Application: kwin (4.7.00 (4.7.0))
KDE Platform Version: 4.7.00 (4.7.0)
Qt Version: 4.7.2
Operating System: Linux 3.0.0-999-generic x86_64
Distribution: Ubuntu 11.04

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

Drad and droped a firefox windows with midle button to create a new window tab, than tried switching window tab clicking the window tab title.

- Unusual behavior I noticed:

kwin crashed

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f9694fcf7a0 (LWP 21006))]

Thread 3 (Thread 0x7f96767f4700 (LWP 21012)):
#0  0x00007f9694824143 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f9690c0b32c in qt_safe_select (nfds=19, fdread=0x2905440, fdwrite=0x29056d8, fdexcept=0x2905970, orig_timeout=<value optimized out>) at kernel/qcore_unix.cpp:82
#2  0x00007f9690c103d0 in QEventDispatcherUNIXPrivate::doSelect (this=0x2905280, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:219
#3  0x00007f9690c1104a in QEventDispatcherUNIX::processEvents (this=0x2904dc0, flags=...) at kernel/qeventdispatcher_unix.cpp:919
#4  0x00007f9690be2882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f9690be2abc in QEventLoop::exec (this=0x7f96767f3db0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f9690af9924 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:492
#7  0x00007f9690bc4c2f in QInotifyFileSystemWatcherEngine::run (this=0x26b5620) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f9690afc175 in QThreadPrivate::start (arg=0x26b5620) at thread/qthread_unix.cpp:320
#9  0x00007f968b1fcd8c in start_thread (arg=0x7f96767f4700) at pthread_create.c:304
#10 0x00007f969482c04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f9675ff3700 (LWP 21013)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f969368c2a2 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f96939a5180) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f969368c2d9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x7f96939b3254) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f968b1fcd8c in start_thread (arg=0x7f9675ff3700) at pthread_create.c:304
#4  0x00007f969482c04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f9694fcf7a0 (LWP 21006)):
[KCrash Handler]
#6  0x00007f9693cf9b22 in Plasma::Corona::popupPosition (this=0x3fee590, item=<value optimized out>, s=..., alignment=<value optimized out>) at ../../plasma/corona.cpp:607
#7  0x00007f9693d9f1c4 in Plasma::ToolTipManagerPrivate::showToolTip (this=0x2a4f6f0) at ../../plasma/tooltipmanager.cpp:406
#8  0x00007f9693d9f565 in Plasma::ToolTipManager::qt_metacall (this=0x2a4f870, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff068a9580) at ./tooltipmanager.moc:88
#9  0x00007f9690bf85f8 in QMetaObject::activate (sender=0x2a4ed30, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3287
#10 0x00007f9690bf71c9 in QObject::event (this=0x2a4ed30, e=<value optimized out>) at kernel/qobject.cpp:1190
#11 0x00007f968ffa09f4 in QApplicationPrivate::notify_helper (this=0xfd61e0, receiver=0x2a4ed30, e=0x7fff068a9c80) at kernel/qapplication.cpp:4462
#12 0x00007f968ffa53ba in QApplication::notify (this=<value optimized out>, receiver=0x2a4ed30, e=0x7fff068a9c80) at kernel/qapplication.cpp:4341
#13 0x00007f969431a796 in KApplication::notify (this=0x7fff068aa080, receiver=0x2a4ed30, event=0x7fff068a9c80) at ../../kdeui/kernel/kapplication.cpp:311
#14 0x00007f9690be349c in QCoreApplication::notifyInternal (this=0x7fff068aa080, receiver=0x2a4ed30, event=0x7fff068a9c80) at kernel/qcoreapplication.cpp:731
#15 0x00007f9690c10f12 in sendEvent (this=0xfd6da0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#16 QTimerInfoList::activateTimers (this=0xfd6da0) at kernel/qeventdispatcher_unix.cpp:604
#17 0x00007f9690c1105b in QEventDispatcherUNIX::processEvents (this=0xf602e0, flags=...) at kernel/qeventdispatcher_unix.cpp:923
#18 0x00007f969004b2ec in QEventDispatcherX11::processEvents (this=0xf602e0, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#19 0x00007f9690be2882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#20 0x00007f9690be2abc in QEventLoop::exec (this=0x7fff068a9fc0, flags=...) at kernel/qeventloop.cpp:201
#21 0x00007f9690be6ecb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#22 0x00007f9694b34bfe in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#23 0x00007f9694764eff in __libc_start_main (main=0x400730 <_start+256>, argc=3, ubp_av=0x7fff068aa6e8, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff068aa6d8) at libc-start.c:226
#24 0x0000000000400659 in _start ()

This bug may be a duplicate of or related to bug 258925, bug 274581.

Possible duplicates by query: bug 277135, bug 275183, bug 274748, bug 274581, bug 273579.

Reported using DrKonqi