Application: kmail (4.7.3)
KDE Platform Version: 4.7.4 (4.7.4)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-15-generic i686
Distribution: Ubuntu 11.10

-- Information about the crash:
I had just completed a mail check, and clicked on the first of the emails I'd received to open it - 2 or 3 windows opened concurrently, kmail hung and died.

The crash can be reproduced some of the time.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[Current thread is 1 (Thread 0xb6144730 (LWP 12301))]

Thread 4 (Thread 0xb5003b70 (LWP 12307)):
#0  0x005e2416 in __kernel_vsyscall ()
#1  0x08875a5c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0x00cddcfc in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0xb7182883 in ?? () from /usr/lib/i386-linux-gnu/libQtWebKit.so.4
#4  0xb718299f in ?? () from /usr/lib/i386-linux-gnu/libQtWebKit.so.4
#5  0x08871d31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0x00cd00ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 3 (Thread 0xb46dab70 (LWP 12308)):
#0  0x08873dbd in pthread_mutex_lock () from /lib/i386-linux-gnu/libpthread.so.0
#1  0x00cddf14 in pthread_mutex_lock () from /lib/i386-linux-gnu/libc.so.6
#2  0x01ffd933 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0x01ffdc2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0x0358cb37 in QEventDispatcherGlib::processEvents (this=0x9e56708, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#5  0x0355d1dd in QEventLoop::processEvents (this=0xb46da2c0, flags=...) at kernel/qeventloop.cpp:149
#6  0x0355d421 in QEventLoop::exec (this=0xb46da2c0, flags=...) at kernel/qeventloop.cpp:201
#7  0x0346090b in QThread::exec (this=0x9e55d90) at thread/qthread.cpp:498
#8  0x034609fb in QThread::run (this=0x9e55d90) at thread/qthread.cpp:565
#9  0x034637b3 in QThreadPrivate::start (arg=0x9e55d90) at thread/qthread_unix.cpp:331
#10 0x08871d31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#11 0x00cd00ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 2 (Thread 0xb2c14b70 (LWP 12309)):
#0  0x005e2416 in __kernel_vsyscall ()
#1  0x00cc140e in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0x0200c34b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0x01ffd896 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0x01ffdc2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0x0358cb37 in QEventDispatcherGlib::processEvents (this=0x9ec8188, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0x0355d1dd in QEventLoop::processEvents (this=0xb2c14290, flags=...) at kernel/qeventloop.cpp:149
#7  0x0355d421 in QEventLoop::exec (this=0xb2c14290, flags=...) at kernel/qeventloop.cpp:201
#8  0x0346090b in QThread::exec (this=0x9e6b0f8) at thread/qthread.cpp:498
#9  0x0353de2d in QInotifyFileSystemWatcherEngine::run (this=0x9e6b0f8) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x034637b3 in QThreadPrivate::start (arg=0x9e6b0f8) at thread/qthread_unix.cpp:331
#11 0x08871d31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0x00cd00ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 1 (Thread 0xb6144730 (LWP 12301)):
[KCrash Handler]
#7  0x0355d2f7 in data (this=0x4) at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:135
#8  qGetPtrHelper<QScopedPointer<QObjectData> > (p=...) at ../../include/QtCore/../../src/corelib/global/qglobal.h:2343
#9  d_func (this=0x0) at ../../include/QtCore/../../src/corelib/kernel/qeventloop.h:58
#10 QEventLoop::exit (this=0x0, returnCode=0) at kernel/qeventloop.cpp:279
#11 0x00fbb5fc in QDragManager::eventFilter (this=0xa299360, o=0xa28ff00, e=0xbf9ad80c) at kernel/qdnd_x11.cpp:1333
#12 0x0355e26b in QCoreApplicationPrivate::sendThroughApplicationEventFilters (this=0x9a68b40, receiver=0xa28ff00, event=0xbf9ad80c) at kernel/qcoreapplication.cpp:883
#13 0x00f1ecfa in QApplicationPrivate::notify_helper (this=0x9a68b40, receiver=0xa28ff00, e=0xbf9ad80c) at kernel/qapplication.cpp:4461
#14 0x00f24deb in QApplication::notify (this=0x9a68b40, receiver=0xa28ff00, e=0xbf9ad80c) at kernel/qapplication.cpp:4047
#15 0x002f7971 in KApplication::notify (this=0xbf9af19c, receiver=0xa28ff00, event=0xbf9ad80c) at ../../kdeui/kernel/kapplication.cpp:311
#16 0x0355e19e in QCoreApplication::notifyInternal (this=0xbf9af19c, receiver=0xa28ff00, event=0xbf9ad80c) at kernel/qcoreapplication.cpp:787
#17 0x00f1fd45 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#18 QApplicationPrivate::sendMouseEvent (receiver=0xa28ff00, event=0xbf9ad80c, alienWidget=0x9cd5210, nativeWidget=0x9b14290, buttonDown=0x1889eb4, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3146
#19 0x00fac304 in QETWidget::translateMouseEvent (this=0x9b14290, event=0xbf9adc8c) at kernel/qapplication_x11.cpp:4571
#20 0x00faae8d in QApplication::x11ProcessEvent (this=0xbf9af19c, event=0xbf9adc8c) at kernel/qapplication_x11.cpp:3693
#21 0x00fd728c in x11EventSourceDispatch (s=0x9a6bd40, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#22 0x01ffd25f in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#23 0x01ffd990 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#24 0x01ffdc2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#25 0x0358cada in QEventDispatcherGlib::processEvents (this=0x9a31250, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00fd6e7a in QGuiEventDispatcherGlib::processEvents (this=0x9a31250, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x0355d1dd in QEventLoop::processEvents (this=0xa28f870, flags=...) at kernel/qeventloop.cpp:149
#28 0x0355d421 in QEventLoop::exec (this=0xa28f870, flags=...) at kernel/qeventloop.cpp:201
#29 0x00fbb3a8 in QDragManager::drag (this=0xa299360, o=0x9b24480) at kernel/qdnd_x11.cpp:1981
#30 0x00f326b1 in QDrag::exec (this=0x9b24480, supportedActions=..., defaultDropAction=Qt::IgnoreAction) at kernel/qdrag.cpp:284
#31 0x00f32755 in QDrag::exec (this=0x9b24480, supportedActions=...) at kernel/qdrag.cpp:239
#32 0x06d3ae86 in MessageList::Widget::viewStartDragRequest() () from /usr/lib/libmessagelist.so.4
#33 0x06d0c6da in MessageList::Core::View::mouseMoveEvent(QMouseEvent*) () from /usr/lib/libmessagelist.so.4
#34 0x00f79004 in QWidget::event (this=0x9d06ab0, event=0xbf9ae92c) at kernel/qwidget.cpp:8280
#35 0x0137e285 in QFrame::event (this=0x9d06ab0, e=0xbf9ae92c) at widgets/qframe.cpp:557
#36 0x01410821 in QAbstractScrollArea::viewportEvent (this=0x9d06ab0, e=0xbf9ae92c) at widgets/qabstractscrollarea.cpp:1043
#37 0x014b2bbc in QAbstractItemView::viewportEvent (this=0x9d06ab0, event=0xbf9ae92c) at itemviews/qabstractitemview.cpp:1628
#38 0x014fd376 in QTreeView::viewportEvent (this=0x9d06ab0, event=0xbf9ae92c) at itemviews/qtreeview.cpp:1256
#39 0x01412f36 in viewportEvent (this=<optimized out>, event=0xbf9ae92c) at widgets/qabstractscrollarea_p.h:100
#40 eventFilter (e=0xbf9ae92c, this=<optimized out>, o=<optimized out>) at widgets/qabstractscrollarea_p.h:116
#41 QAbstractScrollAreaFilter::eventFilter (this=0x9e28d58, o=0x9cd5210, e=0xbf9ae92c) at widgets/qabstractscrollarea_p.h:115
#42 0x0355e336 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x9a68b40, receiver=0x9cd5210, event=0xbf9ae92c) at kernel/qcoreapplication.cpp:902
#43 0x00f1ed52 in notify_helper (e=0xbf9ae92c, receiver=0x9cd5210, this=0x9a68b40) at kernel/qapplication.cpp:4482
#44 QApplicationPrivate::notify_helper (this=0x9a68b40, receiver=0x9cd5210, e=0xbf9ae92c) at kernel/qapplication.cpp:4458
#45 0x00f24deb in QApplication::notify (this=0x9a68b40, receiver=0x9cd5210, e=0xbf9ae92c) at kernel/qapplication.cpp:4047
#46 0x002f7971 in KApplication::notify (this=0xbf9af19c, receiver=0x9cd5210, event=0xbf9ae92c) at ../../kdeui/kernel/kapplication.cpp:311
#47 0x0355e19e in QCoreApplication::notifyInternal (this=0xbf9af19c, receiver=0x9cd5210, event=0xbf9ae92c) at kernel/qcoreapplication.cpp:787
#48 0x00f1fd45 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#49 QApplicationPrivate::sendMouseEvent (receiver=0x9cd5210, event=0xbf9ae92c, alienWidget=0x9cd5210, nativeWidget=0x9b14290, buttonDown=0x1889eb4, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3146
#50 0x00fac304 in QETWidget::translateMouseEvent (this=0x9b14290, event=0xbf9aedac) at kernel/qapplication_x11.cpp:4571
#51 0x00faae8d in QApplication::x11ProcessEvent (this=0xbf9af19c, event=0xbf9aedac) at kernel/qapplication_x11.cpp:3693
#52 0x00fd728c in x11EventSourceDispatch (s=0x9a6bd40, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#53 0x01ffd25f in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#54 0x01ffd990 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#55 0x01ffdc2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#56 0x0358cada in QEventDispatcherGlib::processEvents (this=0x9a31250, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#57 0x00fd6e7a in QGuiEventDispatcherGlib::processEvents (this=0x9a31250, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#58 0x0355d1dd in QEventLoop::processEvents (this=0xbf9af0b4, flags=...) at kernel/qeventloop.cpp:149
#59 0x0355d421 in QEventLoop::exec (this=0xbf9af0b4, flags=...) at kernel/qeventloop.cpp:201
#60 0x0356219d in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#61 0x00f1c924 in QApplication::exec () at kernel/qapplication.cpp:3760
#62 0x0804a266 in ?? ()
#63 0x00c17113 in __libc_start_main () from /lib/i386-linux-gnu/libc.so.6
#64 0x0804a709 in _start ()

Reported using DrKonqi