Application that crashed: systemsettings
Version of the application: 1.0
KDE Version: 4.2.91 (KDE 4.2.91 (KDE 4.3 >= 20090609))
Qt Version: 4.5.1
Operating System: Linux 2.6.29-ARCH i686

What I was doing when the application crashed:
*kde 4.2.90

*steps to reproduce: 
open System Settings (as normal user)> System > Grub editor > try to change menu.lst for sth else (grub.cfg in my case, because I use grub2)

*behaviour: SystemSettings app crashes 

 -- Backtrace:
Application: System Settings (systemsettings), signal: Aborted
[Current thread is 0 (LWP 6208)]

Thread 2 (Thread 0xb1d43b70 (LWP 6562)):
#0  0xb805f424 in __kernel_vsyscall ()
#1  0xb68bbc55 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb691a167 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0xb25aab00 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned () from /usr/lib/libthreadweaver.so.4
#4  0xb25ad17c in ThreadWeaver::WorkingHardState::waitForAvailableJob () from /usr/lib/libthreadweaver.so.4
#5  0xb25a91bb in ThreadWeaver::WeaverImpl::waitForAvailableJob () from /usr/lib/libthreadweaver.so.4
#6  0xb25ad272 in ThreadWeaver::WorkingHardState::applyForWork () from /usr/lib/libthreadweaver.so.4
#7  0xb25aad83 in ThreadWeaver::WeaverImpl::applyForWork () from /usr/lib/libthreadweaver.so.4
#8  0xb25ab38e in ThreadWeaver::ThreadRunHelper::run () from /usr/lib/libthreadweaver.so.4
#9  0xb25ab9ab in ThreadWeaver::Thread::run () from /usr/lib/libthreadweaver.so.4
#10 0xb691914e in ?? () from /usr/lib/libQtCore.so.4
#11 0xb68b76bc in start_thread () from /lib/libpthread.so.0
#12 0xb6702ffe in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5dff710 (LWP 6208)):
[KCrash Handler]
#6  0xb805f424 in __kernel_vsyscall ()
#7  0xb665e7a1 in raise () from /lib/libc.so.6
#8  0xb665ffd4 in abort () from /lib/libc.so.6
#9  0xb6910e44 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb6910f2e in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb6911025 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xa52a3cc8 in QVector<GRUB::ConfigFile::Entry>::last () from /usr/lib/kde4/kgrubeditor.so
#13 0xa529b688 in Core::FileIO::readMenulst () from /usr/lib/kde4/kgrubeditor.so
#14 0xa529da15 in Core::FileIO::readFileInput () from /usr/lib/kde4/kgrubeditor.so
#15 0xa52d3d51 in KGRUBEditor::refresh () from /usr/lib/kde4/kgrubeditor.so
#16 0xa52d9498 in KGRUBEditor::qt_metacall () from /usr/lib/kde4/kgrubeditor.so
#17 0xb6a1d73c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0xb6a1e362 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xb790f293 in KConfigDialog::settingsChanged () from /usr/lib/libkdeui.so.5
#20 0xb79117b7 in KConfigDialog::KConfigDialogPrivate::_k_settingsChangedSlot () from /usr/lib/libkdeui.so.5
#21 0xb7911cf6 in KConfigDialog::qt_metacall () from /usr/lib/libkdeui.so.5
#22 0xb6a1d73c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb6a1e362 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb7911fd7 in KConfigDialogManager::settingsChanged () from /usr/lib/libkdeui.so.5
#25 0xb791359c in KConfigDialogManager::updateSettings () from /usr/lib/libkdeui.so.5
#26 0xb7913eb3 in KConfigDialogManager::qt_metacall () from /usr/lib/libkdeui.so.5
#27 0xb6a1d73c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#28 0xb6a1e362 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#29 0xb7921e07 in KDialog::applyClicked () from /usr/lib/libkdeui.so.5
#30 0xb792456a in KDialog::slotButtonClicked () from /usr/lib/libkdeui.so.5
#31 0xb7926ba9 in KDialog::qt_metacall () from /usr/lib/libkdeui.so.5
#32 0xb79edd7a in KPageDialog::qt_metacall () from /usr/lib/libkdeui.so.5
#33 0xb7911cca in KConfigDialog::qt_metacall () from /usr/lib/libkdeui.so.5
#34 0xb6a1d73c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#35 0xb6a1e362 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#36 0xb6a202f3 in QSignalMapper::mapped () from /usr/lib/libQtCore.so.4
#37 0xb6a20b8d in QSignalMapper::map () from /usr/lib/libQtCore.so.4
#38 0xb6a20d6e in QSignalMapper::map () from /usr/lib/libQtCore.so.4
#39 0xb6a2153b in QSignalMapper::qt_metacall () from /usr/lib/libQtCore.so.4
#40 0xb6a1d73c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#41 0xb6a1db88 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#42 0xb75a9dc1 in QAbstractButton::clicked () from /usr/lib/libQtGui.so.4
#43 0xb72d81c9 in ?? () from /usr/lib/libQtGui.so.4
#44 0xb72d9e24 in ?? () from /usr/lib/libQtGui.so.4
#45 0xb72da0b1 in QAbstractButton::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#46 0xb6f50f52 in QWidget::event () from /usr/lib/libQtGui.so.4
#47 0xb72d806e in QAbstractButton::event () from /usr/lib/libQtGui.so.4
#48 0xb7381abd in QPushButton::event () from /usr/lib/libQtGui.so.4
#49 0xb6efc534 in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#50 0xb6f04570 in QApplication::notify () from /usr/lib/libQtGui.so.4
#51 0xb79bd54a in KApplication::notify () from /usr/lib/libkdeui.so.5
#52 0xb6a07a7b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#53 0xb6f03533 in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#54 0xb6f71024 in ?? () from /usr/lib/libQtGui.so.4
#55 0xb6f70505 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#56 0xb6f9aad2 in ?? () from /usr/lib/libQtGui.so.4
#57 0xb6191e08 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#58 0xb6195370 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#59 0xb61954a3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#60 0xb6a323ac in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#61 0xb6f9a205 in ?? () from /usr/lib/libQtGui.so.4
#62 0xb6a06029 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#63 0xb6a06472 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#64 0xb6a087cf in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#65 0xb6efc3b7 in QApplication::exec () from /usr/lib/libQtGui.so.4
#66 0x08052f0e in _start ()

Reported using DrKonqi