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List:       calligra-devel
Subject:    Re: Review Request 114578: Fix crash in SnapGuideDocker
From:       "Elvis Stansvik" <elvstone () gmail ! com>
Date:       2013-12-21 10:06:34
Message-ID: 20131221100634.12082.37307 () vidsolbach ! de
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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/114578/
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(Updated Dec. 21, 2013, 10:06 a.m.)


Status
------

This change has been marked as submitted.


Review request for Calligra.


Repository: calligra


Description
-------

Karbon currently crashes for me upon exit with the following backtrace:

Application: Karbon (karbon), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f9354d3b7c0 (LWP 8743))]

Thread 2 (Thread 0x7f93383e9700 (LWP 8747)):
#0  0x00007f934e34f9dd in poll () from /usr/lib/libc.so.6
#1  0x00007f934968e584 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f934968e68c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f934f200b46 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () \
from /usr/lib/libQtCore.so.4 #4  0x00007f934f1d2b1f in \
QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4 #5  \
0x00007f934f1d2e15 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from \
/usr/lib/libQtCore.so.4 #6  0x00007f934f0d16ef in QThread::exec() () from /usr/lib/libQtCore.so.4
#7  0x00007f934f1b42c3 in ?? () from /usr/lib/libQtCore.so.4
#8  0x00007f934f0d3d8f in ?? () from /usr/lib/libQtCore.so.4
#9  0x00007f934ee430a2 in start_thread () from /usr/lib/libpthread.so.0
#10 0x00007f934e35849d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f9354d3b7c0 (LWP 8743)):
[KCrash Handler]
#5  0x00007f935352739c in QFlags<KoSnapGuide::Strategy>::QFlags (this=0x7fff2ed4be70, f=...) at \
/usr/include/qt4/QtCore/qglobal.h:2311 #6  0x00007f935352683f in KoSnapGuide::enabledSnapStrategies \
(this=0x152b5f0) at /home/estan/kde4/src/calligra/libs/flake/KoSnapGuide.cpp:98 #7  0x00007f935352f18c in \
SnapGuideConfigWidget::updateControls (this=0x5beaa30) at \
/home/estan/kde4/src/calligra/libs/flake/SnapGuideConfigWidget.cpp:94 #8  0x00007f935352f346 in \
SnapGuideConfigWidget::showEvent (this=0x5beaa30, event=0x7fff2ed4c260) at \
/home/estan/kde4/src/calligra/libs/flake/SnapGuideConfigWidget.cpp:109 #9  0x00007f93500f53c9 in \
QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4 #10 0x00007f93500a60dc in \
QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #11 \
0x00007f93500ac6a0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #12 \
0x00007f935412f358 in KoApplication::notify (this=0x7fff2ed4cf30, receiver=0x5beaa30, \
event=0x7fff2ed4c260) at /home/estan/kde4/src/calligra/libs/main/KoApplication.cpp:554 #13 \
0x00007f934f1d3ebd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4 \
#14 0x00007f93500f2b1f in QWidgetPrivate::show_helper() () from /usr/lib/libQtGui.so.4 #15 \
0x00007f93500f298a in QWidgetPrivate::showChildren(bool) () from /usr/lib/libQtGui.so.4 #16 \
0x00007f93500f2a1f in QWidgetPrivate::show_helper() () from /usr/lib/libQtGui.so.4 #17 0x00007f93500f47d4 \
in QWidget::setVisible(bool) () from /usr/lib/libQtGui.so.4 #18 0x00007f935416f484 in \
KoMainWindow::closeEvent (this=0x173fd80, e=0x7fff2ed4c870) at \
/home/estan/kde4/src/calligra/libs/main/KoMainWindow.cpp:1160 #19 0x00007f93500f522e in \
QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4 #20 0x00007f93504ab2d3 in \
QMainWindow::event(QEvent*) () from /usr/lib/libQtGui.so.4 #21 0x00007f9350eb1d79 in \
KXmlGuiWindow::event(QEvent*) () from /usr/lib/libkdeui.so.5 #22 0x00007f93500a60dc in \
QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #23 \
0x00007f93500ac6a0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #24 \
0x00007f935412f358 in KoApplication::notify (this=0x7fff2ed4cf30, receiver=0x173fd80, \
event=0x7fff2ed4c870) at /home/estan/kde4/src/calligra/libs/main/KoApplication.cpp:554 #25 \
0x00007f934f1d3ebd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4 \
#26 0x00007f93500f1a89 in QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) () from \
/usr/lib/libQtGui.so.4 #27 0x00007f935010fa82 in QApplication::x11ClientMessage(QWidget*, _XEvent*, bool) \
() from /usr/lib/libQtGui.so.4 #28 0x00007f935011ca5f in QApplication::x11ProcessEvent(_XEvent*) () from \
/usr/lib/libQtGui.so.4 #29 0x00007f9350143162 in ?? () from /usr/lib/libQtGui.so.4
#30 0x00007f934968e296 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0x00007f934968e5e8 in ?? () from /usr/lib/libglib-2.0.so.0
#32 0x00007f934968e68c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0x00007f934f200b25 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () \
from /usr/lib/libQtCore.so.4 #34 0x00007f9350143216 in ?? () from /usr/lib/libQtGui.so.4
#35 0x00007f934f1d2b1f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from \
/usr/lib/libQtCore.so.4 #36 0x00007f934f1d2e15 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) \
() from /usr/lib/libQtCore.so.4 #37 0x00007f934f1d7f4b in QCoreApplication::exec() () from \
/usr/lib/libQtCore.so.4 #38 0x00007f935492d076 in kdemain (argc=1, argv=0x7fff2ed4d148) at \
/home/estan/kde4/src/calligra/karbon/main.cpp:80 #39 0x00000000004009b2 in main (argc=1, \
argv=0x7fff2ed4d148) at /home/estan/kde4/build/calligra/karbon/karbon_dummy.cpp:3

The attached patch fixes the issue, and at least intuitively makes sense to me: It makes \
SnapGuideDocker::unsetCanvas() symmetric to SnapGuideDocker::setCanvas(KoCanvasBase *canvas). But I would \
like someone who is familiar with this code to comment.


Diffs
-----

  plugins/dockers/snapguidedocker/SnapGuideDocker.cpp f0950a9 

Diff: http://git.reviewboard.kde.org/r/114578/diff/


Testing
-------

Launched Karbon, created a new document. Without the patch, Karbon crashes on exit. With it, all is fine.


Thanks,

Elvis Stansvik


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      This is an automatically generated e-mail. To reply, visit:
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   <h1 style="margin-right: 0.2em; padding: 0; font-size: 10pt;">This change has been marked as \
submitted.</h1>  </td>
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<table bgcolor="#fefadf" width="100%" cellspacing="0" cellpadding="8" style="background-image: \
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<div>Review request for Calligra.</div>
<div>By Elvis Stansvik.</div>


<p style="color: grey;"><i>Updated Dec. 21, 2013, 10:06 a.m.</i></p>









<div style="margin-top: 1.5em;">
 <b style="color: #575012; font-size: 10pt;">Repository: </b>
calligra
</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;">Karbon currently crashes for me upon exit \
with the following backtrace:

Application: Karbon (karbon), signal: Segmentation fault
Using host libthread_db library &quot;/usr/lib/libthread_db.so.1&quot;.
[Current thread is 1 (Thread 0x7f9354d3b7c0 (LWP 8743))]

Thread 2 (Thread 0x7f93383e9700 (LWP 8747)):
#0  0x00007f934e34f9dd in poll () from /usr/lib/libc.so.6
#1  0x00007f934968e584 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f934968e68c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f934f200b46 in \
QEventDispatcherGlib::processEvents(QFlags&lt;QEventLoop::ProcessEventsFlag&gt;) () from \
/usr/lib/libQtCore.so.4 #4  0x00007f934f1d2b1f in \
QEventLoop::processEvents(QFlags&lt;QEventLoop::ProcessEventsFlag&gt;) () from /usr/lib/libQtCore.so.4 #5 \
0x00007f934f1d2e15 in QEventLoop::exec(QFlags&lt;QEventLoop::ProcessEventsFlag&gt;) () from \
/usr/lib/libQtCore.so.4 #6  0x00007f934f0d16ef in QThread::exec() () from /usr/lib/libQtCore.so.4
#7  0x00007f934f1b42c3 in ?? () from /usr/lib/libQtCore.so.4
#8  0x00007f934f0d3d8f in ?? () from /usr/lib/libQtCore.so.4
#9  0x00007f934ee430a2 in start_thread () from /usr/lib/libpthread.so.0
#10 0x00007f934e35849d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f9354d3b7c0 (LWP 8743)):
[KCrash Handler]
#5  0x00007f935352739c in QFlags&lt;KoSnapGuide::Strategy&gt;::QFlags (this=0x7fff2ed4be70, f=...) at \
/usr/include/qt4/QtCore/qglobal.h:2311 #6  0x00007f935352683f in KoSnapGuide::enabledSnapStrategies \
(this=0x152b5f0) at /home/estan/kde4/src/calligra/libs/flake/KoSnapGuide.cpp:98 #7  0x00007f935352f18c in \
SnapGuideConfigWidget::updateControls (this=0x5beaa30) at \
/home/estan/kde4/src/calligra/libs/flake/SnapGuideConfigWidget.cpp:94 #8  0x00007f935352f346 in \
SnapGuideConfigWidget::showEvent (this=0x5beaa30, event=0x7fff2ed4c260) at \
/home/estan/kde4/src/calligra/libs/flake/SnapGuideConfigWidget.cpp:109 #9  0x00007f93500f53c9 in \
QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4 #10 0x00007f93500a60dc in \
QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #11 \
0x00007f93500ac6a0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #12 \
0x00007f935412f358 in KoApplication::notify (this=0x7fff2ed4cf30, receiver=0x5beaa30, \
event=0x7fff2ed4c260) at /home/estan/kde4/src/calligra/libs/main/KoApplication.cpp:554 #13 \
0x00007f934f1d3ebd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4 \
#14 0x00007f93500f2b1f in QWidgetPrivate::show_helper() () from /usr/lib/libQtGui.so.4 #15 \
0x00007f93500f298a in QWidgetPrivate::showChildren(bool) () from /usr/lib/libQtGui.so.4 #16 \
0x00007f93500f2a1f in QWidgetPrivate::show_helper() () from /usr/lib/libQtGui.so.4 #17 0x00007f93500f47d4 \
in QWidget::setVisible(bool) () from /usr/lib/libQtGui.so.4 #18 0x00007f935416f484 in \
KoMainWindow::closeEvent (this=0x173fd80, e=0x7fff2ed4c870) at \
/home/estan/kde4/src/calligra/libs/main/KoMainWindow.cpp:1160 #19 0x00007f93500f522e in \
QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4 #20 0x00007f93504ab2d3 in \
QMainWindow::event(QEvent*) () from /usr/lib/libQtGui.so.4 #21 0x00007f9350eb1d79 in \
KXmlGuiWindow::event(QEvent*) () from /usr/lib/libkdeui.so.5 #22 0x00007f93500a60dc in \
QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #23 \
0x00007f93500ac6a0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #24 \
0x00007f935412f358 in KoApplication::notify (this=0x7fff2ed4cf30, receiver=0x173fd80, \
event=0x7fff2ed4c870) at /home/estan/kde4/src/calligra/libs/main/KoApplication.cpp:554 #25 \
0x00007f934f1d3ebd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4 \
#26 0x00007f93500f1a89 in QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) () from \
/usr/lib/libQtGui.so.4 #27 0x00007f935010fa82 in QApplication::x11ClientMessage(QWidget*, _XEvent*, bool) \
() from /usr/lib/libQtGui.so.4 #28 0x00007f935011ca5f in QApplication::x11ProcessEvent(_XEvent*) () from \
/usr/lib/libQtGui.so.4 #29 0x00007f9350143162 in ?? () from /usr/lib/libQtGui.so.4
#30 0x00007f934968e296 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0x00007f934968e5e8 in ?? () from /usr/lib/libglib-2.0.so.0
#32 0x00007f934968e68c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0x00007f934f200b25 in \
QEventDispatcherGlib::processEvents(QFlags&lt;QEventLoop::ProcessEventsFlag&gt;) () from \
/usr/lib/libQtCore.so.4 #34 0x00007f9350143216 in ?? () from /usr/lib/libQtGui.so.4
#35 0x00007f934f1d2b1f in QEventLoop::processEvents(QFlags&lt;QEventLoop::ProcessEventsFlag&gt;) () from \
/usr/lib/libQtCore.so.4 #36 0x00007f934f1d2e15 in \
QEventLoop::exec(QFlags&lt;QEventLoop::ProcessEventsFlag&gt;) () from /usr/lib/libQtCore.so.4 #37 \
0x00007f934f1d7f4b in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4 #38 0x00007f935492d076 in \
kdemain (argc=1, argv=0x7fff2ed4d148) at /home/estan/kde4/src/calligra/karbon/main.cpp:80 #39 \
0x00000000004009b2 in main (argc=1, argv=0x7fff2ed4d148) at \
/home/estan/kde4/build/calligra/karbon/karbon_dummy.cpp:3

The attached patch fixes the issue, and at least intuitively makes sense to me: It makes \
SnapGuideDocker::unsetCanvas() symmetric to SnapGuideDocker::setCanvas(KoCanvasBase *canvas). But I would \
like someone who is familiar with this code to comment.</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;">Launched Karbon, created a new document. \
Without the patch, Karbon crashes on exit. With it, all is fine.</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>plugins/dockers/snapguidedocker/SnapGuideDocker.cpp <span style="color: grey">(f0950a9)</span></li>

</ul>

<p><a href="http://git.reviewboard.kde.org/r/114578/diff/" style="margin-left: 3em;">View Diff</a></p>







  </td>
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