commit 673659263d956f45f1ce0c66900fa7f1129db74a
Author: Stefan Liebler <stli@linux.vnet.ibm.com>
Date:   Mon May 26 11:14:25 2014 +0200

    Disable lock elision for PTHREAD_MUTEX_NORMAL.
Index: glibc-2.17-c758a686/nptl/pthread_mutexattr_settype.c
===================================================================
--- glibc-2.17-c758a686.orig/nptl/pthread_mutexattr_settype.c
+++ glibc-2.17-c758a686/nptl/pthread_mutexattr_settype.c
@@ -32,7 +32,7 @@ __pthread_mutexattr_settype (attr, kind)
 
   /* Cannot distinguish between DEFAULT and NORMAL. So any settype
      call disables elision for now.  */
-  if (kind == PTHREAD_MUTEX_DEFAULT)
+  if (kind == PTHREAD_MUTEX_NORMAL)
     kind |= PTHREAD_MUTEX_NO_ELISION_NP;
 
   iattr = (struct pthread_mutexattr *) attr;