diff --git a/shadowsocks/crypto/util.py b/shadowsocks/crypto/util.py
index 4deb637..212df86 100644
--- a/shadowsocks/crypto/util.py
+++ b/shadowsocks/crypto/util.py
@@ -87,8 +87,9 @@ def find_library(possible_lib_names, search_symbol, library_name):
             else:
                 logging.warn('can\'t find symbol %s in %s', search_symbol,
                              path)
-        except ValueError as e:
-            logging.error(e)
+        except Exception:
+            if path == paths[-1]:
+                raise
     return None