vex amd64->IR: unhandled instruction bytes: 0x66 0x66 0x66 0x66
==18028== valgrind: Unrecognised instruction at address 0x451C22.

(gdb) info symbol 0x451c22
strpbrk + 82 in section .text

(gdb) x/2i 0x451c22
0x451c22 <strpbrk+82>:  nopw   %cs:0x0(%rax,%rax,1)
0x451c30 <strpbrk+96>:  add    $0x4,%rax

(gdb) x/14bx strpbrk+82
0x451c22 <strpbrk+82>:  0x66    0x66    0x66    0x66    0x66    0x2e    0x0f    
0x1f
0x451c2a <strpbrk+90>:  0x84    0x00    0x00    0x00    0x00    0x00

The bug is listed at valgrind's bug tracking system as

http://bugs.kde.org/show_bug.cgi?id=148447

"Bug 148447: x86_64 : new NOP codes: 66 66 66 66 2e 0f 1f nopw 
%cs:0x0(%rax,%rax,1) "


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