Application: kwin (4.4.1 (KDE 4.4.1))
KDE Platform Version: 4.4.1 (KDE 4.4.1)
Qt Version: 4.6.2
Operating System: Linux 2.6.32-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
This seems to happen very randomly, but anytime i change color scheme or plasma theme, there's probably a 1 in 4 chance plasma and kwin will crash. Sometimes they restart, other times i can't access krunner to restart plasma. I also lose my window borders sometimes. This was happening in 4.3 also. I have a fresh install of Archlinux 64 with 4.4. 

 -- Backtrace:
Application: KWin (kwin), signal: Bus error
[KCrash Handler]
#5  0x00007f40da4126c0 in KPixmapCache::Private::mmapFile(QString const&, KPixmapCache::Private::MmapInfo*, int) () from /usr/lib/libkdeui.so.5
#6  0x00007f40da413f64 in KPixmapCache::Private::mmapFiles() () from /usr/lib/libkdeui.so.5
#7  0x00007f40da413d83 in KPixmapCache::Private::init() () from /usr/lib/libkdeui.so.5
#8  0x00007f40da4157ed in KPixmapCache::discard() () from /usr/lib/libkdeui.so.5
#9  0x00007f40da415ed8 in KPixmapCache::deleteCache(QString const&) () from /usr/lib/libkdeui.so.5
#10 0x00007f40d9e42fad in Plasma::ThemePrivate::discardCache() () from /usr/lib/libplasma.so.3
#11 0x00007f40d9e4326e in Plasma::ThemePrivate::colorsChanged() () from /usr/lib/libplasma.so.3
#12 0x00007f40d9e48f72 in Plasma::Theme::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libplasma.so.3
#13 0x00007f40d67c54df in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x00007f40da3ba504 in KGlobalSettings::Private::kdisplaySetPalette() () from /usr/lib/libkdeui.so.5
#15 0x00007f40da3be4df in KGlobalSettings::Private::_k_slotNotifyChange(int, int) () from /usr/lib/libkdeui.so.5
#16 0x00007f40da3be573 in KGlobalSettings::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdeui.so.5
#17 0x00007f40d6ae8791 in ?? () from /usr/lib/libQtDBus.so.4
#18 0x00007f40d6af31af in ?? () from /usr/lib/libQtDBus.so.4
#19 0x00007f40d67c2419 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#20 0x00007f40d6ee75ec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#21 0x00007f40d6eedbdb in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x00007f40da393d36 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#23 0x00007f40d67b279c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#24 0x00007f40d67b4f17 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#25 0x00007f40d67dc0d3 in ?? () from /usr/lib/libQtCore.so.4
#26 0x00007f40cfbe126e in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#27 0x00007f40cfbe4c28 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#28 0x00007f40cfbe4d50 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#29 0x00007f40d67dbc13 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0x00007f40d6f95d6e in ?? () from /usr/lib/libQtGui.so.4
#31 0x00007f40d67b10c2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#32 0x00007f40d67b149c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#33 0x00007f40d67b51db in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#34 0x00007f40dab4ceae in kdemain () from /usr/lib/libkdeinit4_kwin.so
#35 0x00007f40da7c7b6d in __libc_start_main () from /lib/libc.so.6
#36 0x00000000004005c9 in _start ()

This bug may be a duplicate of or related to bug 182026.

Possible duplicates by query: bug 218560.

Reported using DrKonqi