Application: kwin (4.5.00 (KDE 4.5.0))
KDE Platform Version: 4.5.00 (KDE 4.5.0)
Qt Version: 4.7.0
Operating System: Linux 2.6.32-24-generic x86_64
Distribution: Ubuntu 10.04.1 LTS

-- Information about the crash:
- What I was doing when the application crashed:
Enabling Kwin causes it to crash, regardless of what one does at the time. However in this case I wasn't doing anything other than enabling it.

-- Backtrace:
Application: KWin (kwin), signal: Aborted
[KCrash Handler]
#6  0x00007f81dcbeca75 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#7  0x00007f81dcbf05c0 in *__GI_abort () at abort.c:92
#8  0x00007f81dcbe5941 in *__GI___assert_fail (assertion=0x7f81daefd3e8 "dpy->xcb->reply_data != ((void *)0)", file=<value optimized out>, line=657, function=0x7f81daefd640 "_XRead") at assert.c:81
#9  0x00007f81dae8701e in _XRead (dpy=0x15cbc90, data=<value optimized out>, size=5180) at ../../src/xcb_io.c:657
#10 0x00007f81da9f8692 in __glXReadReply (dpy=0x15cbc90, size=4, dest=0x1768cb4, reply_is_always_array=1 '\001') at indirect.c:81
#11 0x00007f81da9f933e in __indirect_glGenProgramsNV (n=1, programs=0x1768cb4) at indirect.c:9051
#12 0x00007f81c64ad340 in KWin::ARBBlurShader::init (this=0x1768ca0) at ../../../kwin/effects/blur/blurshader.cpp:468
#13 0x00007f81c64ab1fa in KWin::BlurEffect::reconfigure (this=0x178e3a0, flags=<value optimized out>) at ../../../kwin/effects/blur/blur.cpp:77
#14 0x00007f81c64ab427 in BlurEffect (this=0x178e3a0) at ../../../kwin/effects/blur/blur.cpp:58
#15 0x00007f81c64ab456 in effect_create_kwin4_effect_blur () at ../../../kwin/effects/blur/blur.cpp:34
#16 0x00007f81dd014f75 in KWin::EffectsHandlerImpl::loadEffect (this=0x1720540, name=...) at ../../kwin/effects.cpp:1099
#17 0x00007f81dd015b99 in KWin::EffectsHandlerImpl::reconfigure (this=0x1720540) at ../../kwin/effects.cpp:142
#18 0x00007f81dcff44ac in KWin::Workspace::setupCompositing (this=0x1698010) at ../../kwin/composite.cpp:230
#19 0x00007f81dcf7883d in Workspace (this=0x1698010, restore=<value optimized out>) at ../../kwin/workspace.cpp:217
#20 0x00007f81dcf9032c in Application (this=<value optimized out>) at ../../kwin/main.cpp:326
#21 0x00007f81dcf9134e in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../kwin/main.cpp:510
#22 0x00007f81dcbd7c4d 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=0x7fff9d5a9f58) at libc-start.c:226
#23 0x00000000004006b9 in _start ()

Reported using DrKonqi