Application: plasma-desktop (0.4) KDE Platform Version: 4.6.5 (4.6.5) Qt Version: 4.7.2 Operating System: Linux 2.6.38-11-generic i686 Distribution: Ubuntu 11.04 -- Information about the crash: Plasma crash when I expand grouped windows and the task manager change from 1 to 2 rows. It seems that it only happens when widgets aren't locked. The crash can be reproduced every time. -- Backtrace: Application: Àrea de treball de l'escriptori Plasma (plasma-desktop), signal: Segmentation fault [Current thread is 1 (Thread 0xb7853ad0 (LWP 1824))] Thread 4 (Thread 0xaec18b70 (LWP 1892)): #0 0x01eb47a4 in __pthread_mutex_unlock_usercnt (mutex=0x8d7786c, decr=1) at pthread_mutex_unlock.c:52 #1 0x008bc656 in pthread_mutex_unlock (mutex=0x8d7786c) at forward.c:184 #2 0x06b1cf24 in g_main_context_prepare () from /lib/i386-linux-gnu/libglib-2.0.so.0 #3 0x06b1de63 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0 #4 0x06b1e524 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0 #5 0x02fa6577 in QEventDispatcherGlib::processEvents (this=0x8d777e8, flags=...) at kernel/qeventdispatcher_glib.cpp:424 #6 0x02f78289 in QEventLoop::processEvents (this=0xaec18280, flags=...) at kernel/qeventloop.cpp:149 #7 0x02f78522 in QEventLoop::exec (this=0xaec18280, flags=...) at kernel/qeventloop.cpp:201 #8 0x02e822a0 in QThread::exec (this=0x8c2e8b8) at thread/qthread.cpp:492 #9 0x02f59fdb in QInotifyFileSystemWatcherEngine::run (this=0x8c2e8b8) at io/qfilesystemwatcher_inotify.cpp:248 #10 0x02e84da2 in QThreadPrivate::start (arg=0x8c2e8b8) at thread/qthread_unix.cpp:320 #11 0x01eb0e99 in start_thread (arg=0xaec18b70) at pthread_create.c:304 #12 0x008ae73e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130 Thread 3 (Thread 0xae416b70 (LWP 1893)): #0 0x01eb47a4 in __pthread_mutex_unlock_usercnt (mutex=0x8d39fac, decr=1) at pthread_mutex_unlock.c:52 #1 0x008bc656 in pthread_mutex_unlock (mutex=0x8d39fac) at forward.c:184 #2 0x06b1c5e6 in g_main_context_acquire () from /lib/i386-linux-gnu/libglib-2.0.so.0 #3 0x06b1ddde in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0 #4 0x06b1e524 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0 #5 0x02fa6577 in QEventDispatcherGlib::processEvents (this=0x8d37348, flags=...) at kernel/qeventdispatcher_glib.cpp:424 #6 0x02f78289 in QEventLoop::processEvents (this=0xae416280, flags=...) at kernel/qeventloop.cpp:149 #7 0x02f78522 in QEventLoop::exec (this=0xae416280, flags=...) at kernel/qeventloop.cpp:201 #8 0x02e822a0 in QThread::exec (this=0x8d39c58) at thread/qthread.cpp:492 #9 0x02f59fdb in QInotifyFileSystemWatcherEngine::run (this=0x8d39c58) at io/qfilesystemwatcher_inotify.cpp:248 #10 0x02e84da2 in QThreadPrivate::start (arg=0x8d39c58) at thread/qthread_unix.cpp:320 #11 0x01eb0e99 in start_thread (arg=0xae416b70) at pthread_create.c:304 #12 0x008ae73e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130 Thread 2 (Thread 0xab9ffb70 (LWP 1965)): #0 0x00e75416 in __kernel_vsyscall () #1 0x01eb548c in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:169 #2 0x008bc3fd in __pthread_cond_wait (cond=0x63d12b0, mutex=0x63d1298) at forward.c:139 #3 0x062b8817 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x63cc1c0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359 #4 0x062b8851 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x63cc1c0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464 #5 0x01eb0e99 in start_thread (arg=0xab9ffb70) at pthread_create.c:304 #6 0x008ae73e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130 Thread 1 (Thread 0xb7853ad0 (LWP 1824)): [KCrash Handler] #7 0x00000058 in ?? () #8 0x02f8eda7 in QObject::disconnect (sender=0x9c419d0, signal=0x0, receiver=0x95529d0, method=0x0) at kernel/qobject.cpp:2737 #9 0x044dcf90 in TaskItemLayout::remove (this=0x95529d0, item=0x9c419d0) at ../../../../../plasma/desktop/applets/tasks/taskitemlayout.cpp:161 #10 0x044dd10c in TaskItemLayout::removeTaskItem (this=0x95529d0, item=0x9c419d0) at ../../../../../plasma/desktop/applets/tasks/taskitemlayout.cpp:113 #11 0x044e8fb1 in TaskGroupItem::splitGroup (this=0x9a2a490, newSplitPosition=2) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:145 #12 0x044dcb90 in TaskItemLayout::layoutItems (this=0x8b94bb0) at ../../../../../plasma/desktop/applets/tasks/taskitemlayout.cpp:378 #13 0x044e70d8 in TaskGroupItem::constraintsChanged (this=0x8b37a30, constraints=...) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:857 #14 0x044ebdc6 in TaskGroupItem::qt_metacall (this=0x8b37a30, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xbf839ca8) at ./taskgroupitem.moc:120 #15 0x02f7f6ba in QMetaObject::metacall (object=0x8b37a30, cl=QMetaObject::InvokeMetaMethod, idx=44, argv=0xbf839ca8) at kernel/qmetaobject.cpp:237 #16 0x02f8f4ff in QMetaObject::activate (sender=0x8854e30, m=0x44f05b0, local_signal_index=0, argv=0xbf839ca8) at kernel/qobject.cpp:3287 #17 0x044d7803 in Tasks::constraintsChanged (this=0x8854e30, _t1=...) at ./tasks.moc:115 #18 0x044d787d in Tasks::constraintsEvent (this=0x8854e30, constraints=...) at ../../../../../plasma/desktop/applets/tasks/tasks.cpp:301 #19 0x00a6e4b9 in Plasma::Applet::flushPendingConstraintsEvents (this=0x8854e30) at ../../plasma/applet.cpp:1345 #20 0x00a6f222 in Plasma::Applet::timerEvent (this=0x8854e30, event=0xbf83a3bc) at ../../plasma/applet.cpp:2432 #21 0x02f8e214 in QObject::event (this=0x8854e30, e=0xbf83a3bc) at kernel/qobject.cpp:1190 #22 0x019e8a14 in QGraphicsWidget::event (this=0x8854e30, event=0xbf83a3bc) at graphicsview/qgraphicswidget.cpp:1423 #23 0x0134ed24 in QApplicationPrivate::notify_helper (this=0x8728230, receiver=0x8854e30, e=0xbf83a3bc) at kernel/qapplication.cpp:4462 #24 0x013538ce in QApplication::notify (this=0x871dee8, receiver=0x8854e30, e=0xbf83a3bc) at kernel/qapplication.cpp:3862 #25 0x0105832a in KApplication::notify (this=0x871dee8, receiver=0x8854e30, event=0xbf83a3bc) at ../../kdeui/kernel/kapplication.cpp:311 #26 0x02f790bb in QCoreApplication::notifyInternal (this=0x871dee8, receiver=0x8854e30, event=0xbf83a3bc) at kernel/qcoreapplication.cpp:731 #27 0x02fa91e4 in sendEvent (this=0x872b974) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215 #28 QTimerInfoList::activateTimers (this=0x872b974) at kernel/qeventdispatcher_unix.cpp:604 #29 0x02fa5df4 in timerSourceDispatch (source=0x872b940) at kernel/qeventdispatcher_glib.cpp:184 #30 0x06b1daa8 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0 #31 0x06b1e270 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0 #32 0x06b1e524 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0 #33 0x02fa653c in QEventDispatcherGlib::processEvents (this=0x86b1a90, flags=...) at kernel/qeventdispatcher_glib.cpp:422 #34 0x014051e5 in QGuiEventDispatcherGlib::processEvents (this=0x86b1a90, flags=...) at kernel/qguieventdispatcher_glib.cpp:204 #35 0x02f78289 in QEventLoop::processEvents (this=0xbf83a654, flags=...) at kernel/qeventloop.cpp:149 #36 0x02f78522 in QEventLoop::exec (this=0xbf83a654, flags=...) at kernel/qeventloop.cpp:201 #37 0x02f7cecc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008 #38 0x0134c8e7 in QApplication::exec () at kernel/qapplication.cpp:3736 #39 0x0026b7cb in kdemain (argc=1, argv=0xbf83a874) at ../../../../plasma/desktop/shell/main.cpp:120 #40 0x080485cb in main (argc=1, argv=0xbf83a874) at plasma-desktop_dummy.cpp:3 This bug may be a duplicate of or related to bug 230414. Possible duplicates by query: bug 230414. Reported using DrKonqi
I can't reproduce it anymore after upgrade to kubuntu 11.10 and KDE SC 4.7.2
Created attachment 73624 [details] New crash information added by DrKonqi plasma-desktop (0.4) on KDE Platform 4.8.4 (4.8.4) using Qt 4.8.1 - What I was doing when the application crashed: I ungrouped a group of windows shown in the task bar on Kubuntu 12.04.1. -- Backtrace (Reduced): #6 0x00007fbccae0eb02 in QObject::disconnect (sender=0x437bc10, signal=0x0, receiver=0x3e1aef0, method=0x0) at kernel/qobject.cpp:2891 #7 0x00007fbcb1a6a841 in TaskItemLayout::remove (this=0x3e1aef0, item=0x437bc10) at ../../../../../plasma/desktop/applets/tasks/taskitemlayout.cpp:149 #8 0x00007fbcb1a6a93e in TaskItemLayout::removeTaskItem (this=0x3e1aef0, item=0x437bc10) at ../../../../../plasma/desktop/applets/tasks/taskitemlayout.cpp:112 #9 0x00007fbcb1a75168 in TaskGroupItem::splitGroup (this=0x3b077e0, newSplitPosition=1) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:149 #10 0x00007fbcb1a6a570 in TaskItemLayout::layoutItems (this=0x29ccf00) at ../../../../../plasma/desktop/applets/tasks/taskitemlayout.cpp:378
Reopening based on new backtrace. This used to work in KDE 4.7.x, marked as a regression
Created attachment 83329 [details] crashdump for exanding grouped windows on 4.11 crashdump
Hi, this bug still exists on kubuntu saucy (with saucy ppa, backports and updates) with * plasma-desktop 4:4.11.2-0ubuntu1 * kde 4.11.2 * qt 4:4.8.4+dfsg-0ubuntu18 With attachment 83329 [details] i added the crashdump, i just ungrouped firefox with a fresh kde-workspace (pidgin and dolping also were running, since i need a few windows until grouping is activated) I work at the City of Munich (LiMux) and this is be a serious bug because normal user do not expect that the session completely crashes (even if the recovery works fine). We would be very glad if this bug could be fixed :-) If i shall recreate the bug in other conditions (debug symbols, withoug saucy backports/updates), please tell me, i would be glad to be of help. Sincerely, Dennis Knorr
The problematic code in the backtrace is gone since KDE SC 4.11 with the QML porting of the taskbar. Please try KDE SC 4.11
Dennis, your crash is a duplicate of bug 325383, which is fixed in KDE 4.11.3. In the future, please report new bugs instead of adding to old/unrelated bugs, unless you are sure it is a duplicate.