diff --git a/modules/file_manager.py b/modules/file_manager.py
index 3ee1f2b..ae8bfd8 100644
--- a/modules/file_manager.py
+++ b/modules/file_manager.py
@@ -29,12 +29,15 @@ except ImportError:  # 兼容全局环境中存在同名包的情况
         PROJECT_MAX_STORAGE_BYTES,
     )
 from modules.container_file_proxy import ContainerFileProxy
+from utils.logger import setup_logger
 
 if TYPE_CHECKING:
     from modules.user_container_manager import ContainerHandle
 
 # 临时禁用长度检查
 DISABLE_LENGTH_CHECK = True
+
+logger = setup_logger(__name__)
 class FileManager:
     def __init__(self, project_path: str, container_session: Optional["ContainerHandle"] = None):
         self.project_path = Path(project_path).resolve()
@@ -68,16 +71,24 @@ class FileManager:
         return self._container_proxy.run(action, payload)
     
     def _get_project_size(self) -> int:
-        """计算项目目录的总大小（字节）"""
+        """计算项目目录的总大小（字节），遇到异常时记录并抛出。"""
         total = 0
         if not self.project_path.exists():
             return 0
+
         for path in self.project_path.rglob('*'):
-            try:
-                if path.is_file():
-                    total += path.stat().st_size
-            except PermissionError:
+            if not path.is_file():
                 continue
+            try:
+                total += path.stat().st_size
+            except Exception as exc:
+                logger.error(
+                    "Failed to stat %s while calculating project size: %s",
+                    path,
+                    exc,
+                    exc_info=True,
+                )
+                raise
         return total
         
     def _validate_path(self, path: str) -> Tuple[bool, str, Path]: