diff --git a/chapter06/glibc.xml b/chapter06/glibc.xml
index 95608d25b..c83b80a67 100644
--- a/chapter06/glibc.xml
+++ b/chapter06/glibc.xml
@@ -176,13 +176,13 @@ unset GCC_INCDIR</userinput></screen>
         fail.  The reason is not completely understood, but indications are
         that minor timing issues can trigger these failures.</para>
       </listitem>
-
+-->
       <listitem>
         <para>The math tests sometimes fail when running on
         systems where the CPU is not a relatively new Intel or
         AMD processor.</para>
       </listitem>
-
+<!--
       <listitem>
         <para>The
         <emphasis>nptl/tst-thread-affinity-{pthread,pthread2,sched}</emphasis>