Version:           3.5.0.svn (using KDE 4.2.4)
Compiler:          gcc-4.3.2 
OS:                Linux
Installed from:    Compiled From Sources

Valgrind crashes at the pmovsxdq instruction.

Code is valid and runs without crash if not emulated by valgrind.

==25623== Process terminating with default action of signal 4 (SIGILL)
==25623==  Illegal opcode at address 0x3003AAFDFF
==25623==    at 0x3003AAFDFF: _XkbReadCopyKeySyms (XKBRdBuf.c:88)
==25623==    by 0x3003AAFECB: _XkbReadBufferCopyKeySyms (XKBRdBuf.c:98)
==25623==    by 0x3003AAC03A: _XkbReadGetMapReply (XKBGetMap.c:201)
==25623==    by 0x3003AAD46F: XkbGetUpdatedMap (XKBGetMap.c:526)
==25623==    by 0x3003AAD525: XkbGetMap (XKBGetMap.c:561)
==25623==    by 0x5067142: QKeyMapperPrivate::clearMappings() (qkeymapper_x11.cpp:564)
==25623==    by 0x50305A5: QKeyMapper::changeKeyboard() (qkeymapper.cpp:93)
==25623==    by 0x5043305: qt_init(QApplicationPrivate*, int, _XDisplay*, unsigned long, unsigned long) (qapplication_x11.cpp:2200)
==25623==    by 0x4FD77F2: QApplicationPrivate::construct(_XDisplay*, unsigned long, unsigned long) (qapplication.cpp:749)
==25623==    by 0x4FD83C2: QApplication::QApplication(int&, char**, int) (qapplication.cpp:671)
==25623==    by 0x432500: main (main.cpp:28)