From a2d0e9a29b81ad63b508dd8b8cf2f11a9b60990f Mon Sep 17 00:00:00 2001
From: Eryx-Z <eryx-z@users.noreply.github.com>
Date: Sat, 17 Oct 2026 06:52:22 +0800
Subject: [PATCH] Guard Server.close/_unref when constructed with loop=None

Server(None) is constructible from Python; close() then segfaulted in
_unref via self._loop._servers. Return early when _loop is missing so
invalid construction raises a clean error path instead of crashing.

Fixes #760
---
 uvloop/server.pyx | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/uvloop/server.pyx b/uvloop/server.pyx
index 845bcfda..2dedbcc8 100644
--- a/uvloop/server.pyx
+++ b/uvloop/server.pyx
@@ -44,6 +44,9 @@ cdef class Server:
         self._loop._servers.add(self)
 
     cdef _unref(self):
+        # Server(None) is constructible from Python; guard before touching _loop.
+        if self._loop is None:
+            return
         self._loop._servers.discard(self)
 
     # Public API
@@ -77,6 +80,9 @@ cdef class Server:
     def close(self):
         cdef list servers
 
+        if self._loop is None:
+            return
+
         if self._servers is None:
             return