Try to stabilize renderer process test

qutebrowser/mainwindow/tabbedbrowser.py

@@ -708,12 +708,16 @@ class TabbedBrowser(tabwidget.TabWidget):
         }
         msg = messages[status]
 
+        def show_error_page(html):
+            tab.set_html(html)
+            log.webview.debug("Showed error page for renderer termination")
+
         if qtutils.version_check('5.9'):
             url_string = tab.url(requested=True).toDisplayString()
             error_page = jinja.render(
                 'error.html', title="Error loading {}".format(url_string),
                 url=url_string, error=msg, icon='')
-            QTimer.singleShot(100, lambda: tab.set_html(error_page))
+            QTimer.singleShot(100, lambda: show_error_page(error_page))
             log.webview.error(msg)
         else:
             # WORKAROUND for https://bugreports.qt.io/browse/QTBUG-58698

tests/end2end/features/misc.feature

@@ -700,6 +700,7 @@ Feature: Various utility commands.
         And I open data/numbers/2.txt in a new tab
         And I run :open chrome://kill
         And I wait for "Renderer process was killed" in the log
+        And I wait for "Showed error page for renderer termination" in the log
         And I open data/numbers/3.txt
         Then no crash should happen