diff --git a/lldb/test/Shell/Register/x86-64-write.test b/lldb/test/Shell/Register/x86-64-write.test
--- a/lldb/test/Shell/Register/x86-64-write.test
+++ b/lldb/test/Shell/Register/x86-64-write.test
@@ -1,5 +1,9 @@
 # XFAIL: system-darwin
 # XFAIL: system-windows
+
+# Bug on GDB https://sourceware.org/bugzilla/show_bug.cgi?id=28803
+# XFAIL: !native-cpu-avx
+
 # REQUIRES: native && target-x86_64
 # RUN: %clangxx_host %p/Inputs/x86-64-write.cpp -o %t
 # RUN: %lldb -b -s %s %t | FileCheck %s
diff --git a/lldb/test/Shell/Register/x86-mm-xmm-write.test b/lldb/test/Shell/Register/x86-mm-xmm-write.test
--- a/lldb/test/Shell/Register/x86-mm-xmm-write.test
+++ b/lldb/test/Shell/Register/x86-mm-xmm-write.test
@@ -1,5 +1,9 @@
 # XFAIL: system-darwin
 # XFAIL: system-windows
+
+# Bug on GDB https://sourceware.org/bugzilla/show_bug.cgi?id=28803
+# XFAIL: !native-cpu-avx
+
 # REQUIRES: native && (target-x86 || target-x86_64) && native-cpu-sse
 # RUN: %clangxx_host %p/Inputs/x86-mm-xmm-write.cpp -o %t
 # RUN: %lldb -b -s %s %t | FileCheck %s