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List: kde-panel-devel
Subject: Re: Review Request 123494: Create DesktopView before connecting signals from the activity consumer
From: "Bhushan Shah" <bhush94 () gmail ! com>
Date: 2015-04-25 14:09:24
Message-ID: 20150425140924.6982.80716 () mimi ! kde ! org
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This is an automatically generated e-mail. To reply, visit:
https://git.reviewboard.kde.org/r/123494/
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(Updated April 25, 2015, 2:09 p.m.)
Status
------
This change has been marked as submitted.
Review request for Plasma, Ivan Čukić and Marco Martin.
Changes
-------
Submitted with commit 317421fd23eabd17d84320a31552c40ccd45a778 by Bhushan Shah to \
branch master.
Repository: plasma-workspace
Description
-------
This avoids the crash situation where something have created the activity consumer \
earlier and currentActivityChanged signal is emitted before view is created.
```
#0 PlasmaQuick::View::setContainment (this=0x0, cont=0x16a9fc0) at \
/home/bshah/aur/plasma-framework-git/src/plasma-framework/src/plasmaquick/view.cpp:243
#1 0x0000000000462097 in StandaloneAppCorona::currentActivityChanged \
(this=0x7772a0, newActivity=...) at \
/home/bshah/aur/plasma-workspace-git/src/plasma-workspace/shell/standaloneappcorona.cpp:192
#2 0x00007ffff32383c9 in QMetaObject::activate(QObject*, int, int, void**) () from \
/usr/lib/libQt5Core.so.5 #3 0x00007ffff71f9763 in \
KActivities::Consumer::currentActivityChanged (this=0x741aa0, _t1=...) at \
/home/bshah/aur/kactivities-git/src/build/src/lib/core/moc_consumer.cpp:216 #4 \
0x00007ffff71f94dd in KActivities::Consumer::qt_static_metacall (_o=0x741aa0, \
_c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fffffffa570) at \
/home/bshah/aur/kactivities-git/src/build/src/lib/core/moc_consumer.cpp:103 #5 \
0x00007ffff32383c9 in QMetaObject::activate(QObject*, int, int, void**) () from \
/usr/lib/libQt5Core.so.5 #6 0x00007ffff71f91d6 in \
KActivities::ActivitiesCache::currentActivityChanged (this=0x77c900, _t1=...) at \
/home/bshah/aur/kactivities-git/src/build/src/lib/core/moc_activitiescache_p.cpp:353 \
#7 0x00007ffff71ee4f7 in KActivities::ActivitiesCache::setCurrentActivity \
(this=0x77c900, activity=...) at \
/home/bshah/aur/kactivities-git/src/kactivities/src/lib/core/activitiescache_p.cpp:297
```
I hit this crash when creating recent media backend for pmc. First backendsmodel is \
initalized which in turn loads the recentmedia backend and hence creates the activity \
consumer first. Afterwards when signal is connected it calls currentActivityChanged \
slot and fails to set containment on null view.
Diffs
-----
shell/standaloneappcorona.cpp efa5c91
Diff: https://git.reviewboard.kde.org/r/123494/diff/
Testing
-------
works fine
Thanks,
Bhushan Shah
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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/123494/">https://git.reviewboard.kde.org/r/123494/</a>
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<h1 style="margin: 0; padding: 0; font-size: 10pt;">This change has been marked as \
submitted.</h1> </td>
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<div>Review request for Plasma, Ivan Čukić and Marco Martin.</div>
<div>By Bhushan Shah.</div>
<p style="color: grey;"><i>Updated April 25, 2015, 2:09 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Changes</h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">Submitted with commit 317421fd23eabd17d84320a31552c40ccd45a778 by \
Bhushan Shah to branch master.</pre> </td>
</tr>
</table>
<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt;">Repository: </b>
plasma-workspace
</div>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: \
inherit;white-space: inherit;">This avoids the crash situation where something have \
created the activity consumer earlier and currentActivityChanged signal is emitted \
before view is created.</p> <p style="padding: 0;text-rendering: inherit;margin: \
0;line-height: inherit;white-space: inherit;"><div class="codehilite" \
style="background: #f8f8f8"><pre style="line-height: 125%">#0 \
PlasmaQuick::View::setContainment (this=0x0, cont=0x16a9fc0) at \
/home/bshah/aur/plasma-framework-git/src/plasma-framework/src/plasmaquick/view.cpp:243
#1 0x0000000000462097 in StandaloneAppCorona::currentActivityChanged \
(this=0x7772a0, newActivity=...) at \
/home/bshah/aur/plasma-workspace-git/src/plasma-workspace/shell/standaloneappcorona.cpp:192
#2 0x00007ffff32383c9 in QMetaObject::activate(QObject*, int, int, void**) () from \
/usr/lib/libQt5Core.so.5 #3 0x00007ffff71f9763 in \
KActivities::Consumer::currentActivityChanged (this=0x741aa0, _t1=...) at \
/home/bshah/aur/kactivities-git/src/build/src/lib/core/moc_consumer.cpp:216 #4 \
0x00007ffff71f94dd in KActivities::Consumer::qt_static_metacall (_o=0x741aa0, \
_c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fffffffa570) at \
/home/bshah/aur/kactivities-git/src/build/src/lib/core/moc_consumer.cpp:103 #5 \
0x00007ffff32383c9 in QMetaObject::activate(QObject*, int, int, void**) () from \
/usr/lib/libQt5Core.so.5 #6 0x00007ffff71f91d6 in \
KActivities::ActivitiesCache::currentActivityChanged (this=0x77c900, _t1=...) at \
/home/bshah/aur/kactivities-git/src/build/src/lib/core/moc_activitiescache_p.cpp:353 \
#7 0x00007ffff71ee4f7 in KActivities::ActivitiesCache::setCurrentActivity \
(this=0x77c900, activity=...) at \
/home/bshah/aur/kactivities-git/src/kactivities/src/lib/core/activitiescache_p.cpp:297
</pre></div>
</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: \
inherit;white-space: inherit;">I hit this crash when creating recent media backend \
for pmc. First backendsmodel is initalized which in turn loads the recentmedia \
backend and hence creates the activity consumer first. Afterwards when signal is \
connected it calls currentActivityChanged slot and fails to set containment on null \
view.</p></pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: \
inherit;white-space: inherit;">works fine</p></pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>shell/standaloneappcorona.cpp <span style="color: grey">(efa5c91)</span></li>
</ul>
<p><a href="https://git.reviewboard.kde.org/r/123494/diff/" style="margin-left: \
3em;">View Diff</a></p>
</td>
</tr>
</table>
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