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-rw-r--r--nptl/allocatestack.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
index 7f6094ebb2..2a5ac22117 100644
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -1173,13 +1173,18 @@ init_one_static_tls (struct pthread *curp, struct link_map *map)
 #  error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
 # endif
 
-  /* Fill in the DTV slot so that a later LD/GD access will find it.  */
-  dtv[map->l_tls_modid].pointer.val = dest;
-  dtv[map->l_tls_modid].pointer.is_static = true;
-
   /* Initialize the memory.  */
   memset (__mempcpy (dest, map->l_tls_initimage, map->l_tls_initimage_size),
 	  '\0', map->l_tls_blocksize - map->l_tls_initimage_size);
+
+  /* Fill in the DTV slot so that a later LD/GD access will find it.  */
+  dtv[map->l_tls_modid].pointer.is_static = true;
+  /* Pairs against the read barrier in tls_get_attr_tail, guaranteeing
+     any thread waiting for an update to pointer.val sees the
+     initimage write.  */
+  atomic_write_barrier ();
+  dtv[map->l_tls_modid].pointer.val = dest;
+
 }
 
 void