Index: glibc-2.13/sysdeps/x86_64/multiarch/Makefile
===================================================================
--- glibc-2.13.orig/sysdeps/x86_64/multiarch/Makefile
+++ glibc-2.13/sysdeps/x86_64/multiarch/Makefile
@@ -6,7 +6,7 @@ endif
 ifeq ($(subdir),string)
 sysdep_routines += stpncpy-c strncpy-c strcmp-ssse3 strncmp-ssse3 \
 		   strend-sse4 memcmp-sse4 memcpy-ssse3 mempcpy-ssse3 \
-		   memmove-ssse3 memcpy-ssse3-back mempcpy-ssse3-back \
+		   memmove-ssse3 mempcpy-ssse3-back \
 		   memmove-ssse3-back strcasestr-nonascii strcasecmp_l-ssse3 \
 		   strncase_l-ssse3 strlen-sse4 strlen-no-bsf \
 		   memset-x86-64
Index: glibc-2.13/sysdeps/x86_64/multiarch/memcpy.S
===================================================================
--- glibc-2.13.orig/sysdeps/x86_64/multiarch/memcpy.S
+++ glibc-2.13/sysdeps/x86_64/multiarch/memcpy.S
@@ -35,9 +35,11 @@ ENTRY(memcpy)
 	testl	$bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
 	jz	2f
 	leaq	__memcpy_ssse3(%rip), %rax
+	/* disable backward memcpy for glibc 2.13 
 	testl	$bit_Fast_Copy_Backward, __cpu_features+FEATURE_OFFSET+index_Fast_Copy_Backward(%rip)
 	jz	2f
 	leaq	__memcpy_ssse3_back(%rip), %rax
+	*/
 2:	ret
 END(memcpy)
 
Index: glibc-2.13/sysdeps/x86_64/multiarch/memcpy_chk.S
===================================================================
--- glibc-2.13.orig/sysdeps/x86_64/multiarch/memcpy_chk.S
+++ glibc-2.13/sysdeps/x86_64/multiarch/memcpy_chk.S
@@ -36,9 +36,11 @@ ENTRY(__memcpy_chk)
 	testl	$bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
 	jz	2f
 	leaq	__memcpy_chk_ssse3(%rip), %rax
+	/* disable backwards memcpy until glibc 2.14
 	testl	$bit_Fast_Copy_Backward, __cpu_features+FEATURE_OFFSET+index_Fast_Copy_Backward(%rip)
 	jz	2f
 	leaq	__memcpy_chk_ssse3_back(%rip), %rax
+	*/
 2:	ret
 END(__memcpy_chk)
 # else