From c067124ee4d44d40c5d27302c93399ff390a65c5 Mon Sep 17 00:00:00 2001
From: Edgar Arriaga <edgararriaga@google.com>
Date: Wed, 16 Feb 2022 10:19:49 -0800
Subject: [PATCH] Fix for crash in system_server due to
 IndexOutOfBoundsException

This became necessary since now we cancel compactions so it is possible
to have a list without elements when the compaction system is ready to
start a compaction.

Bug: 219901263
Test: Manual
Change-Id: I44d95d243ba95aea6c84283ddef1a38ffb6d3570
---
 .../core/java/com/android/server/am/CachedAppOptimizer.java    | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/services/core/java/com/android/server/am/CachedAppOptimizer.java b/services/core/java/com/android/server/am/CachedAppOptimizer.java
index 7af73ebda0c0e..3e60fc567610c 100644
--- a/services/core/java/com/android/server/am/CachedAppOptimizer.java
+++ b/services/core/java/com/android/server/am/CachedAppOptimizer.java
@@ -1105,6 +1105,9 @@ public final class CachedAppOptimizer {
                     int lastOomAdj = msg.arg1;
                     int procState = msg.arg2;
                     synchronized (mProcLock) {
+                        if(mPendingCompactionProcesses.isEmpty()) {
+                            return;
+                        }
                         proc = mPendingCompactionProcesses.remove(0);
                         opt = proc.mOptRecord;