Application: kwin (4.6.00 (4.6.0))
KDE Platform Version: 4.6.00 (4.6.0)
Qt Version: 4.7.0
Operating System: Linux 2.6.35-26-generic i686
Distribution: Ubuntu 10.10

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

Drag'n'drop a link from kopete chat window to firefox browser (to add a tab) using desktop switcher plasmoid. It happens not every time. Like just a freezing of a mouse when trying to move window to a group with middle mouse button.

The crash can be reproduced some of the time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7770720 (LWP 1791))]

Thread 2 (Thread 0xb4446b70 (LWP 1854)):
#0  0x007f6416 in __kernel_vsyscall ()
#1  0x060bb4dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x00a9ad9d in pthread_cond_wait () from /lib/libc.so.6
#3  0x01109877 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x12081a0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#4  0x011098c1 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x12081a0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#5  0x060b6cc9 in start_thread () from /lib/libpthread.so.0
#6  0x00a8d69e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb7770720 (LWP 1791)):
[KCrash Handler]
#7  0x043af2dd in QCoreApplicationPrivate::sendThroughApplicationEventFilters (this=0x93c8c48, receiver=0x98b3d38, event=0xbfc7b320) at kernel/qcoreapplication.cpp:818
#8  0x01c5df63 in QApplicationPrivate::notify_helper (this=0x93c8c48, receiver=0x98b3d38, e=0xbfc7b320) at kernel/qapplication.cpp:4371
#9  0x01c6451f in QApplication::notify (this=0xbfc7d594, receiver=0x97af6a0, e=0xbfc7b320) at kernel/qapplication.cpp:4202
#10 0x005f0f7a in KApplication::notify (this=0xbfc7d594, receiver=0x97af6a0, event=0xbfc7b320) at ../../kdeui/kernel/kapplication.cpp:311
#11 0x00eabd0f in KWin::Application::notify (this=0xbfc7d594, o=0x97af6a0, e=0xbfc7b320) at ../../kwin/main.cpp:376
#12 0x043afb3b in QCoreApplication::notifyInternal (this=0xbfc7d594, receiver=0x97af6a0, event=0xbfc7b320) at kernel/qcoreapplication.cpp:732
#13 0x01c6c6ce in QCoreApplication::sendEvent (receiver=0x97af6a0, event=0x98b3d38) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#14 0x01d00617 in handle_xdnd_position (w=<value optimized out>, xe=<value optimized out>, passive=false) at kernel/qdnd_x11.cpp:929
#15 0x01cdf808 in QApplication::x11ClientMessage (this=0xbfc7d594, w=0x97af6a0, event=0xbfc7b80c, passive_only=false) at kernel/qapplication_x11.cpp:3097
#16 0x01cf0af4 in QApplication::x11ProcessEvent (this=0xbfc7d594, event=0xbfc7b80c) at kernel/qapplication_x11.cpp:3668
#17 0x01d20fc7 in QEventDispatcherX11::processEvents (this=0x93aaba0, flags=...) at kernel/qeventdispatcher_x11.cpp:132
#18 0x043ae609 in QEventLoop::processEvents (this=0x9859210, flags=) at kernel/qeventloop.cpp:149
#19 0x043aea8a in QEventLoop::exec (this=0x9859210, flags=...) at kernel/qeventloop.cpp:201
#20 0x01d055f7 in QDragManager::drag (this=0x9430f20, o=0x9858fe0) at kernel/qdnd_x11.cpp:1981
#21 0x01c75d4e in QDrag::exec (this=0x9858fe0, supportedActions=..., defaultDropAction=Qt::IgnoreAction) at kernel/qdrag.cpp:284
#22 0x01c75e04 in QDrag::exec (this=0x9858fe0, supportedActions=...) at kernel/qdrag.cpp:239
#23 0x0416940c in Oxygen::Client::mouseMoveEvent (this=0x9808798, event=0xbfc7c0b0) at ../../../../kwin/clients/oxygen/oxygenclient.cpp:1523
#24 0x04163de7 in Oxygen::Client::eventFilter (this=0x9808798, object=0x98b3d38, event=0xbfc7c0b0) at ../../../../kwin/clients/oxygen/oxygenclient.cpp:1236
#25 0x043af29a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x93c8c48, receiver=0x98b3d38, event=0xbfc7c0b0) at kernel/qcoreapplication.cpp:847
#26 0x01c5dfb9 in QApplicationPrivate::notify_helper (this=0x93c8c48, receiver=0x98b3d38, e=0xbfc7c0b0) at kernel/qapplication.cpp:4392
#27 0x01c64c2e in QApplication::notify (this=0xbfc7d594, receiver=0x98b3d38, e=0xbfc7c0b0) at kernel/qapplication.cpp:3959
#28 0x005f0f7a in KApplication::notify (this=0xbfc7d594, receiver=0x98b3d38, event=0xbfc7c0b0) at ../../kdeui/kernel/kapplication.cpp:311
#29 0x00eabd0f in KWin::Application::notify (this=0xbfc7d594, o=0x98b3d38, e=0xbfc7c0b0) at ../../kwin/main.cpp:376
#30 0x043afb3b in QCoreApplication::notifyInternal (this=0xbfc7d594, receiver=0x98b3d38, event=0xbfc7c0b0) at kernel/qcoreapplication.cpp:732
#31 0x01c63094 in sendEvent (receiver=0x98b3d38, event=0xbfc7c0b0, alienWidget=0x0, nativeWidget=0x98b3d38, buttonDown=0x25f83c0, lastMouseReceiver=..., spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#32 QApplicationPrivate::sendMouseEvent (receiver=0x98b3d38, event=0xbfc7c0b0, alienWidget=0x0, nativeWidget=0x98b3d38, buttonDown=0x25f83c0, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3058
#33 0x01cf1d10 in QETWidget::translateMouseEvent (this=0x98b3d38, event=0xbfc7c5cc) at kernel/qapplication_x11.cpp:4403
#34 0x01cf1151 in QApplication::x11ProcessEvent (this=0xbfc7d594, event=0xbfc7c5cc) at kernel/qapplication_x11.cpp:3414
#35 0x01d20fc7 in QEventDispatcherX11::processEvents (this=0x93aaba0, flags=...) at kernel/qeventdispatcher_x11.cpp:132
#36 0x043ae609 in QEventLoop::processEvents (this=0x9898588, flags=) at kernel/qeventloop.cpp:149
#37 0x043aea8a in QEventLoop::exec (this=0x9898588, flags=...) at kernel/qeventloop.cpp:201
#38 0x01d055f7 in QDragManager::drag (this=0x9430f20, o=0x98e7698) at kernel/qdnd_x11.cpp:1981
#39 0x01c75d4e in QDrag::exec (this=0x98e7698, supportedActions=..., defaultDropAction=Qt::IgnoreAction) at kernel/qdrag.cpp:284
#40 0x01c75e04 in QDrag::exec (this=0x98e7698, supportedActions=...) at kernel/qdrag.cpp:239
#41 0x0416940c in Oxygen::Client::mouseMoveEvent (this=0x98988b0, event=0xbfc7ce70) at ../../../../kwin/clients/oxygen/oxygenclient.cpp:1523
#42 0x04163de7 in Oxygen::Client::eventFilter (this=0x98988b0, object=0x97ccf68, event=0xbfc7ce70) at ../../../../kwin/clients/oxygen/oxygenclient.cpp:1236
#43 0x043af29a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x93c8c48, receiver=0x97ccf68, event=0xbfc7ce70) at kernel/qcoreapplication.cpp:847
#44 0x01c5dfb9 in QApplicationPrivate::notify_helper (this=0x93c8c48, receiver=0x97ccf68, e=0xbfc7ce70) at kernel/qapplication.cpp:4392
#45 0x01c64c2e in QApplication::notify (this=0xbfc7d594, receiver=0x97ccf68, e=0xbfc7ce70) at kernel/qapplication.cpp:3959
#46 0x005f0f7a in KApplication::notify (this=0xbfc7d594, receiver=0x97ccf68, event=0xbfc7ce70) at ../../kdeui/kernel/kapplication.cpp:311
#47 0x00eabd0f in KWin::Application::notify (this=0xbfc7d594, o=0x97ccf68, e=0xbfc7ce70) at ../../kwin/main.cpp:376
#48 0x043afb3b in QCoreApplication::notifyInternal (this=0xbfc7d594, receiver=0x97ccf68, event=0xbfc7ce70) at kernel/qcoreapplication.cpp:732
#49 0x01c63094 in sendEvent (receiver=0x97ccf68, event=0xbfc7ce70, alienWidget=0x0, nativeWidget=0x97ccf68, buttonDown=0x25f83c0, lastMouseReceiver=..., spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#50 QApplicationPrivate::sendMouseEvent (receiver=0x97ccf68, event=0xbfc7ce70, alienWidget=0x0, nativeWidget=0x97ccf68, buttonDown=0x25f83c0, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3058
#51 0x01cf1d10 in QETWidget::translateMouseEvent (this=0x97ccf68, event=0xbfc7d38c) at kernel/qapplication_x11.cpp:4403
#52 0x01cf1151 in QApplication::x11ProcessEvent (this=0xbfc7d594, event=0xbfc7d38c) at kernel/qapplication_x11.cpp:3414
#53 0x01d20fc7 in QEventDispatcherX11::processEvents (this=0x93aaba0, flags=...) at kernel/qeventdispatcher_x11.cpp:132
#54 0x043ae609 in QEventLoop::processEvents (this=0xbfc7d4c4, flags=) at kernel/qeventloop.cpp:149
#55 0x043aea8a in QEventLoop::exec (this=0xbfc7d4c4, flags=...) at kernel/qeventloop.cpp:201
#56 0x043b300f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#57 0x01c5ce07 in QApplication::exec () at kernel/qapplication.cpp:3672
#58 0x00eaed00 in kdemain (argc=3, argv=0xbfc7d814) at ../../kwin/main.cpp:542
#59 0x080485ab in main (argc=3, argv=0xbfc7d814) at kwin_dummy.cpp:3

Possible duplicates by query: bug 261776, bug 261272, bug 249143, bug 226364.

Reported using DrKonqi