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From: Richard Li <liptxyz>

sysdeps/x86-64/multiarch/strchr.S (Both glibc-2.12.1 and latest git version):

If %rdi is aligned to a 16-byte boundary, the value of %xmm1 is not properly
set. The following program exposes this problem:


#include <stdio.h>
#include <string.h>
int main ()
{
    char s[] __attribute__((aligned(16))) = "\xff";
    printf ("%p\n", strchr (s, '\xfe'));
    return 0;
}


It is expected to output "(nil)", but it actually prints a valid pointer if run
on an x86-64 system with a multiarch-enabled glibc and a CPU which supports
SSE4.2.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0584.html