test/ring-leak.c: kick UNIX garbage collection

Provide a more deterministic runtime by avoiding waiting for a random
GC run. This can take a long time depending on what is going on in
the host, it's been observed to even timeout the test.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

test/ring-leak.c

@@ -135,6 +135,17 @@ static int test_iowq_request_cancel(void)
 	return 0;
 }
 
+static void trigger_unix_gc(void)
+{
+	int fd;
+
+	fd = socket(AF_UNIX, SOCK_DGRAM, 0);
+	if (fd < 0)
+		perror("socket dgram");
+	else
+		close(fd);
+}
+
 static int test_scm_cycles(bool update)
 {
 	char buffer[128];
@@ -193,6 +204,8 @@ static int test_scm_cycles(bool update)
 	/* should unregister files and close the write fd */
 	io_uring_queue_exit(&ring);
 
+	trigger_unix_gc();
+
 	/*
 	 * We're trying to wait for the ring to "really" exit, that will be
 	 * done async. For that rely on the registered write end to be closed