[HiCache] fix: Clone host indices to avoid memory leak

python/sglang/srt/mem_cache/hi_mamba_radix_cache.py

@@ -296,7 +296,7 @@ def write_backup(self, node: TreeNode, write_back=False):
                 extra_pools=extra_pools,
             )
         if host_indices is not None:
-            node.host_value = host_indices
+            node.host_value = host_indices.clone()
             if extra_pools is not None:
                 self.mamba_backup_commit(node, extra_pools)
             assert len(node.host_value) > 0
@@ -2044,7 +2044,7 @@ def mamba_backup_commit(
             return
         host_indices = transfers[0].host_indices
         if node.mamba_host_value is None and host_indices is not None:
-            node.mamba_host_value = host_indices
+            node.mamba_host_value = host_indices.clone()
             self.mamba_host_lru_list.insert_mru(node)
 
     def mamba_archive_transfers(self, node: TreeNode) -> Optional[list[PoolTransfer]]:

python/sglang/srt/mem_cache/hiradix_cache.py

@@ -633,7 +633,7 @@ def write_backup(self, node: TreeNode, write_back=False):
                 node_id=node.id,
             )
         if host_indices is not None:
-            node.host_value = host_indices
+            node.host_value = host_indices.clone()
             assert len(node.host_value) > 0
             self.ongoing_write_through[node.id] = node
             if not write_back: