Application: kwin (4.11.3)
KDE Platform Version: 4.11.3 (Compiled from sources)
Qt Version: 4.8.6
Operating System: Linux 3.11-2-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

-- Information about the crash:
- What I was doing when the application crashed:
use opengl 3.1 in system preferences-desktop effects

- Unusual behavior I noticed:
appears immediately the error message kde

- Custom settings of the application:

I just wanted to try opengl 3.1 and left my assistant failures kde

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f75e9e4a780 (LWP 3721))]

Thread 3 (Thread 0x7f75bfdac700 (LWP 3726)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f75e8831a4b in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f75e8831a89 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f75e1de3e0e in start_thread (arg=0x7f75bfdac700) at pthread_create.c:311
#4  0x00007f75e96300fd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7f75cd1ff700 (LWP 9984)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007f75e42fa4b4 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f75e42ed8e5 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3  0x00007f75e42f9fef in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007f75e1de3e0e in start_thread (arg=0x7f75cd1ff700) at pthread_create.c:311
#5  0x00007f75e96300fd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7f75e9e4a780 (LWP 3721)):
[KCrash Handler]
#5  0x00007f75e957c1d5 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#6  0x00007f75e957f388 in __GI_abort () at abort.c:90
#7  0x00007f75e9575252 in __assert_fail_base (fmt=0x7f75d33fc6f4 "%s%s%s:%u: %s%sLa declaraci\303\263n `%s' no se cumple.\n%n", assertion=assertion@entry=0x7f75e748cc10 "!xcb_xlib_threads_sequence_lost", file=file@entry=0x7f75e748ca5b "../../src/xcb_io.c", line=line@entry=274, function=function@entry=0x7f75e748cf16 "poll_for_event") at assert.c:92
#8  0x00007f75e9575302 in __GI___assert_fail (assertion=0x7f75e748cc10 "!xcb_xlib_threads_sequence_lost", file=0x7f75e748ca5b "../../src/xcb_io.c", line=274, function=0x7f75e748cf16 "poll_for_event") at assert.c:101
#9  0x00007f75e741d3d9 in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#10 0x00007f75e741d46e in ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#11 0x00007f75e741d74d in _XEventsQueued () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#12 0x00007f75e7420405 in _XGetRequest () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#13 0x00007f75e4ef5307 in ?? () from /usr/lib/x86_64-linux-gnu/libGL.so.1
#14 0x00007f75e4ef2e3b in ?? () from /usr/lib/x86_64-linux-gnu/libGL.so.1
#15 0x00007f753eed470d in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#16 0x00007f753eed4a13 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#17 0x00007f753eed55f3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#18 0x00007f753ef6f476 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#19 0x00007f75e4ef465f in ?? () from /usr/lib/x86_64-linux-gnu/libGL.so.1
#20 0x00007f75e4ecf1d3 in glXMakeCurrentReadSGI () from /usr/lib/x86_64-linux-gnu/libGL.so.1
#21 0x00007f75e99d2419 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#22 0x00007f75e99d3f59 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#23 0x00007f75e99cec5e in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#24 0x00007f75e99b3cb5 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#25 0x00007f75e993c975 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#26 0x00007f75e44104c8 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#27 0x00007f75e42eab08 in QFutureWatcherBase::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#28 0x00007f75e379c75c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#29 0x00007f75e37a2dd0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#30 0x00007f75e828149a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#31 0x00007f75e43fc33d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#32 0x00007f75e43ff89f in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#33 0x00007f75e383b00c in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#34 0x00007f75e43faf9f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#35 0x00007f75e43fb295 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#36 0x00007f75e44008db in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#37 0x00007f75e996c506 in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#38 0x00007f75e9568995 in __libc_start_main (main=0x4006d0, argc=1, ubp_av=0x7fffeada8f78, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffeada8f68) at libc-start.c:276
#39 0x00000000004006fe in _start ()

Possible duplicates by query: bug 328004, bug 325166, bug 324255, bug 315521, bug 313655.

Reported using DrKonqi