Application: kwin (4.8.4 (4.8.4))
KDE Platform Version: 4.8.4 (4.8.4) (Compiled from sources)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-25-generic x86_64
Distribution: Ubuntu 12.04 LTS

-- Information about the crash:
After one or two reboots of Kwin , all is ok, but one out of two times the problem goes on...

The crash can be reproduced some of the time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#6  __memcpy_ssse3_back () at ../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:1579
#7  0x00007f7b357fc846 in __indirect_glProgramParameters4fvNV (target=1, index=23560660, num=964810616, params=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:52
#8  0x00007f7b1d50720f in KWin::ARBBlurShader::init (this=0x16781c0) at ../../../kwin/effects/blur/blurshader.cpp:471
#9  0x00007f7b1d502799 in KWin::BlurEffect::reconfigure (this=0x1677390, flags=...) at ../../../kwin/effects/blur/blur.cpp:85
#10 0x00007f7b1d502a77 in KWin::BlurEffect::BlurEffect (this=0x1677390) at ../../../kwin/effects/blur/blur.cpp:53
#11 0x00007f7b1d502b76 in KWin::effect_create_kwin4_effect_blur () at ../../../kwin/effects/blur/blur.cpp:34
#12 0x00007f7b398f85a4 in KWin::EffectsHandlerImpl::loadEffect (this=0x163a4b0, name=..., checkDefault=false) at ../../kwin/effects.cpp:1199
#13 0x00007f7b398f990a in KWin::EffectsHandlerImpl::reconfigure (this=0x163a4b0) at ../../kwin/effects.cpp:196
#14 0x00007f7b398f9e28 in KWin::EffectsHandlerImpl::EffectsHandlerImpl (this=0x163a4b0, type=<optimized out>) at ../../kwin/effects.cpp:128
#15 0x00007f7b398ce14f in KWin::Workspace::setupCompositing (this=0x1555b10) at ../../kwin/composite.cpp:174
#16 0x00007f7b398ceaa5 in KWin::Workspace::setupCompositing (this=<optimized out>) at ../../kwin/composite.cpp:87
#17 0x00007f7b3986a920 in KWin::Workspace::Workspace (this=0x1555b10, restore=false) at ../../kwin/workspace.cpp:227
#18 0x00007f7b39882b8c in KWin::Application::Application (this=<optimized out>) at ../../kwin/main.cpp:322
#19 0x00007f7b3988488c in kdemain (argc=<optimized out>, argv=<optimized out>) at ../../kwin/main.cpp:511
#20 0x00007f7b3948876d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff9e527748, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff9e527738) at libc-start.c:226
#21 0x0000000000400671 in _start ()

Possible duplicates by query: bug 299184, bug 297632, bug 284307.

Reported using DrKonqi