Application: kwin (4.8.2 (4.8.2))
KDE Platform Version: 4.8.2 (4.8.2)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-24-generic x86_64
Distribution: Ubuntu 12.04 LTS

-- Information about the crash:
I'm using 3 virtual desktops.

Switched to one, which contains only one opened Konsole window with 2 tabs.
After that i was try to detach the second tab, then KWin crashed message appeared.

The reporting assistant find "duplicates" for this crash, but they are related to KDE 4.1.2 and 4.1.3

Related issues are:
#176001
#174118 (closed without real fix)

-- 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 0x7f8e02c5e780 (LWP 1781))]

Thread 3 (Thread 0x7f8ddffff700 (LWP 1818)):
#0  0x00007f8e0246e823 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f8dfdc70366 in qt_safe_select (nfds=20, fdread=0x7f8dd4000ac8, fdwrite=0x7f8dd4000d60, fdexcept=0x7f8dd4000ff8, orig_timeout=<optimized out>) at kernel/qcore_unix.cpp:83
#2  0x00007f8dfdc757b2 in QEventDispatcherUNIXPrivate::doSelect (this=0x7f8dd4000910, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:223
#3  0x00007f8dfdc75ca3 in QEventDispatcherUNIX::processEvents (this=0x7f8dd40008f0, flags=...) at kernel/qeventdispatcher_unix.cpp:926
#4  0x00007f8dfdc42c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f8dfdc42ed7 in QEventLoop::exec (this=0x7f8ddfffedd0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f8dfdb41fa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007f8dfdc229ff in QInotifyFileSystemWatcherEngine::run (this=0x234de50) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f8dfdb44fcb in QThreadPrivate::start (arg=0x234de50) at thread/qthread_unix.cpp:298
#9  0x00007f8df6d6fe9a in start_thread (arg=0x7f8ddffff700) at pthread_create.c:308
#10 0x00007f8e024754bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f8ddf7fe700 (LWP 1819)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f8dfef2e222 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f8dfef2e259 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f8df6d6fe9a in start_thread (arg=0x7f8ddf7fe700) at pthread_create.c:308
#4  0x00007f8e024754bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f8e02c5e780 (LWP 1781)):
[KCrash Handler]
#6  KWin::Placement::placeCascaded (this=0x2610960, c=0x2e182d0, area=..., nextPlacement=KWin::Placement::Smart) at ../../kwin/placement.cpp:341
#7  0x00007f8e027bc529 in KWin::Client::manage (this=<optimized out>, w=<optimized out>, isMapped=<optimized out>) at ../../kwin/manage.cpp:373
#8  0x00007f8e02781c82 in KWin::Workspace::createClient (this=0x1dcf930, w=52429156, is_mapped=false) at ../../kwin/workspace.cpp:569
#9  0x00007f8e027ac722 in KWin::Workspace::workspaceEvent (this=0x1dcf930, e=0x7fff418d7b70) at ../../kwin/events.cpp:358
#10 0x00007f8e0279e288 in KWin::Application::x11EventFilter (this=0x7fff418d7e80, e=0x7fff418d7b70) at ../../kwin/main.cpp:359
#11 0x00007f8dfd035b85 in qt_x11EventFilter (ev=0x7fff418d7b70) at kernel/qapplication_x11.cpp:441
#12 qt_x11EventFilter (ev=0x7fff418d7b70) at kernel/qapplication_x11.cpp:429
#13 0x00007f8dfd044f98 in QApplication::x11ProcessEvent (this=0x7fff418d7e80, event=0x7fff418d7b70) at kernel/qapplication_x11.cpp:3444
#14 0x00007f8dfd06fb3a in QEventDispatcherX11::processEvents (this=0x1cedad0, flags=...) at kernel/qeventdispatcher_x11.cpp:132
#15 0x00007f8dfdc42c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#16 0x00007f8dfdc42ed7 in QEventLoop::exec (this=0x7fff418d7dc0, flags=...) at kernel/qeventloop.cpp:204
#17 0x00007f8dfdc47f67 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#18 0x00007f8e027a0a06 in kdemain (argc=<optimized out>, argv=<optimized out>) at ../../kwin/main.cpp:541
#19 0x00007f8e023a476d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff418d85a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff418d8598) at libc-start.c:226
#20 0x0000000000400671 in _start ()

Possible duplicates by query: bug 176001, bug 174118.

Reported using DrKonqi