Application: kwin (4.8.5 (4.8.5))
KDE Platform Version: 4.8.5 (4.8.5)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-51-generic x86_64
Distribution: Ubuntu 12.04.2 LTS

-- Information about the crash:
Bom, toda vez que desligo o Kubuntu uma alerta de erro aparece. Tal alerta impede que o sistema se deslique, sendo nessesario clicar em "fechar" para que o sistea relmente desligue.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f9cb2c2c780 (LWP 1952))]

Thread 3 (Thread 0x7f9c9679f700 (LWP 1954)):
#0  0x00007f9cb2440033 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f9cadc38366 in qt_safe_select (nfds=18, fdread=0x7f9c88000ac8, fdwrite=0x7f9c88000d60, fdexcept=0x7f9c88000ff8, orig_timeout=<optimized out>) at kernel/qcore_unix.cpp:83
#2  0x00007f9cadc3d7b2 in QEventDispatcherUNIXPrivate::doSelect (this=0x7f9c88000910, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:223
#3  0x00007f9cadc3dca3 in QEventDispatcherUNIX::processEvents (this=0x7f9c880008f0, flags=...) at kernel/qeventdispatcher_unix.cpp:926
#4  0x00007f9cadc0ac82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f9cadc0aed7 in QEventLoop::exec (this=0x7f9c9679edd0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f9cadb09fa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007f9cadbea9ff in QInotifyFileSystemWatcherEngine::run (this=0xff1670) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f9cadb0cfcb in QThreadPrivate::start (arg=0xff1670) at thread/qthread_unix.cpp:298
#9  0x00007f9ca6d31e9a in start_thread (arg=0x7f9c9679f700) at pthread_create.c:308
#10 0x00007f9cb2446ccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f9c95f9e700 (LWP 1955)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9caeefb222 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f9caeefb259 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f9ca6d31e9a in start_thread (arg=0x7f9c95f9e700) at pthread_create.c:308
#4  0x00007f9cb2446ccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f9cb2c2c780 (LWP 1952)):
[KCrash Handler]
#6  0x00007f9cadf618e0 in QString::shared_null () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007f9cb27de92a in KWin::Deleted::copyToDeleted (this=0x1198b10, c=0x1426e10) at ../../kwin/deleted.cpp:78
#8  0x00007f9cb27debad in KWin::Deleted::create (c=0x1426e10) at ../../kwin/deleted.cpp:53
#9  0x00007f9cb27c0570 in KWin::Unmanaged::release (this=0x1426e10) at ../../kwin/unmanaged.cpp:85
#10 0x00007f9cb2758ced in KWin::Workspace::~Workspace (this=0xfb75b0, __in_chrg=<optimized out>) at ../../kwin/workspace.cpp:533
#11 0x00007f9cb2759559 in KWin::Workspace::~Workspace (this=0xfb75b0, __in_chrg=<optimized out>) at ../../kwin/workspace.cpp:563
#12 0x00007f9cb2770305 in KWin::Application::~Application (this=0x7fff6f6d55c0, __in_chrg=<optimized out>) at ../../kwin/main.cpp:340
#13 0x00007f9cb2772c94 in kdemain (argc=<optimized out>, argv=<optimized out>) at ../../kwin/main.cpp:541
#14 0x00007f9cb237476d in __libc_start_main (main=0x400630 <main(int, char**)>, argc=1, ubp_av=0x7fff6f6d5ce8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff6f6d5cd8) at libc-start.c:226
#15 0x0000000000400661 in _start ()

Reported using DrKonqi