From 2a52351de0b16dfe5daa0956a6301949bdff7ca6 Mon Sep 17 00:00:00 2001
From: Alan Jeffrey <ajeffrey@mozilla.com>
Date: Tue, 26 Apr 2016 14:32:11 -0500
Subject: [PATCH] Don't kill the root pipeline when randomly killing pipelines.

---
 components/compositing/constellation.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/components/compositing/constellation.rs b/components/compositing/constellation.rs
index 9e4db68f7ac..6702d20821f 100644
--- a/components/compositing/constellation.rs
+++ b/components/compositing/constellation.rs
@@ -1862,6 +1862,8 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
         if let Some((ref mut rng, _)) = self.random_pipeline_closure {
             if let Some(pipeline_id) = rng.choose(&*pipeline_ids) {
                 if let Some(pipeline) = self.pipelines.get(pipeline_id) {
+                    // Don't kill the root pipeline
+                    if pipeline.parent_info.is_none() { return; }
                     // Note that we deliberately do not do any of the tidying up
                     // associated with closing a pipeline. The constellation should cope!
                     info!("Randomly closing pipeline {}.", pipeline_id);