Update.

	* sysdeps/pthread/createthread.c (do_clone): If __ASSUME_CLONE_STOPPED
	is not defined, do explicit synchronization.
	(create_thread): Do not lock pd->lock here.  If __ASSUME_CLONE_STOPPED
	is not defined also unlock pd->lock for non-debugging case in case
	it is necessary.
	* pthread_create.c (start_thread): Always get and release pd->lock
	if __ASSUME_CLONE_STOPPED is not defined.
	(start_thread_debug): Removed.  Adjust users.
	* allocatestack.c (allocate_stack): Always initialize lock if
	__ASSUME_CLONE_STOPPED is not defined.
	* Makefile (tests): Add tst-sched1.
	* tst-sched1.c: New file.

1 files changed, 10 insertions, 3 deletions

diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
index 729f3b8542..6ada1fe138 100644
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -308,7 +308,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
       /* The first TSD block is included in the TCB.  */
       pd->specific[0] = pd->specific_1stblock;
 
-#if LLL_LOCK_INITIALIZER != 0
+#if defined __ASSUME_CLONE_STOPPED && LLL_LOCK_INITIALIZER != 0
       /* Initialize the lock.  */
       pd->lock = LLL_LOCK_INITIALIZER;
 #endif
@@ -451,7 +451,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
 	     descriptor.  */
 	  pd->specific[0] = pd->specific_1stblock;
 
-#if LLL_LOCK_INITIALIZER != 0
+#if defined __ASSUME_CLONE_STOPPED && LLL_LOCK_INITIALIZER != 0
 	  /* Initialize the lock.  */
 	  pd->lock = LLL_LOCK_INITIALIZER;
 #endif
@@ -564,6 +564,13 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
 	}
     }
 
+#ifndef __ASSUME_CLONE_STOPPED
+  /* Initialize the lock.  We have to do this unconditionally if the
+     CLONE_STOPPED flag is not available since then the stillborn
+     thread could be canceled while the lock is taken.  */
+  pd->lock = LLL_LOCK_INITIALIZER;
+#endif
+
   /* We place the thread descriptor at the end of the stack.  */
   *pdp = pd;
 
@@ -744,7 +751,7 @@ __pthread_init_static_tls (struct link_map *map)
 
   /* Now the list with threads using user-allocated stacks.  */
   list_for_each (runp, &__stack_user)
-    init_one_static_tls (list_entry (runp, struct pthread, list), map);  
+    init_one_static_tls (list_entry (runp, struct pthread, list), map);
 
   lll_unlock (stack_cache_lock);
 }