Fix for bug in qtdeclarative:
https://codereview.qt-project.org/#/c/161896/
** Also affects: qtdeclarative-opensource-src (Ubuntu)
Importance: Undecided
Status: New
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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:
In Progress
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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