Version: 4.0.71 (using Devel) Installed from: Compiled sources OS: Linux Because I wanted to reorder the widgets in the panel I removed the pager widget. Afterwards I called "Add Widgets". Result: Plasma crashed with "A Fatal Error" and reloaded with the settings it had before the crash i.e. pager was there again. So I tried again: removed pager, called "Add Widgets". Result: Plasma crashed and didn't recover (overall grey desktop with nothing on it) so I had to do a Ctrl-Alt-Backspace to restart the X server. I repeated this a few times, it's always the same. Removing a widget from the panel (pager, show desktop,...) and calling "Add Widgets" first time crashes and restores Plasma, second time crashes Plasma and locks X.
This was previously reported by mail on panel-devel as well. Here's a backtrace from Sebastian Kuegler: Application: Plasma Workspace (plasma), signal SIGSEGV [Thread debugging using libthread_db enabled] [New Thread 0xb573b720 (LWP 30139)] [New Thread 0xb3020b90 (LWP 30141)] [New Thread 0xb3e08b90 (LWP 30140)] [KCrash handler] #6 0xb6499c05 in QGraphicsLayoutItem::sizePolicy (this=0x821b718) at graphicsview/qgraphicslayoutitem.cpp:332 #7 0xb64a7463 in QGridLayoutItem::sizePolicy (this=0x82b5c48, orientation=Qt::Horizontal) at graphicsview/qgridlayoutengine.cpp:531 #8 0xb64a7fd6 in QGridLayoutItem::stretchFactor (this=0x82b5c48, orientation=Qt::Horizontal) at graphicsview/qgridlayoutengine.cpp:512 #9 0xb64a876b in QGridLayoutEngine::fillRowData (this=0x816be64, rowData=0x816bec8, styleInfo=@0xbf8ca05c, orientation=Qt::Horizontal) at graphicsview/qgridlayoutengine.cpp:1265 #10 0xb64aa508 in QGridLayoutEngine::ensureColumnAndRowData (this=0x816be64, styleInfo=@0xbf8ca05c) at graphicsview/qgridlayoutengine.cpp:1417 #11 0xb64aa6a2 in QGridLayoutEngine::ensureGeometries (this=0x816be64, styleInfo=@0xbf8ca05c, size=@0xbf8c9fb8) at graphicsview/qgridlayoutengine.cpp:1432 #12 0xb64aab2d in QGridLayoutEngine::setGeometries (this=0x816be64, styleInfo=@0xbf8ca05c, contentsGeometry=@0xbf8ca038) at graphicsview/qgridlayoutengine.cpp:961 #13 0xb649bc9e in QGraphicsLinearLayout::setGeometry (this=0x8280230, rect=@0xbf8ca0d8) at graphicsview/qgraphicslinearlayout.cpp:489 #14 0xb64988b5 in QGraphicsLayout::activate (this=0x8280230) at graphicsview/qgraphicslayout.cpp:251 #15 0xb6498977 in QGraphicsLayout::widgetEvent (this=0x8280230, e=0x83dac30) at graphicsview/qgraphicslayout.cpp:314 #16 0xb649cd46 in QGraphicsWidget::event (this=0x817a168, event=0x83dac30) at graphicsview/qgraphicswidget.cpp:1153 #17 0xb5eb290d in QApplicationPrivate::notify_helper (this=0x807a7f0, receiver=0x817a168, e=0x83dac30) at kernel/qapplication.cpp:3766 #18 0xb5eb2bf3 in QApplication::notify (this=0x807c770, receiver=0x817a168, e=0x83dac30) at kernel/qapplication.cpp:3360 #19 0xb79ea8f1 in KApplication::notify (this=0x807c770, receiver=0x817a168, event=0x83dac30) at /data/kdedev/kde/src/kdelibs/kdeui/kernel/kapplication.cpp:311 #20 0xb6b5363a in QCoreApplication::notifyInternal (this=0x807c770, receiver=0x817a168, event=0x83dac30) at kernel/qcoreapplication.cpp:583 #21 0xb709520b in QCoreApplication::sendEvent (receiver=0x817a168, event=0x83dac30) at ../../../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215 #22 0xb6b53b52 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x804aec0) at kernel/qcoreapplication.cpp:1195 #23 0xb6b53d03 in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1091 #24 0xb6b84552 in QCoreApplication::sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220 #25 0xb6b83763 in postEventSourceDispatch (s=0x807c940) at kernel/qeventdispatcher_glib.cpp:211 #26 0xb5875bf8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #27 0xb5878e5e in ?? () from /usr/lib/libglib-2.0.so.0 #28 0x0807c8b8 in ?? () #29 0x00000000 in ?? () #0 0xffffe410 in __kernel_vsyscall ()
I also got a very similar BT on debian experimental (4.0.72). In my case what I did was just trying to change K menu to "traditional style". Right click on K button, "Change to classic style". I'm attaching my backtrace yet almost the same.
Created attachment 24798 [details] Backtrace of the crash.
Sorry, I'm sleepy, but isn't it this a dupe of http://bugs.kde.org/show_bug.cgi?id=161167 One more note, plasma doesn't crash so badly here. Same usability as before the crash, svn rev 802997. Regards,
*** Bug 161167 has been marked as a duplicate of this bug. ***
using trunk/
I can confirm this crash. Simply add a clock widget to the desktop, drag it somewhere and close it afterwards. This crashes for me everytimes. gdb gives me a batrace like the above. valgrind gives this: ==9425== Invalid read of size 4 ==9425== at 0x50F6E99: QGraphicsLayoutItem::sizePolicy() const (qgraphicslayoutitem.cpp:327) ==9425== by 0x51031B6: QGridLayoutItem::sizePolicy(Qt::Orientation) const (qgridlayoutengine.cpp:525) ==9425== by 0x51035FE: QGridLayoutItem::stretchFactor(Qt::Orientation) const (qgridlayoutengine.cpp:506) ==9425== by 0x5104E30: QGridLayoutEngine::fillRowData(QGridLayoutRowData*, QLayoutStyleInfo const&, Qt::Orientation) const (qgridlayoutengine.cpp:1259) ==9425== by 0x510617E: QGridLayoutEngine::ensureColumnAndRowData(QLayoutStyleInfo const&) const (qgridlayoutengine.cpp:1411) ==9425== by 0x5106305: QGridLayoutEngine::ensureGeometries(QLayoutStyleInfo const&, QSizeF const&) const (qgridlayoutengine.cpp:1426) ==9425== by 0x51068FB: QGridLayoutEngine::setGeometries(QLayoutStyleInfo const&, QRectF const&) (qgridlayoutengine.cpp:955) ==9425== by 0x510DBBE: QGraphicsGridLayout::setGeometry(QRectF const&) (qgraphicsgridlayout.cpp:578) ==9425== by 0x50F59C3: QGraphicsLayout::activate() (qgraphicslayout.cpp:247) ==9425== by 0x50F5A4B: QGraphicsLayout::widgetEvent(QEvent*) (qgraphicslayout.cpp:310) ==9425== by 0x50FAF12: QGraphicsWidget::event(QEvent*) (qgraphicswidget.cpp:1163) ==9425== by 0x4B3AB9B: QApplicationPrivate::notify_helper(QObject*, QEvent*) (qapplication.cpp:3804) ==9425== Address 0x6e7fa44 is 20 bytes inside a block of size 28 free'd ==9425== at 0x402371A: operator delete(void*) (in /usr/lib/valgrind/x86-linux/vgpreload_memcheck.so) ==9425== by 0x413DE44: Plasma::Extender::~Extender() (extender.cpp:63) ==9425== by 0x40F7DF3: Plasma::AppletPrivate::~AppletPrivate() (applet.cpp:1647) ==9425== by 0x40FB914: Plasma::Applet::~Applet() (applet.cpp:150) ==9425== by 0x414FF17: Plasma::PopupApplet::~PopupApplet() (popupapplet.cpp:58) ==9425== by 0xA389E5D: ClockApplet::~ClockApplet() (clockapplet.cpp:76) ==9425== by 0xA37B7B0: Clock::~Clock() (clock.cpp:68) ==9425== by 0x58C00FB: qDeleteInEventHandler(QObject*) (qobject.cpp:3665) ==9425== by 0x58C1AFA: QObject::event(QEvent*) (qobject.cpp:1139) ==9425== by 0x50FAF56: QGraphicsWidget::event(QEvent*) (qgraphicswidget.cpp:1239) ==9425== by 0x4B3AB9B: QApplicationPrivate::notify_helper(QObject*, QEvent*) (qapplication.cpp:3804) ==9425== by 0x4B429FD: QApplication::notify(QObject*, QEvent*) (qapplication.cpp:3394) ==9425== ==9425== Invalid read of size 4 ==9425== at 0x50F6E9C: QGraphicsLayoutItem::sizePolicy() const (qgraphicslayoutitem.cpp:327) ==9425== by 0x51031B6: QGridLayoutItem::sizePolicy(Qt::Orientation) const (qgridlayoutengine.cpp:525) ==9425== by 0x51035FE: QGridLayoutItem::stretchFactor(Qt::Orientation) const (qgridlayoutengine.cpp:506) ==9425== by 0x5104E30: QGridLayoutEngine::fillRowData(QGridLayoutRowData*, QLayoutStyleInfo const&, Qt::Orientation) const (qgridlayoutengine.cpp:1259) ==9425== by 0x510617E: QGridLayoutEngine::ensureColumnAndRowData(QLayoutStyleInfo const&) const (qgridlayoutengine.cpp:1411) ==9425== by 0x5106305: QGridLayoutEngine::ensureGeometries(QLayoutStyleInfo const&, QSizeF const&) const (qgridlayoutengine.cpp:1426) ==9425== by 0x51068FB: QGridLayoutEngine::setGeometries(QLayoutStyleInfo const&, QRectF const&) (qgridlayoutengine.cpp:955) ==9425== by 0x510DBBE: QGraphicsGridLayout::setGeometry(QRectF const&) (qgraphicsgridlayout.cpp:578) ==9425== by 0x50F59C3: QGraphicsLayout::activate() (qgraphicslayout.cpp:247) ==9425== by 0x50F5A4B: QGraphicsLayout::widgetEvent(QEvent*) (qgraphicslayout.cpp:310) ==9425== by 0x50FAF12: QGraphicsWidget::event(QEvent*) (qgraphicswidget.cpp:1163) ==9425== by 0x4B3AB9B: QApplicationPrivate::notify_helper(QObject*, QEvent*) (qapplication.cpp:3804) ==9425== Address 0xffffffff is not stack'd, malloc'd or (recently) free'd
Forgot to mention... I used trunk from revision for the backtrace 867674. My Qt ist libqt4-x11-4.4.2+20081003-1.1 from http://download.opensuse.org/repositories/KDE:/Qt44/openSUSE_11.0/
Never mind! The crash disappeared after updating my qt4 to: 4.4.2+20081004-1.1 So it seemed to be a problem in Qt.