1 files changed, 3 insertions, 0 deletions
diff --git a/src/threads/thread.c b/src/threads/thread.c
index 43dd8e3..3112a71 100644
--- a/src/threads/thread.c
+++ b/src/threads/thread.c
@@ -436,6 +436,9 @@ init_thread (struct thread *t, const char *name, int priority)
   strlcpy (t->name, name, sizeof t->name);
   t->stack = (uint8_t *) t + PGSIZE;
   t->priority = priority;
+#ifdef USERPROG
+  list_init (&t->children);
+#endif
   t->magic = THREAD_MAGIC;
 }