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[Launchpad Bug Tracker <1588929@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unity8 - 8.12+16.10.20160617-0ubuntu1

---------------
unity8 (8.12+16.10.20160617-0ubuntu1) yakkety; urgency=medium

  [ Michael Terry ]
  * Do not create Label/Icon if we don't need it
  * Fix Z-ordering of prompt surfaces (LP: #1586219)
  * Drop bottom edge tutorials completely and small fixes for other
    edges. (LP: #1565103)
  * Redo visuals for greeter prompt box. (LP: #1435923)
  * Make tutorial qmltests more robust. (LP: #1590810)
  * Stop showing an extra lockscreen in desktop unity8 sessions. (LP:
    #1582987)

  [ Albert Astals Cid ]
  * Improve dash plugin mock
  * Stabilize PreviewExpandableTest::test_all_widgets_height
  * Workaround QTBUG-53460
  * Split artShape code for cardTool card and regular card
  * Simplify the code since fixedArtSize code is mandatory for regular
    cards
  * Desktop stage: Support rotatesWindowContents (LP: #1547481)
  * Turn if if else into if elseif else
  * Fix leaks in QInputDeviceManagerPrivate::addDevice
  * Do not call |= on uninitialized sigterm.sa_flags
  * initialize udevMonitor
  * Make notifier and notifierFd function local variables
  * Fix crash if a component that is not an Item is given to
    sectionDelegate
  * Tests: Do not use dynamic_cast if we're not going to test it anyway
  * Minor coverity fixes
  * Fix warning about anchors.fill in ProportionalShape (LP: #1590963)
  * Make wait in cleanup() wait for snapTo animation to have finished

  [ Alexandros Frantzis ]
  * Improve the way notifications interact with power management (LP:
    #1570922)

  [ Andrea Cimitan ]
  * Correctly refresh cardcreator cache on artshapestyle changes (LP:
    #1588335)
  * Same tweaks we have for click scope now for libertine
  * add a timer to pull to refresh to work on small windows (LP:
    #1589060)

  [ Daniel d'Andrada ]
  * Clean up debug leftovers
  * Ensure mouse and window movement are pixel-aligned (LP: #1510382)
  * Fix SpreadDelegate rotation animations
  * No point in version-controlling files that are automatically
    generated
  * Center cursor on screen when it's first shown
  * Custom cursor name just have to start with "custom"
  * Work around AnimatedSprite infinite loop bug (LP: #1588929)

  [ Josh Arenson ]
  * Disable showDash when it is already shown. (LP: #1506708)
  * Add a timestamp to the dash log (LP: #1580074)
  * Add timestamp to unity8 log (LP: #1498169)

  [ Lukáš Tinkl ]
  * Implement keyboard shortcuts info panel
  * Implement window controls overlay activatable with 3 fingers tap
    (LP: #1489020)
  * Select correct Chinese input method for OSK in the wizard (LP:
    #1588633)

  [ Michael Zanetti ]
  * Add support for the launcher surface pips displaying the correct
    number of surfaces
  * Add support for the persistent alert state. (LP: #1575147, #1584348,
    #1586621)
  * send a Alt-release event on alt+tab instead of delaying it
    completely and invoking it later (LP: #1565236)

  [ Stephen M. Webb ]
  * added a new upstart $SESSION for unity8-desktop-session (LP:
    #1376715)

 -- Michael Terry <michael.terry@xxxxxxxxxxxxx>  Fri, 17 Jun 2016
01:22:57 +0000

** Changed in: unity8 (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1588929

Title:
  cursor interactions cause lockup with pocket desktop

Status in Mir:
  Invalid
Status in QtMir:
  Invalid
Status in qtdeclarative-opensource-src package in Ubuntu:
  New
Status in unity8 package in Ubuntu:
  Fix Released

Bug description:
  To reproduce (seen on frieza):

  Connect a mouse to a pocket desktop setup.
  Launch a 'legacy' application, like gedit, in windowed mode. The problem is not seen with 'native' applications, it seems that the setting the custom cursor bitmap that Xmir does is the precipitating event for the problem.
  Rapidly move the cursor over the edge of the window to force rapid cursor transitions.
  After a while (usually between 30s-2 minutes of the rapid movement), the desktop will lock up.

  First noted on mir 0.23 testing (silo 69), but also seen with 0.22.1.

  USC is still alive, and doesn't look locked up. Unity8 is locked.

  Render logs from Qt for the last 2 frames (including the one that's locked)
  http://pastebin.ubuntu.com/16953202/

  BT of threads when attaching to unity8 when stuck:
  http://pastebin.ubuntu.com/16952340/
  note: it seems that thread 1 is the render loop, and thread 2 is the render thread. Thread 2 doesn't quite seem stuck (seems to be busy, and doesnt unblock), and thread 1 is stuck waiting for a response from thread 2

  If I disable the notification of the cursor change callback in mir (just commenting out here)
  http://bazaar.launchpad.net/~mir-team/mir/0.22/view/head:/src/server/scene/basic_surface.cpp#L693
  This breaks the cursor updating for Xmir apps, but averts the crash

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