Version: KDE 4.2.1 with Qt 4.5 (using Devel) Compiler: gcc (SUSE Linux) 4.3.2 [gcc-4_3-branch revision 141291] OS: Linux Installed from: Compiled sources I activated the effect by moving the mouse to the top right corner of the screen, here's the backtrace: Application: KWin (kwin), signal SIGSEGV [?1034h[Thread debugging using libthread_db enabled] [Current thread is 1 (Thread 0xb6296700 (LWP 6390))] Thread 1 (Thread 0xb6296700 (LWP 6390)): [KCrash Handler] #6 0x00000030 in ?? () #7 0xb4860b45 in KWin::PresentWindowsEffect::rearrangeWindows (this=0x8270000) at /usr/src/debug/kdebase-workspace-4.2.1/kwin/effects/presentwindows.cpp:484 #8 0xb486122b in KWin::PresentWindowsEffect::setActive (this=0x8270000, active=true, closingTab=false) at /usr/src/debug/kdebase-workspace-4.2.1/kwin/effects/presentwindows.cpp:1153 #9 0xb4861b9a in KWin::PresentWindowsEffect::borderActivated (this=0x8270000, border=KWin::ElectricTopRight) at /usr/src/debug/kdebase-workspace-4.2.1/kwin/effects/presentwindows.h:99 #10 0xb7f510e7 in KWin::EffectsHandlerImpl::borderActivated (this=0x81ee000, border=KWin::ElectricTopRight) at /usr/src/debug/kdebase-workspace-4.2.1/kwin/effects.cpp:321 #11 0xb7edbc25 in KWin::Workspace::checkElectricBorder (this=0x812b270, pos=@0xbf8d1b54, now=21684592) at /usr/src/debug/kdebase-workspace-4.2.1/kwin/workspace.cpp:2260 #12 0xb7edbd32 in KWin::Workspace::electricBorderEvent (this=0x812b270, e=0xbf8d214c) at /usr/src/debug/kdebase-workspace-4.2.1/kwin/workspace.cpp:2324 #13 0xb7f00445 in KWin::Workspace::workspaceEvent (this=0x812b270, e=0xbf8d214c) at /usr/src/debug/kdebase-workspace-4.2.1/kwin/events.cpp:410 #14 0xb7eee032 in KWin::Application::x11EventFilter (this=0xbf8d2464, e=0xbf8d214c) at /usr/src/debug/kdebase-workspace-4.2.1/kwin/main.cpp:359 #15 0xb6fdeebe in qt_x11EventFilter (ev=0xbf8d214c) at kernel/qapplication_x11.cpp:375 #16 0xb6ff1628 in QApplication::x11ProcessEvent (this=0xbf8d2464, event=0xbf8d214c) at kernel/qapplication_x11.cpp:3271 #17 0xb701c3ca in x11EventSourceDispatch (s=0x80575a8, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146 #18 0xb63a89a8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #19 0xb63ac063 in ?? () from /usr/lib/libglib-2.0.so.0 #20 0xb63ac221 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0 #21 0xb6d1f428 in QEventDispatcherGlib::processEvents (this=0x80545c8, flags={i = -1081269496}) at kernel/qeventdispatcher_glib.cpp:323 #22 0xb701bac5 in QGuiEventDispatcherGlib::processEvents (this=0x80545c8, flags={i = -1081269448}) at kernel/qguieventdispatcher_glib.cpp:202 #23 0xb6cf1ffa in QEventLoop::processEvents (this=0xbf8d23b0, flags={i = -1081269384}) at kernel/qeventloop.cpp:149 #24 0xb6cf243a in QEventLoop::exec (this=0xbf8d23b0, flags={i = -1081269320}) at kernel/qeventloop.cpp:200 #25 0xb6cf48e9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880 #26 0xb6f7bd67 in QApplication::exec () at kernel/qapplication.cpp:3553 #27 0xb7ef0eba in kdemain (argc=3, argv=0xbf8d2634) at /usr/src/debug/kdebase-workspace-4.2.1/kwin/main.cpp:519 #28 0x080487b2 in main (argc=0, argv=0x8284a88) at /usr/src/debug/kdebase-workspace-4.2.1/build/kwin/kwin_dummy.cpp:3
It seems that this was fixed on 4.3trunk but not backported (or missed 4.2.1) *** This bug has been marked as a duplicate of bug 179537 ***
It was backported, distributions decided to release 4.2.1 before KDE did though so most of them have incomplete packages. Go yell at your distribution please.