Application: kwin (4.5.1 (KDE 4.5.1))
KDE Platform Version: 4.5.1 (KDE 4.5.1)
Qt Version: 4.7.0
Operating System: Linux 2.6.35-23-generic x86_64
Distribution: Ubuntu 10.10

-- Information about the crash:
- What I was doing when the application crashed:
I was messing around with the "Present Windows" desktop effect and pressed the + and - keys to find that doing so seemed to add and remove new instances of the desktop.

- Unusual behavior I noticed:
 Pressing - again when there was only one desktop left caused Kwin to immediately crash.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fd3ce25d7a0 (LWP 1816))]

Thread 2 (Thread 0x7fd3a94d9710 (LWP 1819)):
#0  0x00007fd3cdade2e3 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007fd3ca32476e in qt_safe_select (nfds=23, fdread=0x1e968e0, fdwrite=0x1e96b78, fdexcept=0x1e96e10, orig_timeout=0x0) at kernel/qcore_unix.cpp:82
#2  0x00007fd3ca329beb in QEventDispatcherUNIXPrivate::doSelect (this=0x1e96720, flags=<value optimized out>, timeout=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:219
#3  0x00007fd3ca32a81b in QEventDispatcherUNIX::processEvents (this=0x1e437b0, flags=) at kernel/qeventdispatcher_unix.cpp:919
#4  0x00007fd3ca2f9a02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#5  0x00007fd3ca2f9dec in QEventLoop::exec (this=0x7fd3a94d8cb0, flags=) at kernel/qeventloop.cpp:201
#6  0x00007fd3ca2042fd in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:490
#7  0x00007fd3ca2d95f8 in QInotifyFileSystemWatcherEngine::run (this=0x1e8dd80) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fd3ca20727e in QThreadPrivate::start (arg=0x1e8dd80) at thread/qthread_unix.cpp:266
#9  0x00007fd3cb82c953 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007fd3c9f7c971 in start_thread (arg=<value optimized out>) at pthread_create.c:304
#11 0x00007fd3cdae594d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fd3ce25d7a0 (LWP 1816)):
[KCrash Handler]
#6  0x00007fd3cde1c8d3 in KWin::Workspace::clientArea (this=0x177b990, opt=KWin::MaximizeArea, screen=1, desktop=1) at ../../kwin/geometry.cpp:261
#7  0x00007fd3cde1cb32 in KWin::Workspace::clientArea (this=0x177b990, opt=KWin::MaximizeArea, p=<value optimized out>, desktop=0) at ../../kwin/geometry.cpp:305
#8  0x00007fd3cde1d14c in KWin::Workspace::clientArea (this=0x177b990, opt=KWin::MaximizeArea, c=0x304d8e0) at ../../kwin/geometry.cpp:310
#9  0x00007fd3cde23251 in KWin::Client::changeMaximize (this=0x304d8e0, vertical=false, horizontal=false, adjust=true) at ../../kwin/geometry.cpp:2253
#10 0x00007fd3cde243d9 in KWin::Client::checkWorkspacePosition (this=0x304d8e0) at ../../kwin/geometry.cpp:1115
#11 0x00007fd3cde25eac in KWin::Workspace::updateClientArea (this=0x177b990, force=<value optimized out>) at ../../kwin/geometry.cpp:228
#12 0x00007fd3cddb9e5f in KWin::Workspace::setNumberOfDesktops (this=0x177b990, n=0) at ../../kwin/workspace.cpp:1724
#13 0x00007fd3b500ca35 in KWin::DesktopGridEffect::grabbedKeyboardEvent (this=0x1c9a160, e=0x7fff99ed0150) at ../../../kwin/effects/desktopgrid/desktopgrid.cpp:803
#14 0x00007fd3cddf6012 in KWin::Workspace::workspaceEvent (this=<value optimized out>, e=<value optimized out>) at ../../kwin/events.cpp:548
#15 0x00007fd3cddd323e in KWin::Application::notify (this=0x7fff99ed0f70, o=0x18475e0, e=0x1) at ../../kwin/main.cpp:370
#16 0x00007fd3ca2facdc in QCoreApplication::notifyInternal (this=0x7fff99ed0f70, receiver=0x18475e0, event=0x7fff99ed0150) at kernel/qcoreapplication.cpp:732
#17 0x00007fd3c94f24ba in QKeyMapper::sendKeyEvent (keyWidget=0x18475e0, grab=<value optimized out>, type=QEvent::KeyPress, code=45, modifiers=<value optimized out>, text=..., autorepeat=true, count=1, nativeScanCode=82, nativeVirtualKey=65453, nativeModifiers=16) at kernel/qkeymapper_x11.cpp:1867
#18 0x00007fd3c94f4ac0 in QKeyMapperPrivate::translateKeyEvent (this=0x7fff99ed0330, keyWidget=0x18475e0, event=<value optimized out>, grab=2) at kernel/qkeymapper_x11.cpp:1837
#19 0x00007fd3c94cbcb4 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fff99ed0d30) at kernel/qapplication_x11.cpp:3429
#20 0x00007fd3c94f8b6f in QEventDispatcherX11::processEvents (this=<value optimized out>, flags=) at kernel/qeventdispatcher_x11.cpp:132
#21 0x00007fd3ca2f9a02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#22 0x00007fd3ca2f9dec in QEventLoop::exec (this=0x7fff99ed0eb0, flags=) at kernel/qeventloop.cpp:201
#23 0x00007fd3ca2fdebb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#24 0x00007fd3cddd4f9d in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../kwin/main.cpp:531
#25 0x00007fd3cda1dd8e in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff99ed1578) at libc-start.c:226
#26 0x0000000000400669 in _start ()

Possible duplicates by query: bug 179309, bug 179153.

Reported using DrKonqi