Application: kwin (4.10.2)
KDE Platform Version: 4.10.2
Qt Version: 4.8.4
Operating System: Linux 3.8.0-23-generic x86_64
Distribution: Ubuntu 13.04

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

- Unusual behavior I noticed:

- Custom settings of the application:

Support:
Kwin crashed- Kubuntu is a new in my pc and Kwin crashed.
Need a help for solutions problem

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 0x7fd51dc5c7c0 (LWP 2536))]

Thread 3 (Thread 0x7fd501852700 (LWP 2541)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fd518779694 in _q_futex (timeout=0x0, val=2, op=0, addr=0x1446880, addr2=<optimized out>, val2=<optimized out>) at thread/qmutex_unix.cpp:99
#2  QMutexPrivate::wait (this=this@entry=0x1446880, timeout=timeout@entry=-1) at thread/qmutex_unix.cpp:113
#3  0x00007fd5187758a5 in QMutex::lockInternal (this=<optimized out>) at thread/qmutex.cpp:450
#4  0x00007fd5199c40ac in KActivities::Consumer::listActivities() const () from /usr/lib/libkactivities.so.6
#5  0x00007fd51d779604 in KWin::fetchActivityListAndCurrent (controller=0x1446948) at ../../kwin/workspace.cpp:1405
#6  0x00007fd51d784fa3 in QtConcurrent::StoredFunctorCall1<QPair<QString, QStringList>, QPair<QString, QStringList> (*)(KActivities::Controller*), KActivities::Controller*>::runFunctor (this=0x14f3030) at /usr/include/qt4/QtCore/qtconcurrentstoredfunctioncall.h:267
#7  0x00007fd51d789466 in QtConcurrent::RunFunctionTask<QPair<QString, QStringList> >::run (this=0x14f3030) at /usr/include/qt4/QtCore/qtconcurrentrunbase.h:106
#8  0x00007fd51876e55d in QThreadPoolThread::run (this=0x14548e0) at concurrent/qthreadpool.cpp:107
#9  0x00007fd51877abec in QThreadPrivate::start (arg=0x14548e0) at thread/qthread_unix.cpp:338
#10 0x00007fd511090f8e in start_thread (arg=0x7fd501852700) at pthread_create.c:311
#11 0x00007fd51d46ae1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7fd500e3b700 (LWP 2542)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd519d5ae77 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007fd519d5aea9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007fd511090f8e in start_thread (arg=0x7fd500e3b700) at pthread_create.c:311
#4  0x00007fd51d46ae1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7fd51dc5c7c0 (LWP 2536)):
[KCrash Handler]
#6  QObject::property (this=0x0, name=name@entry=0x7fd500e4ccff "alpha") at kernel/qobject.cpp:3733
#7  0x00007fd500e4386b in Aurorae::AuroraeClient::slotAlphaChanged (this=this@entry=0x14f6650) at ../../../../../kwin/clients/aurorae/src/aurorae.cpp:568
#8  0x00007fd500e461c7 in Aurorae::AuroraeClient::init (this=0x14f6650) at ../../../../../kwin/clients/aurorae/src/aurorae.cpp:280
#9  0x00007fd51d790cce in updateDecoration (force=<optimized out>, check_workspace_pos=<optimized out>, this=0x14fa930) at ../../kwin/client.cpp:441
#10 KWin::Client::updateDecoration (this=this@entry=0x14fa930, check_workspace_pos=check_workspace_pos@entry=false, force=force@entry=false) at ../../kwin/client.cpp:422
#11 0x00007fd51d7bb671 in KWin::Client::manage (this=this@entry=0x14fa930, w=w@entry=65011730, isMapped=isMapped@entry=true) at ../../kwin/manage.cpp:356
#12 0x00007fd51d77db34 in KWin::Workspace::createClient (this=this@entry=0x1446900, w=65011730, is_mapped=is_mapped@entry=true) at ../../kwin/workspace.cpp:578
#13 0x00007fd51d783029 in KWin::Workspace::init (this=this@entry=0x1446900) at ../../kwin/workspace.cpp:457
#14 0x00007fd51d784290 in KWin::Workspace::Workspace (this=0x1446900, restore=<optimized out>) at ../../kwin/workspace.cpp:245
#15 0x00007fd51d79f220 in KWin::Application::Application (this=<optimized out>) at ../../kwin/main.cpp:325
#16 0x00007fd51d7a0d0e in kdemain (argc=3, argv=0x7ffff84b7948) at ../../kwin/main.cpp:513
#17 0x00007fd51d392ea5 in __libc_start_main (main=0x4006d0 <main(int, char**)>, argc=3, ubp_av=0x7ffff84b7948, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffff84b7938) at libc-start.c:260
#18 0x0000000000400701 in _start ()

Possible duplicates by query: bug 319140, bug 318941.

Reported using DrKonqi