Application: kwin (4.7.41 (4.7.41 (KDE 4.8 >= 20110807))
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.1.0-2-generic x86_64
Distribution: Ubuntu precise (development branch)

-- Information about the crash:
- What I was doing when the application crashed:
On every login kwin crashes. I'm using master kde-workspace (project Neon packages).

kwin --replace
Application::crashHandler() called with signal 11; recent crashes: 1
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kwin path = /opt/project-neon/bin pid = 9994
KCrash: Arguments: /opt/project-neon/bin/kwin --nocrashhandler --replace 
KCrash: Attempting to start /opt/project-neon/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/home/sumski/.project-neon-kde/socket-shumarija/kdeinit4__0
Application::crashHandler() called with signal 11; recent crashes: 2
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kwin path = /opt/project-neon/bin pid = 9998
KCrash: Arguments: /opt/project-neon/bin/kwin --nocrashhandler --crashes 1 
KCrash: Attempting to start /opt/project-neon/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/home/sumski/.project-neon-kde/socket-shumarija/kdeinit4__0
Application::crashHandler() called with signal 11; recent crashes: 3

[1]+  Stopped

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#6  0x00007fdec9782598 in Oxygen::Helper::invalidateCaches() () from /usr/lib/liboxygenstyle.so.4
#7  0x00007fdec4fc58e0 in Oxygen::DecoHelper::invalidateCaches (this=0x1d0e200) at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/kwin/clients/oxygen/oxygendecohelper.cpp:43
#8  0x00007fdec4fcc657 in Oxygen::Factory::readConfig (this=0x1d0e1d0) at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/kwin/clients/oxygen/oxygenfactory.cpp:105
#9  0x00007fdec4fcc423 in Oxygen::Factory::Factory (this=0x1d0e1d0) at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/kwin/clients/oxygen/oxygenfactory.cpp:53
#10 0x00007fdec4fcc333 in create_factory () at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/kwin/clients/oxygen/oxygenfactory.cpp:41
#11 0x00007fdedb5bdb63 in KDecorationPlugins::loadPlugin (this=0x1cfeef0, nameStr=...) at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/kwin/libkdecorations/kdecoration_plugins_p.cpp:175
#12 0x00007fdedcd7a960 in KWin::PluginMgr::PluginMgr (this=0x1cfeef0) at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/kwin/plugins.cpp:40
#13 0x00007fdedcd42081 in KWin::Workspace::Workspace (this=0x1c77950, restore=false) at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/kwin/workspace.cpp:178
#14 0x00007fdedcd74140 in KWin::Application::Application (this=0x7fffadc8aa50) at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/kwin/main.cpp:322
#15 0x00007fdedcd751ed in kdemain (argc=3, argv=0x7fffadc8b048) at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/kwin/main.cpp:495
#16 0x0000000000400796 in main (argc=3, argv=0x7fffadc8b048) at /build/buildd/project-neon-kde-workspace-2+git20111107+r46187/obj-x86_64-linux-gnu/kwin/kwin_dummy.cpp:3

Reported using DrKonqi