Fix IndexOutOfBoundsException in systemserver

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
CRs-Fixed: 3121545

Change-Id: I44d95d243ba95aea6c84283ddef1a38ffb6d3570
(cherry picked from commit 54f53e0cf51cf078961b0254fbabd48c9a151985)

Change-Id: Ib17b6ae4112e1b10e415de27bde8e2844d69c91d

1 files changed, 3 insertions, 0 deletions

diff --git a/services/core/java/com/android/server/am/CachedAppOptimizer.java b/services/core/java/com/android/server/am/CachedAppOptimizer.java
index 6ee41eff1fcf..30b63940de7f 100644
--- a/services/core/java/com/android/server/am/CachedAppOptimizer.java
+++ b/services/core/java/com/android/server/am/CachedAppOptimizer.java
@@ -1191,6 +1191,9 @@ 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;