diff -pruN glibc-2.17-c758a686/include/libc-internal.h glibc-2.17-c758a686/include/libc-internal.h
--- glibc-2.17-c758a686/include/libc-internal.h	2012-12-25 08:32:13.000000000 +0530
+++ glibc-2.17-c758a686/include/libc-internal.h	2013-07-30 11:26:37.947943710 +0530
@@ -50,4 +50,24 @@ extern void __init_misc (int, char **, c
 /* Cast an integer or a pointer VAL to integer with proper type.  */
 # define cast_to_integer(val) ((__integer_if_pointer_type (val)) (val))
 
+/* Align a value by rounding down to closest size.
+   e.g. Using size of 4096, we get this behavior:
+	{4095, 4096, 4097} = {0, 4096, 4096}.  */
+#define ALIGN_DOWN(base, size)	((base) & -((__typeof__ (base)) (size)))
+
+/* Align a value by rounding up to closest size.
+   e.g. Using size of 4096, we get this behavior:
+	{4095, 4096, 4097} = {4096, 4096, 8192}.
+
+  Note: The size argument has side effects (expanded multiple times).  */
+#define ALIGN_UP(base, size)	ALIGN_DOWN ((base) + (size) - 1, (size))
+
+/* Same as ALIGN_DOWN(), but automatically casts when base is a pointer.  */
+#define PTR_ALIGN_DOWN(base, size) \
+  ((__typeof__ (base)) ALIGN_DOWN ((uintptr_t) (base), (size)))
+
+/* Same as ALIGN_UP(), but automatically casts when base is a pointer.  */
+#define PTR_ALIGN_UP(base, size) \
+  ((__typeof__ (base)) ALIGN_UP ((uintptr_t) (base), (size)))
+
 #endif /* _LIBC_INTERNAL  */
diff -pruN glibc-2.17-c758a686/nptl/allocatestack.c glibc-2.17-c758a686/nptl/allocatestack.c
--- glibc-2.17-c758a686/nptl/allocatestack.c	2012-12-25 08:32:13.000000000 +0530
+++ glibc-2.17-c758a686/nptl/allocatestack.c	2013-07-30 11:26:38.012943707 +0530
@@ -355,7 +355,7 @@ allocate_stack (const struct pthread_att
 
   /* Get the stack size from the attribute if it is set.  Otherwise we
      use the default we determined at start time.  */
-  size = attr->stacksize ?: __default_stacksize;
+  size = attr->stacksize ?: __default_pthread_attr.stacksize;
 
   /* Get memory for the stack.  */
   if (__builtin_expect (attr->flags & ATTR_FLAG_STACKADDR, 0))
diff -pruN glibc-2.17-c758a686/nptl/nptl-init.c glibc-2.17-c758a686/nptl/nptl-init.c
--- glibc-2.17-c758a686/nptl/nptl-init.c	2013-07-30 11:45:16.902904743 +0530
+++ glibc-2.17-c758a686/nptl/nptl-init.c	2013-07-30 11:44:59.538905347 +0530
@@ -423,7 +423,8 @@ __pthread_initialize_minimal_internal (v
 
   /* Round the resource limit up to page size.  */
   limit.rlim_cur = (limit.rlim_cur + pagesz - 1) & -pagesz;
-  __default_stacksize = limit.rlim_cur;
+  __default_pthread_attr.stacksize = limit.rlim_cur;
+  __default_pthread_attr.guardsize = GLRO (dl_pagesize);
 
 #ifdef SHARED
   /* Transfer the old value from the dynamic linker's internal location.  */
diff -pruN glibc-2.17-c758a686/nptl/pthread_attr_getstacksize.c glibc-2.17-c758a686/nptl/pthread_attr_getstacksize.c
--- glibc-2.17-c758a686/nptl/pthread_attr_getstacksize.c	2012-12-25 08:32:13.000000000 +0530
+++ glibc-2.17-c758a686/nptl/pthread_attr_getstacksize.c	2013-07-30 11:26:39.650943650 +0530
@@ -32,7 +32,7 @@ __pthread_attr_getstacksize (attr, stack
 
   /* If the user has not set a stack size we return what the system
      will use as the default.  */
-  *stacksize = iattr->stacksize ?: __default_stacksize;
+  *stacksize = iattr->stacksize ?: __default_pthread_attr.stacksize;
 
   return 0;
 }
diff -pruN glibc-2.17-c758a686/nptl/pthread_barrier_init.c glibc-2.17-c758a686/nptl/pthread_barrier_init.c
--- glibc-2.17-c758a686/nptl/pthread_barrier_init.c	2012-12-25 08:32:13.000000000 +0530
+++ glibc-2.17-c758a686/nptl/pthread_barrier_init.c	2013-07-30 11:26:40.206943631 +0530
@@ -22,7 +22,7 @@
 #include <kernel-features.h>
 
 
-static const struct pthread_barrierattr default_attr =
+static const struct pthread_barrierattr default_barrierattr =
   {
     .pshared = PTHREAD_PROCESS_PRIVATE
   };
@@ -42,7 +42,7 @@ pthread_barrier_init (barrier, attr, cou
   const struct pthread_barrierattr *iattr
     = (attr != NULL
        ? iattr = (struct pthread_barrierattr *) attr
-       : &default_attr);
+       : &default_barrierattr);
 
   if (iattr->pshared != PTHREAD_PROCESS_PRIVATE
       && __builtin_expect (iattr->pshared != PTHREAD_PROCESS_SHARED, 0))
diff -pruN glibc-2.17-c758a686/nptl/pthread_create.c glibc-2.17-c758a686/nptl/pthread_create.c
--- glibc-2.17-c758a686/nptl/pthread_create.c	2012-12-25 08:32:13.000000000 +0530
+++ glibc-2.17-c758a686/nptl/pthread_create.c	2013-07-30 11:26:40.774943611 +0530
@@ -432,15 +432,6 @@ start_thread (void *arg)
 }
 
 
-/* Default thread attributes for the case when the user does not
-   provide any.  */
-static const struct pthread_attr default_attr =
-  {
-    /* Just some value > 0 which gets rounded to the nearest page size.  */
-    .guardsize = 1,
-  };
-
-
 int
 __pthread_create_2_1 (newthread, attr, start_routine, arg)
      pthread_t *newthread;
@@ -454,7 +445,7 @@ __pthread_create_2_1 (newthread, attr, s
   if (iattr == NULL)
     /* Is this the best idea?  On NUMA machines this could mean
        accessing far-away memory.  */
-    iattr = &default_attr;
+    iattr = &__default_pthread_attr;
 
   struct pthread *pd = NULL;
   int err = ALLOCATE_STACK (iattr, &pd);
diff -pruN glibc-2.17-c758a686/nptl/pthread_mutex_init.c glibc-2.17-c758a686/nptl/pthread_mutex_init.c
--- glibc-2.17-c758a686/nptl/pthread_mutex_init.c	2012-12-25 08:32:13.000000000 +0530
+++ glibc-2.17-c758a686/nptl/pthread_mutex_init.c	2013-07-30 11:26:42.079943566 +0530
@@ -24,7 +24,7 @@
 
 #include <stap-probe.h>
 
-static const struct pthread_mutexattr default_attr =
+static const struct pthread_mutexattr default_mutexattr =
   {
     /* Default is a normal mutex, not shared between processes.  */
     .mutexkind = PTHREAD_MUTEX_NORMAL
@@ -45,7 +45,8 @@ __pthread_mutex_init (mutex, mutexattr)
 
   assert (sizeof (pthread_mutex_t) <= __SIZEOF_PTHREAD_MUTEX_T);
 
-  imutexattr = (const struct pthread_mutexattr *) mutexattr ?: &default_attr;
+  imutexattr = ((const struct pthread_mutexattr *) mutexattr
+		?: &default_mutexattr);
 
   /* Sanity checks.  */
   switch (__builtin_expect (imutexattr->mutexkind
diff -pruN glibc-2.17-c758a686/nptl/pthreadP.h glibc-2.17-c758a686/nptl/pthreadP.h
--- glibc-2.17-c758a686/nptl/pthreadP.h	2012-12-25 08:32:13.000000000 +0530
+++ glibc-2.17-c758a686/nptl/pthreadP.h	2013-07-30 11:26:43.095943530 +0530
@@ -147,8 +147,8 @@ enum
 /* Internal variables.  */
 
 
-/* Default stack size.  */
-extern size_t __default_stacksize attribute_hidden;
+/* Default pthread attributes.  */
+extern struct pthread_attr __default_pthread_attr attribute_hidden;
 
 /* Size and alignment of static TLS block.  */
 extern size_t __static_tls_size attribute_hidden;
diff -pruN glibc-2.17-c758a686/nptl/pthread_rwlock_init.c glibc-2.17-c758a686/nptl/pthread_rwlock_init.c
--- glibc-2.17-c758a686/nptl/pthread_rwlock_init.c	2012-12-25 08:32:13.000000000 +0530
+++ glibc-2.17-c758a686/nptl/pthread_rwlock_init.c	2013-07-30 11:26:43.745943508 +0530
@@ -21,7 +21,7 @@
 #include <kernel-features.h>
 
 
-static const struct pthread_rwlockattr default_attr =
+static const struct pthread_rwlockattr default_rwlockattr =
   {
     .lockkind = PTHREAD_RWLOCK_DEFAULT_NP,
     .pshared = PTHREAD_PROCESS_PRIVATE
@@ -35,7 +35,7 @@ __pthread_rwlock_init (rwlock, attr)
 {
   const struct pthread_rwlockattr *iattr;
 
-  iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_attr;
+  iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_rwlockattr;
 
   memset (rwlock, '\0', sizeof (*rwlock));
 
diff -pruN glibc-2.17-c758a686/nptl/vars.c glibc-2.17-c758a686/nptl/vars.c
--- glibc-2.17-c758a686/nptl/vars.c	2012-12-25 08:32:13.000000000 +0530
+++ glibc-2.17-c758a686/nptl/vars.c	2013-07-30 11:26:43.763943507 +0530
@@ -20,13 +20,9 @@
 #include <tls.h>
 #include <unistd.h>
 
-/* Default stack size.  */
-size_t __default_stacksize attribute_hidden
-#ifdef SHARED
-;
-#else
-  = PTHREAD_STACK_MIN;
-#endif
+/* Default thread attributes for the case when the user does not
+   provide any.  */
+struct pthread_attr __default_pthread_attr attribute_hidden;
 
 /* Flag whether the machine is SMP or not.  */
 int __is_smp attribute_hidden;