Bug 327587

Application: plasma-desktop (4.11.2)
KDE Platform Version: 4.11.2
Qt Version: 4.8.4
Operating System: Linux 3.11.0-13-generic x86_64
Distribution: Ubuntu 13.10

-- Information about the crash:
- What I was doing when the application crashed:
I tried to ungroup two windows of an application that were together (Pidgin main page, and a conversation).

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f16058247c0 (LWP 2358))]

Thread 4 (Thread 0x7f15e63ec700 (LWP 2359)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f15fe4c206b in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f15fe4c20a9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f15f8b7bf6e in start_thread (arg=0x7f15e63ec700) at pthread_create.c:311
#4  0x00007f160510f9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7f155a98e700 (LWP 2363)):
#0  0x00007f15f84b10ea in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f15f84b1399 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f15f84707f0 in g_main_context_acquire () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f15f8471565 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f15f84717ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f1601cdba76 in QEventDispatcherGlib::processEvents (this=0x7f15540008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007f1601cad5ef in QEventLoop::processEvents (this=this@entry=0x7f155a98dd70, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007f1601cad8e5 in QEventLoop::exec (this=this@entry=0x7f155a98dd70, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007f1601bac88f in QThread::exec (this=this@entry=0x25b0230) at thread/qthread.cpp:542
#9  0x00007f1601c8ed13 in QInotifyFileSystemWatcherEngine::run (this=0x25b0230) at io/qfilesystemwatcher_inotify.cpp:265
#10 0x00007f1601baef2f in QThreadPrivate::start (arg=0x25b0230) at thread/qthread_unix.cpp:338
#11 0x00007f15f8b7bf6e in start_thread (arg=0x7f155a98e700) at pthread_create.c:311
#12 0x00007f160510f9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7f15530f6700 (LWP 2364)):
#0  0x00007f1605102f7d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f15f84716a4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f15f84717ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1601cdba76 in QEventDispatcherGlib::processEvents (this=0x7f154c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007f1601cad5ef in QEventLoop::processEvents (this=this@entry=0x7f15530f5d70, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f1601cad8e5 in QEventLoop::exec (this=this@entry=0x7f15530f5d70, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f1601bac88f in QThread::exec (this=this@entry=0x3619a70) at thread/qthread.cpp:542
#7  0x00007f1601c8ed13 in QInotifyFileSystemWatcherEngine::run (this=0x3619a70) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007f1601baef2f in QThreadPrivate::start (arg=0x3619a70) at thread/qthread_unix.cpp:338
#9  0x00007f15f8b7bf6e in start_thread (arg=0x7f15530f6700) at pthread_create.c:311
#10 0x00007f160510f9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7f16058247c0 (LWP 2358)):
[KCrash Handler]
#6  QGraphicsItem::ungrabMouse (this=0x629fd80) at graphicsview/qgraphicsitem.cpp:3522
#7  0x00007f16016188af in QGraphicsScenePrivate::clearMouseGrabber (this=this@entry=0x262b470) at graphicsview/qgraphicsscene.cpp:1004
#8  0x00007f160161b9cd in QGraphicsScenePrivate::sendMouseEvent (this=0x262b470, mouseEvent=0x7fff919c4610) at graphicsview/qgraphicsscene.cpp:1279
#9  0x00007f16016246f6 in QGraphicsScene::mouseMoveEvent (this=<optimized out>, mouseEvent=0x7fff919c4610) at graphicsview/qgraphicsscene.cpp:4102
#10 0x00007f160163062c in QGraphicsScene::event (this=0x2701930, event=0x7fff919c4610) at graphicsview/qgraphicsscene.cpp:3451
#11 0x00007f160104bdfc in QApplicationPrivate::notify_helper (this=this@entry=0x25a5920, receiver=receiver@entry=0x2701930, e=e@entry=0x7fff919c4610) at kernel/qapplication.cpp:4567
#12 0x00007f1601052470 in QApplication::notify (this=this@entry=0x259f2b0, receiver=receiver@entry=0x2701930, e=e@entry=0x7fff919c4610) at kernel/qapplication.cpp:4353
#13 0x00007f1602972a6a in KApplication::notify (this=0x259f2b0, receiver=0x2701930, event=0x7fff919c4610) at ../../kdeui/kernel/kapplication.cpp:311
#14 0x00007f1601cae8bd in QCoreApplication::notifyInternal (this=0x259f2b0, receiver=0x2701930, event=event@entry=0x7fff919c4610) at kernel/qcoreapplication.cpp:946
#15 0x00007f160104a526 in sendSpontaneousEvent (event=event@entry=0x7fff919c4610, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#16 qt_sendSpontaneousEvent (receiver=<optimized out>, event=event@entry=0x7fff919c4610) at kernel/qapplication.cpp:5565
#17 0x00007f16016458ac in QGraphicsViewPrivate::mouseMoveEventHandler (this=this@entry=0x44e57b0, event=event@entry=0x7fff919c4c60) at graphicsview/qgraphicsview.cpp:646
#18 0x00007f16016467ba in QGraphicsView::mouseMoveEvent (this=0x4078430, event=0x7fff919c4c60) at graphicsview/qgraphicsview.cpp:3276
#19 0x00007f160109b445 in QWidget::event (this=this@entry=0x4078430, event=event@entry=0x7fff919c4c60) at kernel/qwidget.cpp:8360
#20 0x00007f160143c5be in QFrame::event (this=0x4078430, e=0x7fff919c4c60) at widgets/qframe.cpp:557
#21 0x00007f1601647e09 in QGraphicsView::viewportEvent (this=0x4078430, event=0x7fff919c4c60) at graphicsview/qgraphicsview.cpp:2866
#22 0x00007f1601caea26 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x25a5920, receiver=receiver@entry=0x43cc9e0, event=event@entry=0x7fff919c4c60) at kernel/qcoreapplication.cpp:1056
#23 0x00007f160104bddc in QApplicationPrivate::notify_helper (this=this@entry=0x25a5920, receiver=receiver@entry=0x43cc9e0, e=e@entry=0x7fff919c4c60) at kernel/qapplication.cpp:4563
#24 0x00007f16010525ad in QApplication::notify (this=this@entry=0x259f2b0, receiver=receiver@entry=0x43cc9e0, e=e@entry=0x7fff919c4c60) at kernel/qapplication.cpp:4110
#25 0x00007f1602972a6a in KApplication::notify (this=0x259f2b0, receiver=0x43cc9e0, event=0x7fff919c4c60) at ../../kdeui/kernel/kapplication.cpp:311
#26 0x00007f1601cae8bd in QCoreApplication::notifyInternal (this=0x259f2b0, receiver=receiver@entry=0x43cc9e0, event=event@entry=0x7fff919c4c60) at kernel/qcoreapplication.cpp:946
#27 0x00007f1601051d63 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#28 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x43cc9e0, event=event@entry=0x7fff919c4c60, alienWidget=alienWidget@entry=0x43cc9e0, nativeWidget=nativeWidget@entry=0x4078430, buttonDown=buttonDown@entry=0x7f1601b302f8 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#29 0x00007f16010c67db in QETWidget::translateMouseEvent (this=this@entry=0x4078430, event=event@entry=0x7fff919c4fe0) at kernel/qapplication_x11.cpp:4631
#30 0x00007f16010c5642 in QApplication::x11ProcessEvent (this=0x259f2b0, event=event@entry=0x7fff919c4fe0) at kernel/qapplication_x11.cpp:3746
#31 0x00007f16010ed922 in x11EventSourceDispatch (s=0x25a5f60, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#32 0x00007f15f84713b6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007f15f8471708 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#34 0x00007f15f84717ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007f1601cdba55 in QEventDispatcherGlib::processEvents (this=0x2519ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#36 0x00007f16010ed9d6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#37 0x00007f1601cad5ef in QEventLoop::processEvents (this=this@entry=0x7fff919c53c0, flags=...) at kernel/qeventloop.cpp:149
#38 0x00007f1601cad8e5 in QEventLoop::exec (this=this@entry=0x7fff919c53c0, flags=...) at kernel/qeventloop.cpp:204
#39 0x00007f1601cb2e5b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#40 0x00007f160104a34c in QApplication::exec () at kernel/qapplication.cpp:3828
#41 0x00007f160541927c in kdemain (argc=1, argv=0x7fff919c5618) at ../../../../plasma/desktop/shell/main.cpp:126
#42 0x00007f1605036de5 in __libc_start_main (main=0x4006e0 <main(int, char**)>, argc=1, ubp_av=0x7fff919c5618, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff919c5608) at libc-start.c:260
#43 0x000000000040070e in _start ()

The reporter indicates this bug may be a duplicate of or related to bug 326842.

Possible duplicates by query: bug 327576, bug 326842, bug 326423, bug 325733, bug 325732.

Reported using DrKonqi