Valgrind (version in Ubuntu, and also the latest SVN version (3.8.0.SVN)) crashes with message: vex amd64->IR: unhandled instruction bytes: 0xC5 0xF8 0x57 0xC0 0xC5 0xFA 0x11 When stepping with gdb to the problem address the instruction is: c5 f8 57 c0 vxorps %xmm0,%xmm0,%xmm0 The program runs OK without valgrind. Eero
*** This bug has been marked as a duplicate of bug 273475 ***