Application: kate (3.5.1)
KDE Platform Version: 4.5.1 (KDE 4.5.1)
Qt Version: 4.7.0
Operating System: Linux 2.6.38-4-generic-pae i686
Distribution: Ubuntu 10.10

-- Information about the crash:
In the kate browser-sidebar, while browsing an sftp-resource, I accidentally instead of clicking, initiated a drag-n-drop operation of a folder on the sftp-side. I immediately dropped the folder onto itself, which caused the crash.

This has happened before, sometimes krasching kate, but I don't think it's 100%.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Kate (kate), signal: Segmentation fault
[Current thread is 1 (Thread 0xb4f0b930 (LWP 5068))]

Thread 4 (Thread 0xb1d47b70 (LWP 5069)):
#0  0xb777c424 in __kernel_vsyscall ()
#1  0xb76d60f3 in __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:95
#2  0xb766a65f in _L_lock_9687 () from /lib/libc.so.6
#3  0xb7668e56 in __libc_free (mem=0x9a2f270) at malloc.c:3736
#4  0xb5f7d486 in g_free () from /lib/libglib-2.0.so.0
#5  0xb5f775e7 in g_main_context_unref () from /lib/libglib-2.0.so.0
#6  0xb62e522d in QEventDispatcherGlib::~QEventDispatcherGlib (this=0x9a2f608, __in_chrg=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:392
#7  0xb61b35ba in QThreadPrivate::finish (arg=0xb63e9888) at thread/qthread_unix.cpp:302
#8  0xb61b3e01 in ~__pthread_cleanup_class (arg=0xb63e9888) at /usr/include/pthread.h:545
#9  QThreadPrivate::start (arg=0xb63e9888) at thread/qthread_unix.cpp:271
#10 0xb6022cc9 in start_thread (arg=0xb1d47b70) at pthread_create.c:304
#11 0xb76c869e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 3 (Thread 0xafbbfb70 (LWP 5116)):
#0  0xb777c424 in __kernel_vsyscall ()
#1  0xb76d60f3 in __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:95
#2  0xb766a65f in _L_lock_9687 () from /lib/libc.so.6
#3  0xb7668e56 in __libc_free (mem=0x9ace438) at malloc.c:3736
#4  0xb6111441 in operator delete(void*) () from /usr/lib/libstdc++.so.6
#5  0xb62e50b5 in QEventDispatcherGlib::unregisterSocketNotifier (this=0x9aea8d0, notifier=0xafbbf2ec) at kernel/qeventdispatcher_glib.cpp:496
#6  0xb62d31da in QSocketNotifier::setEnabled (this=0xfffffe00, enable=false) at kernel/qsocketnotifier.cpp:298
#7  0xb62e4a02 in socketNotifierSourceCheck (source=0x9aeed00) at kernel/qeventdispatcher_glib.cpp:92
#8  0xb5f77b39 in g_main_context_check () from /lib/libglib-2.0.so.0
#9  0xb5f7845e in ?? () from /lib/libglib-2.0.so.0
#10 0xb5f78848 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#11 0xb62e4565 in QEventDispatcherGlib::processEvents (this=0x9aea8d0, flags=...) at kernel/qeventdispatcher_glib.cpp:415
#12 0xb62b4609 in QEventLoop::processEvents (this=0xafbbf290, flags=) at kernel/qeventloop.cpp:149
#13 0xb62b4a8a in QEventLoop::exec (this=0xafbbf290, flags=...) at kernel/qeventloop.cpp:201
#14 0xb61b0b7e in QThread::exec (this=0x9aee150) at thread/qthread.cpp:490
#15 0xb629335b in QInotifyFileSystemWatcherEngine::run (this=0x9aee150) at io/qfilesystemwatcher_inotify.cpp:248
#16 0xb61b3df9 in QThreadPrivate::start (arg=0x9aee150) at thread/qthread_unix.cpp:266
#17 0xb6022cc9 in start_thread (arg=0xafbbfb70) at pthread_create.c:304
#18 0xb76c869e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 2 (Thread 0xaee7cb70 (LWP 5508)):
#0  0xb777c424 in __kernel_vsyscall ()
#1  0xb60274dc in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:169
#2  0xb76d5d9d in __pthread_cond_wait (cond=0xb261c290, mutex=0xb261c278) at forward.c:139
#3  0xb2518877 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0xb26171a0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#4  0xb25188c1 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0xb26171a0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#5  0xb6022cc9 in start_thread (arg=0xaee7cb70) at pthread_create.c:304
#6  0xb76c869e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb4f0b930 (LWP 5068)):
[KCrash Handler]
#7  _int_malloc (av=<value optimized out>, bytes=<value optimized out>) at malloc.c:4339
#8  0xb7668f33 in __libc_malloc (bytes=16) at malloc.c:3660
#9  0xb6113619 in operator new(unsigned int) () from /usr/lib/libstdc++.so.6
#10 0xb6e22442 in QRegion::QRegion (this=0xbf8da3f4, r=..., t=QRegion::Rectangle) at painting/qregion.cpp:3833
#11 0xb6eb0697 in QWidgetBackingStore::markDirty (this=0x971f090, rect=..., widget=0x97d2708, updateImmediately=false, invalidateBuffer=false) at painting/qbackingstore.cpp:691
#12 0xb6cb20f6 in QWidget::update (this=0x97d2708, rect=...) at kernel/qwidget.cpp:10322
#13 0xb6cb21bc in QWidget::update (this=0x97d2708) at kernel/qwidget.cpp:10294
#14 0xb6cb876a in QWidget::event (this=0x97d2708, event=0xbf8db644) at kernel/qwidget.cpp:8438
#15 0xb6c59fdc in QApplicationPrivate::notify_helper (this=0x94ef608, receiver=0x97d2708, e=0xbf8db644) at kernel/qapplication.cpp:4396
#16 0xb6c600e9 in QApplication::notify (this=0xbf8dbe1c, receiver=0x97d2708, e=0xbf8db644) at kernel/qapplication.cpp:4361
#17 0xb663e68a in KApplication::notify (this=0xbf8dbe1c, receiver=0x97d2708, event=0xbf8db644) at ../../kdeui/kernel/kapplication.cpp:310
#18 0xb62b5b3b in QCoreApplication::notifyInternal (this=0xbf8dbe1c, receiver=0x97d2708, event=0xbf8db644) at kernel/qcoreapplication.cpp:732
#19 0xb6cb7ec5 in sendEvent (this=0x97bca50, event=0xbf8db644) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#20 QWidget::event (this=0x97bca50, event=0xbf8db644) at kernel/qwidget.cpp:8443
#21 0xb7167d87 in QToolBar::event (this=0x97bca50, event=0xbf8db644) at widgets/qtoolbar.cpp:1248
#22 0xb6c59fdc in QApplicationPrivate::notify_helper (this=0x94ef608, receiver=0x97bca50, e=0xbf8db644) at kernel/qapplication.cpp:4396
#23 0xb6c600e9 in QApplication::notify (this=0xbf8dbe1c, receiver=0x97bca50, e=0xbf8db644) at kernel/qapplication.cpp:4361
#24 0xb663e68a in KApplication::notify (this=0xbf8dbe1c, receiver=0x97bca50, event=0xbf8db644) at ../../kdeui/kernel/kapplication.cpp:310
#25 0xb62b5b3b in QCoreApplication::notifyInternal (this=0xbf8dbe1c, receiver=0x97bca50, event=0xbf8db644) at kernel/qcoreapplication.cpp:732
#26 0xb6cb7ec5 in sendEvent (this=0x9709158, event=0xbf8db644) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#27 QWidget::event (this=0x9709158, event=0xbf8db644) at kernel/qwidget.cpp:8443
#28 0xb70f8917 in QMainWindow::event (this=0x9709158, event=0xbf8db644) at widgets/qmainwindow.cpp:1417
#29 0xb67348a4 in KMainWindow::event (this=0x9709158, ev=0xbf8db644) at ../../kdeui/widgets/kmainwindow.cpp:1100
#30 0xb677d14f in KXmlGuiWindow::event (this=0x9709158, ev=0xbf8db644) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:130
#31 0xb68584f4 in ?? () from /usr/lib/libkateinterfaces.so.4
#32 0xb6c59fdc in QApplicationPrivate::notify_helper (this=0x94ef608, receiver=0x9709158, e=0xbf8db644) at kernel/qapplication.cpp:4396
#33 0xb6c600e9 in QApplication::notify (this=0xbf8dbe1c, receiver=0x9709158, e=0xbf8db644) at kernel/qapplication.cpp:4361
#34 0xb663e68a in KApplication::notify (this=0xbf8dbe1c, receiver=0x9709158, event=0xbf8db644) at ../../kdeui/kernel/kapplication.cpp:310
#35 0xb62b5b3b in QCoreApplication::notifyInternal (this=0xbf8dbe1c, receiver=0x9709158, event=0xbf8db644) at kernel/qcoreapplication.cpp:732
#36 0xb6c645e6 in sendSpontaneousEvent (act=0x9709158) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#37 QApplication::setActiveWindow (act=0x9709158) at kernel/qapplication.cpp:2536
#38 0xb6cec877 in QApplication::x11ProcessEvent (this=0xbf8dbe1c, event=0xbf8dba1c) at kernel/qapplication_x11.cpp:3455
#39 0xb6d1c36a in x11EventSourceDispatch (s=0x94f2748, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#40 0xb5f74855 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#41 0xb5f78668 in ?? () from /lib/libglib-2.0.so.0
#42 0xb5f78848 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#43 0xb62e4565 in QEventDispatcherGlib::processEvents (this=0x94d0b58, flags=...) at kernel/qeventdispatcher_glib.cpp:415
#44 0xb6d1bbe5 in QGuiEventDispatcherGlib::processEvents (this=0x94d0b58, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#45 0xb62b4609 in QEventLoop::processEvents (this=0xbf8dbd14, flags=) at kernel/qeventloop.cpp:149
#46 0xb62b4a8a in QEventLoop::exec (this=0xbf8dbd14, flags=...) at kernel/qeventloop.cpp:201
#47 0xb62b900f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#48 0xb6c58e07 in QApplication::exec () at kernel/qapplication.cpp:3672
#49 0xb77747b7 in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_kate.so
#50 0x0804859b in _start ()

Reported using DrKonqi