Add some sanity checking and extra locking to guard against concurrent access patterns in core.

src/input/input.c

@@ -406,6 +406,8 @@ void input_StopThread( input_thread_t *p_input )
  */
 void input_DestroyThread( input_thread_t *p_input )
 {
+    if( p_input )
+    {
         /* Join the thread */
         vlc_thread_join( p_input );
 
@@ -414,6 +416,7 @@ void input_DestroyThread( input_thread_t *p_input )
 
         /* TODO: maybe input_DestroyThread should also delete p_input instead
          * of the playlist but I'm not sure if it's possible */
+    }
 }
 
 /*****************************************************************************
@@ -423,13 +426,13 @@ void input_DestroyThread( input_thread_t *p_input )
  *****************************************************************************/
 static int Run( input_thread_t *p_input )
 {
-    /* Signal that the thread is launched */
     vlc_thread_ready( p_input );
 
     if( Init( p_input, VLC_FALSE ) )
     {
         /* If we failed, wait before we are killed, and exit */
         p_input->b_error = VLC_TRUE;
+    /* Signal that the thread is launched */
 
         Error( p_input );
 

src/playlist/item-ext.c

@@ -734,7 +734,7 @@ int playlist_Clear( playlist_t * p_playlist )
     int i;
     for( i = p_playlist->i_size; i > 0 ; i-- )
     {
-        playlist_Delete( p_playlist, p_playlist->pp_items[0]->input.i_id );
+        playlist_LockDelete( p_playlist, p_playlist->pp_items[0]->input.i_id );
     }
     for( i = 0 ; i< p_playlist->i_views; i++ )
     {

src/playlist/playlist.c

@@ -657,6 +657,8 @@ static void RunThread ( playlist_t *p_playlist )
                 /* Destroy input */
                 input_DestroyThread( p_input );
 
+                vlc_mutex_lock( &p_playlist->object_lock );
+
                 /* Unlink current input
                  * (_after_ input_DestroyThread for vout garbage collector) */
                 vlc_object_detach( p_input );
@@ -796,6 +798,9 @@ static void RunThread ( playlist_t *p_playlist )
 
             /* Destroy input */
             input_DestroyThread( p_input );
+
+            vlc_mutex_lock( &p_playlist->object_lock );
+
             /* Unlink current input (_after_ input_DestroyThread for vout
              * garbage collector)*/
             vlc_object_detach( p_input );