This is simple to reproduce. The application has disappeared from the
screen but continues to run.
It looks like qtmir is closing the window (as requested) but no word
gets out to the actual process (ie. there is no session management).
I'm suspecting the Unity 8 lifecycle for desktops is not in place yet.
Here's a snippet from $HOME/.cahe/upstart/unity8.log.
[2017-03-20:19:34:52.953] qtmir.sessions: TaskController::onSessionStarting -
sessionName=sol^M
[2017-03-20:19:34:52.954] qtmir.applications:
Application["sol"]::setSession(session=qtmir::Session(0x4ecb3290))^M
[2017-03-20:19:34:53.457]
file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/1.3/Icon.qml:115:5:
QML Image: Cannot open: file:///home/stephenw/.face^M
[2017-03-20:19:34:57.992] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::MirSurface(type=normal,state=restored,size=(480,376),parentSurface=QObject(0x0))^M
[2017-03-20:19:34:58.015] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::registerView(268052752) after=1^M
[2017-03-20:19:34:58.032] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::setKeymap("us")^M
[2017-03-20:19:34:58.467] toplevelwindowmodel: prependSurface appId=sol
surface=qtmir::MirSurface(0x3c828f80), filling out placeholder. after:
(index=0,appId=sol,surface=0x3c828f80,id=11),(index=1,appId=unity8-dash,surface=0x225db2f0,id=4)^M
[2017-03-20:19:34:58.468] toplevelwindowmodel: setFocusedWindow(0x0)^M
[2017-03-20:19:34:58.499] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::setFocused(true)^M
[2017-03-20:19:34:58.514] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::setReady()^M
[2017-03-20:19:34:58.520] qtmir.applications:
Application["sol"]::setInternalState(state=Running)^M
[2017-03-20:19:34:58.537] toplevelwindowmodel:
setFocusedWindow(Window[0x28c28060, id=11,
MirSurface[0x3c828f80,"AisleRiot"]])^M
[2017-03-20:19:34:58.664] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::requestState(restored)^M
[2017-03-20:19:34:58.673] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::updateExposure(true)^M
[2017-03-20:19:35:19.651] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::MirSurface(type=menu,state=restored,size=(172,66),parentSurface=qtmir::MirSurface(0x3c828f80))^M
[2017-03-20:19:35:19.801] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::registerView(745266864) after=1^M
[2017-03-20:19:35:20.080] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::setFocused(false)^M
[2017-03-20:19:35:20.093] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::setFocused(true)^M
[2017-03-20:19:35:20.098] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::setReady()^M
[2017-03-20:19:35:20.123] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::updateExposure(true)^M
[2017-03-20:19:35:20.126] toplevelwindowmodel:
setFocusedWindow(Window[0x33e53dc0, id=12,
MirSurface[0x28beec90,"AisleRiot"]])^M
[2017-03-20:19:35:20.128] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::setKeymap("us")^M
[2017-03-20:19:35:23.549] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::setLive(false)^M
[2017-03-20:19:35:23.552] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::unregisterView(745266864) after=0 live=false^M
[2017-03-20:19:35:23.553] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::updateExposure(false)^M
[2017-03-20:19:35:23.555] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::setFocused(true)^M
[2017-03-20:19:35:23.622] toplevelwindowmodel:
setFocusedWindow(Window[0x28c28060, id=11, MirSurface[0x3c828f80,"Klondike"]])^M
[2017-03-20:19:35:23.625] qtmir.surfaces:
MirSurface[0x28beec90,"sol"]::~MirSurface() viewCount=0^M
[2017-03-20:19:35:23.684] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::MirSurface(type=dialog,state=restored,size=(468,353),parentSurface=qtmir::MirSurface(0x3c828f80))^M
[2017-03-20:19:35:23.711] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::registerView(744596304) after=1^M
[2017-03-20:19:35:23.893] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::setFocused(false)^M
[2017-03-20:19:35:23.904] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::setFocused(true)^M
[2017-03-20:19:35:23.911] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::setReady()^M
[2017-03-20:19:35:23.921] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::updateExposure(true)^M
[2017-03-20:19:35:23.923] toplevelwindowmodel:
setFocusedWindow(Window[0x2e53a140, id=13, MirSurface[0x35577d70,"About
Aisleriot"]])^M
[2017-03-20:19:35:23.924] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::setKeymap("us")^M
[2017-03-20:19:35:26.995] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::activate()^M
[2017-03-20:19:35:57.911] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::close()^M
[2017-03-20:19:36:00.995] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::onCloseTimedOut()^M
[2017-03-20:19:36:01.013] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::setLive(false)^M
[2017-03-20:19:36:01.018] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::unregisterView(268052752) after=0 live=false^M
[2017-03-20:19:36:01.020] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::updateExposure(false)^M
[2017-03-20:19:36:01.025] qtmir.surfaces:
MirSurface[0x3c828f80,"sol"]::~MirSurface() viewCount=0^M
[2017-03-20:19:36:01.085] toplevelwindowmodel: removeAt after
(index=0,appId=unity8-dash,surface=0x225db2f0,id=4)^M
[2017-03-20:19:36:01.136] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::unregisterView(744596304) after=0 live=true^M
[2017-03-20:19:36:01.138] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::updateExposure(false)^M
[2017-03-20:19:37:16.440] qtmir.surfaces:
MirSurface[0x225db2f0,"unity8-dash"]::activate()^M
[2017-03-20:19:37:16.453] qtmir.surfaces:
MirSurface[0x35577d70,"sol"]::setFocused(false)^M
[2017-03-20:19:37:16.457] qtmir.surfaces:
MirSurface[0x225db2f0,"unity8-dash"]::setFocused(true)^M
[2017-03-20:19:37:16.485] toplevelwindowmodel:
setFocusedWindow(Window[0x336acfc0, id=4, MirSurface[0x225db2f0,"Scopes"]])^M
The process tree is still intact. Here's the relevant snippet from $(ps
-fax).
18164 ? Ss 0:00 \_ /usr/bin/python3 /usr/bin/libertine-launch
/usr/games/sol
18165 ? Sl 7:19 \_ Xmir -rootless -displayfd 3 -mir sol
18171 ? Sl 0:00 \_ pasted
18172 ? Sl 0:00 \_ /usr/games/sol
Using $(lsof) I can see that Xmir is still connected to the Unity 8
process over the Mir socket.
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1671731
Title:
[xmir] closing an app while a child window is opened leaves an Xmir
process opened eating 100% CPU
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https://bugs.launchpad.net/canonical-devices-system-image/+bug/1671731/+subscriptions
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