More fixes towards the race conditions in AMS

Bug: 142986887
Bug: 140108616
Test: Manual
Change-Id: I6e0bdc8c02bab54f6278096b3a3acadd97c064c6
Merged-In: I6e0bdc8c02bab54f6278096b3a3acadd97c064c6
(cherry picked from commit b2e84f0406)

services/core/java/com/android/server/am/AppErrors.java

@@ -312,7 +312,11 @@ class AppErrors {
             // and then the delayed summary kill will be a no-op.
             final ProcessRecord p = proc;
             mService.mHandler.postDelayed(
-                    () -> killAppImmediateLocked(p, "forced", "killed for invalid state"),
+                    () -> {
+                        synchronized (mService) {
+                            killAppImmediateLocked(p, "forced", "killed for invalid state");
+                        }
+                    },
                     5000L);
         }
     }