--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-loop-close.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,77 @@
+/* Copyright Joyent, Inc. and other Node 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_timer_t timer_handle;
+
+static void timer_cb(uv_timer_t* handle) {
+  ASSERT(handle);
+  uv_stop(handle->loop);
+}
+
+
+TEST_IMPL(loop_close) {
+  int r;
+  uv_loop_t loop;
+
+  loop.data = &loop;
+  ASSERT_OK(uv_loop_init(&loop));
+  ASSERT_PTR_EQ(loop.data, (void*) &loop);
+
+  uv_timer_init(&loop, &timer_handle);
+  uv_timer_start(&timer_handle, timer_cb, 100, 100);
+
+  ASSERT_EQ(UV_EBUSY, uv_loop_close(&loop));
+
+  uv_run(&loop, UV_RUN_DEFAULT);
+
+  uv_close((uv_handle_t*) &timer_handle, NULL);
+  r = uv_run(&loop, UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  ASSERT_PTR_EQ(loop.data, (void*) &loop);
+  ASSERT_OK(uv_loop_close(&loop));
+  ASSERT_PTR_EQ(loop.data, (void*) &loop);
+
+  return 0;
+}
+
+static void loop_instant_close_work_cb(uv_work_t* req) {
+}
+
+static void loop_instant_close_after_work_cb(uv_work_t* req, int status) {
+}
+
+/* It's impossible to properly cleanup after this test because loop can't be
+ * closed while work has been queued. */
+TEST_IMPL(loop_instant_close) {
+  static uv_loop_t loop;
+  static uv_work_t req;
+  ASSERT_OK(uv_loop_init(&loop));
+  ASSERT_OK(uv_queue_work(&loop,
+                          &req,
+                          loop_instant_close_work_cb,
+                          loop_instant_close_after_work_cb));
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}