Bug 1868778 - Mark extensions process crashes as occurring in a background process. r=gsvelto,amejiamarmol,geckoview-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D195773

mobile/android/modules/geckoview/ChildCrashHandler.sys.mjs

@@ -60,8 +60,9 @@ export var ChildCrashHandler = {
           return;
         }
 
-        // If dumpID is empty the process was likely killed by the system and we therefore do not
-        // want to report the crash.
+        // If dumpID is empty the process was likely killed by the system and
+        // we therefore do not want to report the crash. This includes most
+        // "expected" extensions process crashes on Android.
         const dumpID = aSubject.get("dumpID");
         if (!dumpID) {
           Services.telemetry
@@ -73,12 +74,6 @@ export var ChildCrashHandler = {
         debug`Notifying child process crash, dump ID ${dumpID}`;
         const [minidumpPath, extrasPath] = getPendingMinidump(dumpID);
 
-        // Report GPU process crashes as occuring in a background process, and others as foreground.
-        const processType =
-          aTopic === "compositor:process-aborted"
-            ? "BACKGROUND_CHILD"
-            : "FOREGROUND_CHILD";
-
         let remoteType = this.childMap.get(childID);
         this.childMap.delete(childID);
 
@@ -88,6 +83,13 @@ export var ChildCrashHandler = {
           remoteType = remoteType.split("=")[0];
         }
 
+        // Report GPU and extension process crashes as occuring in a background
+        // process, and others as foreground.
+        const processType =
+          aTopic === "compositor:process-aborted" || remoteType === "extension"
+            ? "BACKGROUND_CHILD"
+            : "FOREGROUND_CHILD";
+
         lazy.EventDispatcher.instance.sendRequest({
           type: "GeckoView:ChildCrashReport",
           minidumpPath,

mobile/android/modules/geckoview/test/xpcshell/test_ChildCrashHandler.js

@@ -61,3 +61,42 @@ add_task(async function test_remoteType() {
   );
   Assert.equal("webIsolated", aData?.remoteType, "expected remote type prefix");
 });
+
+add_task(async function test_extensions_process_crash() {
+  const childID = 123;
+  const remoteType = "extension";
+  // Force-set a remote type for the process that we are going to "crash" next.
+  lazy.ChildCrashHandler.childMap.set(childID, remoteType);
+
+  // Mock a process crash being notified.
+  const propertyBag = Cc["@mozilla.org/hash-property-bag;1"].createInstance(
+    Ci.nsIWritablePropertyBag2
+  );
+  propertyBag.setPropertyAsBool("abnormal", true);
+  propertyBag.setPropertyAsAString("dumpID", "a-dump-id");
+
+  // Set up a listener to receive the crash report event emitted by the handler.
+  let listener;
+  const crashReportPromise = new Promise(resolve => {
+    listener = {
+      onEvent(aEvent, aData, aCallback) {
+        resolve([aEvent, aData]);
+      },
+    };
+  });
+  lazy.EventDispatcher.instance.registerListener(listener, [
+    "GeckoView:ChildCrashReport",
+  ]);
+
+  // Simulate a crash.
+  lazy.ChildCrashHandler.observe(propertyBag, "ipc:content-shutdown", childID);
+
+  const [aEvent, aData] = await crashReportPromise;
+  Assert.equal(
+    "GeckoView:ChildCrashReport",
+    aEvent,
+    "expected a child crash report"
+  );
+  Assert.equal("extension", aData?.remoteType, "expected remote type");
+  Assert.equal("BACKGROUND_CHILD", aData?.processType, "expected process type");
+});