commit 05598a0907cad1350962e89b781215209a785d92
Author: Patsy Franklin <pfrankli@redhat.com>
Date:   Tue Jun 26 10:35:03 2018 -0400

    In sem_open.c,  pad was not initialized when __HAVE_64B_ATOMICS was
    true.  On some arches this caused valgrind to warn about uninitialized
    bytes when the struct was written to the file system.
    
    This patch moves the initialization of pad outside of the
    conditional.

    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

diff -Nrup a/nptl/sem_open.c b/nptl/sem_open.c
--- a/nptl/sem_open.c	2018-06-20 10:27:01.110844222 -0400
+++ b/nptl/sem_open.c	2018-06-27 11:15:33.677892273 -0400
@@ -313,6 +313,9 @@ sem_open (const char *name, int oflag, .
       sem.newsem.value = value << SEM_VALUE_SHIFT;
       sem.newsem.nwaiters = 0;
 #endif
+      /* pad is used as a mutex on pre-v9 sparc and ignored otherwise.  */
+      sem.newsem.pad = 0;
+
       /* This always is a shared semaphore.  */
       sem.newsem.private = LLL_SHARED;