check for a document being "fully-active" before reflows

components/script/dom/document.rs

@@ -1741,7 +1741,11 @@ impl Document {
                 self.process_deferred_scripts();
             },
             LoadType::PageSource(_) => {
-                if self.has_browsing_context {
+                if self.has_browsing_context && self.is_fully_active() {
+                    // Note: if the document is not fully active, the layout thread will have exited already.
+                    // The underlying problem might actually be that layout exits while it should be kept alive.
+                    // See https://github.com/servo/servo/issues/22507
+
                     // Disarm the reflow timer and trigger the initial reflow.
                     self.reflow_timeout.set(None);
                     self.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);

components/script/script_thread.rs

@@ -1314,6 +1314,10 @@ impl ScriptThread {
         // into this loop too, but for now it's only images.
         debug!("Issuing batched reflows.");
         for (_, document) in self.documents.borrow().iter() {
+            // Step 13
+            if !document.is_fully_active() {
+                continue;
+            }
             let window = document.window();
             let pending_reflows = window.get_pending_reflow_count();
             if pending_reflows > 0 {

tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/active.window.js.ini

@@ -1,5 +1,4 @@
 [active.window.html]
-  expected: CRASH
   [document.open() removes the document's children (non-active document without an associated Window object; createHTMLDocument)]
     expected: FAIL