--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-not-writable-after-shutdown.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,69 @@
+/* Copyright the libuv project contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "uv.h"
+#include "task.h"
+
+static uv_shutdown_t shutdown_req;
+
+static void close_cb(uv_handle_t* handle) {
+
+}
+
+static void shutdown_cb(uv_shutdown_t* req, int status) {
+  uv_close((uv_handle_t*) req->handle, close_cb);
+}
+
+static void connect_cb(uv_connect_t* req, int status) {
+  int r;
+  ASSERT_OK(status);
+
+  r = uv_shutdown(&shutdown_req, req->handle, shutdown_cb);
+  ASSERT_OK(r);
+
+  ASSERT_OK(uv_is_writable(req->handle));
+}
+
+TEST_IMPL(not_writable_after_shutdown) {
+  int r;
+  struct sockaddr_in addr;
+  uv_loop_t* loop;
+  uv_tcp_t socket;
+  uv_connect_t connect_req;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+  loop = uv_default_loop();
+
+  r = uv_tcp_init(loop, &socket);
+  ASSERT_OK(r);
+
+  r = uv_tcp_connect(&connect_req,
+                     &socket,
+                     (const struct sockaddr*) &addr,
+                     connect_cb);
+  ASSERT_OK(r);
+
+  r = uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}