fix: handle NULL from realloc

runtime/include/priority_queue.h

@@ -292,7 +292,7 @@ priority_queue_initialize(size_t capacity, bool use_lock, priority_queue_get_pri
  * unclear if the fact that the lock is a member in the struct that might be moved by realloc breaks the guarantees of
  * the lock.
  * @param priority_queue to resize
- * @returns pointer to PR. This may have been moved by realloc!
+ * @returns pointer to PR or NULL if realloc fails. This may have been moved by realloc!
  */
 static inline struct priority_queue *
 priority_queue_grow_nolock(struct priority_queue *priority_queue)

runtime/src/local_runqueue_minheap.c

@@ -37,7 +37,9 @@ local_runqueue_minheap_add(struct sandbox *sandbox)
 {
 	int return_code = priority_queue_enqueue_nolock(local_runqueue_minheap, sandbox);
 	if (unlikely(return_code == -ENOSPC)) {
-		local_runqueue_minheap = priority_queue_grow_nolock(local_runqueue_minheap);
+		struct priority_queue *temp = priority_queue_grow_nolock(local_runqueue_minheap);
+		if (unlikely(temp == NULL)) panic("Failed to grow local runqueue\n");
+		local_runqueue_minheap = temp;
 		return_code            = priority_queue_enqueue_nolock(local_runqueue_minheap, sandbox);
 		if (unlikely(return_code == -ENOSPC)) panic("Thread Runqueue is full!\n");
 	}