Bug 328054

Summary: Plasma crashed when dragging widget to bottom edge of screen
Product: [Unmaintained] plasma4 Reporter: Martin Brook <kde>
Component: generalAssignee: Plasma Bugs List <plasma-bugs>
Status: RESOLVED DUPLICATE    
Severity: crash CC: dale.iremonger
Priority: NOR Keywords: drkonqi
Version: 4.11.2   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: New crash information added by DrKonqi

Description Martin Brook 2013-11-25 11:31:34 UTC 
Application: plasma-desktop (4.11.2)
KDE Platform Version: 4.11.2
Qt Version: 4.8.4
Operating System: Linux 3.11.0-12-generic x86_64
Distribution: Ubuntu 13.10

-- Information about the crash:
- What I was doing when the application crashed:

* Right-click panel, select Panel options -> add widgets
* Choose a widget (I was able to reproduce this with several different widgets) and drag to bottom edge of the screen, near the middle
* Plasma crashes

It may be relevant to mention that I have multiple workspaces set up, arranged vertically.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f07380ad7c0 (LWP 3160))]

Thread 15 (Thread 0x7f071c4fc700 (LWP 3161)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f0730d4006b in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f0730d400a9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f072b3faf6e in start_thread (arg=0x7f071c4fc700) at pthread_create.c:311
#4  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 14 (Thread 0x7f069ab51700 (LWP 3162)):
#0  0x00007f0737980f7d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f072acf0694 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f072acf079c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0734559a76 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007f073452b5ef in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5  0x00007f073452b8e5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f073442a88f in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007f073450cd13 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007f072b3faf6e in start_thread (arg=0x7f069ab51700) at pthread_create.c:311
#10 0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 13 (Thread 0x7f0699dc9700 (LWP 3163)):
#0  0x00007f072acefd14 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f072acf05b3 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f072acf079c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0734559a76 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007f073452b5ef in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5  0x00007f073452b8e5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f073442a88f in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007f073450cd13 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007f072b3faf6e in start_thread (arg=0x7f0699dc9700) at pthread_create.c:311
#10 0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 12 (Thread 0x7f067e0aa700 (LWP 6815)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f073442d406 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f072ffbae6c in ?? () from /usr/lib/libthreadweaver.so.4
#3  0x00007f072ffbd903 in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f072ffbc61f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#5  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f072b3faf6e in start_thread (arg=0x7f067e0aa700) at pthread_create.c:311
#7  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 11 (Thread 0x7f0676f87700 (LWP 6816)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f073442d406 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f072ffbae6c in ?? () from /usr/lib/libthreadweaver.so.4
#3  0x00007f072ffbd903 in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f072ffbc61f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#5  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f072b3faf6e in start_thread (arg=0x7f0676f87700) at pthread_create.c:311
#7  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 10 (Thread 0x7f0676786700 (LWP 6817)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f073442d406 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f072ffbae6c in ?? () from /usr/lib/libthreadweaver.so.4
#3  0x00007f072ffbd903 in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f072ffbc61f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#5  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f072b3faf6e in start_thread (arg=0x7f0676786700) at pthread_create.c:311
#7  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 9 (Thread 0x7f0675f85700 (LWP 6818)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f073442d406 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f072ffbae6c in ?? () from /usr/lib/libthreadweaver.so.4
#3  0x00007f072ffbd903 in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f072ffbd91c in ?? () from /usr/lib/libthreadweaver.so.4
#5  0x00007f072ffbd91c in ?? () from /usr/lib/libthreadweaver.so.4
#6  0x00007f072ffbc61f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#7  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00007f072b3faf6e in start_thread (arg=0x7f0675f85700) at pthread_create.c:311
#9  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 8 (Thread 0x7f0675784700 (LWP 6819)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f073442d406 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f072ffbae6c in ?? () from /usr/lib/libthreadweaver.so.4
#3  0x00007f072ffbd903 in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f072ffbc61f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#5  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f072b3faf6e in start_thread (arg=0x7f0675784700) at pthread_create.c:311
#7  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 7 (Thread 0x7f065ffff700 (LWP 6824)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f073442d406 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f072ffbae6c in ?? () from /usr/lib/libthreadweaver.so.4
#3  0x00007f072ffbd903 in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f072ffbd91c in ?? () from /usr/lib/libthreadweaver.so.4
#5  0x00007f072ffbc61f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#6  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007f072b3faf6e in start_thread (arg=0x7f065ffff700) at pthread_create.c:311
#8  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 6 (Thread 0x7f065f7fe700 (LWP 6825)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f073442d406 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f072ffbae6c in ?? () from /usr/lib/libthreadweaver.so.4
#3  0x00007f072ffbd903 in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f072ffbc61f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#5  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f072b3faf6e in start_thread (arg=0x7f065f7fe700) at pthread_create.c:311
#7  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 5 (Thread 0x7f065effd700 (LWP 6826)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f073442d406 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f072ffbae6c in ?? () from /usr/lib/libthreadweaver.so.4
#3  0x00007f072ffbd903 in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f072ffbd91c in ?? () from /usr/lib/libthreadweaver.so.4
#5  0x00007f072ffbc61f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#6  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007f072b3faf6e in start_thread (arg=0x7f065effd700) at pthread_create.c:311
#8  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 4 (Thread 0x7f065e7fc700 (LWP 31717)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f07329091cd in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f0732909209 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f072b3faf6e in start_thread (arg=0x7f065e7fc700) at pthread_create.c:311
#4  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7f0606ca0700 (LWP 31718)):
#0  0x00007f072b3fe05f in __pthread_mutex_unlock_usercnt (mutex=0x7f064c003960, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  0x00007f072ad303c1 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f072aceffab in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f072acf0602 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f072acf079c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f0734559a76 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f073452b5ef in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007f073452b8e5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00007f073442a88f in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007f073442cf2f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007f072b3faf6e in start_thread (arg=0x7f0606ca0700) at pthread_create.c:311
#11 0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7f05fffff700 (LWP 31721)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f0732649bbd in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f0732938a76 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f072b3faf6e in start_thread (arg=0x7f05fffff700) at pthread_create.c:311
#4  0x00007f073798d9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7f07380ad7c0 (LWP 3160)):
[KCrash Handler]
#5  0x00007f07378c9f77 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#6  0x00007f07378cd5e8 in __GI_abort () at abort.c:90
#7  0x00007f07379074fb in __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0x7f0737a1b240 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:199
#8  0x00007f0737913996 in malloc_printerr (ptr=0x7fff8d79acd0, str=0x7f0737a1b370 "double free or corruption (out)", action=3) at malloc.c:4923
#9  _int_free (av=<optimized out>, p=0x7fff8d79acc0, have_lock=0) at malloc.c:3779
#10 0x00007f068e09b5c0 in ?? () from /usr/lib/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#11 0x00007f068e09adb1 in ?? () from /usr/lib/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#12 0x00007f068e09aea4 in ?? () from /usr/lib/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#13 0x00007f0733e72c72 in QGraphicsItem::sceneEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#14 0x00007f0736126a54 in QDeclarativeItem::sceneEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtDeclarative.so.4
#15 0x00007f0733e99757 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#16 0x00007f0733e9978f in QGraphicsScene::dragLeaveEvent(QGraphicsSceneDragDropEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#17 0x00007f0733eae7c0 in QGraphicsScene::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#18 0x00007f07338c9dfc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#19 0x00007f07338d0470 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#20 0x00007f07351f0a6a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#21 0x00007f073452c8bd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#22 0x00007f0733ec66d8 in QGraphicsView::dragLeaveEvent(QDragLeaveEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#23 0x00007f0733919087 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#24 0x00007f0733cba5be in QFrame::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#25 0x00007f0733ec5e09 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#26 0x00007f073452ca26 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#27 0x00007f07338c9ddc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#28 0x00007f07338d12fe in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#29 0x00007f07351f0a6a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#30 0x00007f073452c8bd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#31 0x00007f073395150e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#32 0x00007f0733951650 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#33 0x00007f0733951a5a in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#34 0x00007f07338dab7a in QDrag::~QDrag() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#35 0x00007f07338dab99 in QDrag::~QDrag() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#36 0x00007f0734543308 in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#37 0x00007f0733915b37 in QWidget::~QWidget() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#38 0x00007f0733915e49 in QWidget::~QWidget() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#39 0x00007f0734543308 in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#40 0x00007f0733915b37 in QWidget::~QWidget() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#41 0x00007f0733ebff65 in QGraphicsView::~QGraphicsView() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#42 0x00007f0733ebff99 in QGraphicsView::~QGraphicsView() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#43 0x00007f0737c88664 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#44 0x00007f0737c886b9 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#45 0x00007f0734544e08 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#46 0x00007f073391936b in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#47 0x00007f07338c9dfc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#48 0x00007f07338d0470 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#49 0x00007f07351f0a6a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#50 0x00007f073452c8bd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#51 0x00007f073452fe1f in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#52 0x00007f073455a073 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#53 0x00007f072acf03a6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#54 0x00007f072acf06f8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#55 0x00007f072acf079c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#56 0x00007f0734559a55 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#57 0x00007f073396b9d6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#58 0x00007f073452b5ef in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#59 0x00007f073452b8e5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#60 0x00007f0733953ebd in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#61 0x00007f07338dadda in QDrag::exec(QFlags<Qt::DropAction>, Qt::DropAction) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#62 0x00007f068e09ac68 in ?? () from /usr/lib/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#63 0x00007f068e09ad21 in ?? () from /usr/lib/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#64 0x00007f0733e94fd5 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#65 0x00007f0733e9963e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#66 0x00007f0733e99b3f in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#67 0x00007f0733ea26f6 in QGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#68 0x00007f0733eae62c in QGraphicsScene::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#69 0x00007f07338c9dfc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#70 0x00007f07338d0470 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#71 0x00007f07351f0a6a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#72 0x00007f073452c8bd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#73 0x00007f0733ec38ac in QGraphicsViewPrivate::mouseMoveEventHandler(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#74 0x00007f0733ec47ba in QGraphicsView::mouseMoveEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#75 0x00007f0733919445 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#76 0x00007f0733cba5be in QFrame::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#77 0x00007f0733ec5e09 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#78 0x00007f073452ca26 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#79 0x00007f07338c9ddc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#80 0x00007f07338d05ad in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#81 0x00007f07351f0a6a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#82 0x00007f073452c8bd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#83 0x00007f07338cfd63 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#84 0x00007f07339447db in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#85 0x00007f0733944079 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#86 0x00007f073396b922 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#87 0x00007f072acf03a6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#88 0x00007f072acf06f8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#89 0x00007f072acf079c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#90 0x00007f0734559a55 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#91 0x00007f073396b9d6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#92 0x00007f073452b5ef in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#93 0x00007f073452b8e5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#94 0x00007f0734530e5b in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#95 0x00007f0737c9727c in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#96 0x00007f07378b4de5 in __libc_start_main (main=0x4006e0, argc=1, ubp_av=0x7fff8d79d5a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff8d79d598) at libc-start.c:260
#97 0x000000000040070e in _start ()

Possible duplicates by query: bug 327971, bug 327905, bug 327598, bug 326809, bug 325986.

Reported using DrKonqi
Comment 1 Martin Brook 2013-11-25 11:35:28 UTC 
Looking at some search results, I think this is probably a duplicate of 315303. Sorry, that bug was not among the suggestions when I was submitting this via the wizard.

*** This bug has been marked as a duplicate of bug 315303 ***
Comment 2 dale.iremonger 2014-01-18 21:48:34 UTC 
Created attachment 84724 [details]
New crash information added by DrKonqi

plasma-desktop (4.11.3) on KDE Platform 4.11.3 using Qt 4.8.6

- What I was doing when the application crashed:

selected new widget, draged down to panel, before i could release mouse button crash would occur.

For me the bug only happens occasionally since i have successfully changed widgets.

-- Backtrace (Reduced):
#5  0x00007fa6ff36c1d5 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#6  0x00007fa6ff36f388 in __GI_abort () at abort.c:90
[...]
#8  0x00007fa6ff3b1a16 in malloc_printerr (action=3, str=0x7fa6ff4a44b8 "double free or corruption (out)", ptr=<optimized out>) at malloc.c:4923
#9  0x00007fa6ff3b2793 in _int_free (av=<optimized out>, p=0x7ffff2aaeb10, have_lock=0) at malloc.c:3779
[...]
#13 0x00007fa6fb8ac052 in QGraphicsItem::sceneEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4