus-1.so.3

  With this, it's know that it was a QDBus locking related problem.


  2015-02-20: libusermetrics lands, causing (apparently) this boot problem to 
start happening rarely. 
http://people.canonical.com/~ogra/touch-image-stats/106.changes / 
 ”I got a symbolic trace out of all the threads. It seems to be a dbus lock 
between usermetrics and networkmanager bits. We suspect a relation to QTBUG 
  2015-03-25: qtbase dbus update to support threads (instead of one main 
thread) in PPA 018 fixes the boot issue, but autopilot test suites start 
failing randomly.
  2015-03-27: an autopilot fix fixes a simple test case, and seems to fix UITK 
suite as a whole, but on krillin only
  2015-04-10: Further patches from upstream fix all AP tests.
  2015-04-23: Upstream continues to work on the patches but they have not yet 
been merged. AP:s pass, but U1 account gets removed usually after a reboot, 
even though apps can be installed after adding U1 account flawlessly for the 
duration of that boot.

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