Program: 8285
Project: 8285
Buggy source:
/** 
 * 1. Get keys which have been updated recently and therefore do not need to be updated now 2. Get list of all keys and filter out ones that don't need to be updated 3. Return keys to be updated
 * @return list of keys that require update
 */
private ArrayList<ParcelableKeyRing> getKeysToUpdate(Context context){
  final int INDEX_UPDATED_KEYS_MASTER_KEY_ID=0;
  final int INDEX_LAST_UPDATED=1;
  final long TIME_MAX=1;
  final long CURRENT_TIME=GregorianCalendar.getInstance().getTimeInMillis() / 1000;
  Log.e("String_Node_Str","String_Node_Str" + TIME_MAX + "String_Node_Str"+ CURRENT_TIME);
  Cursor updatedKeysCursor=context.getContentResolver().query(KeychainContract.UpdatedKeys.CONTENT_URI,new String[]{KeychainContract.UpdatedKeys.MASTER_KEY_ID,KeychainContract.UpdatedKeys.LAST_UPDATED},"String_Node_Str" + KeychainContract.UpdatedKeys.LAST_UPDATED + "String_Node_Str"+ TIME_MAX,new String[]{"String_Node_Str" + CURRENT_TIME},null);
  ArrayList<Long> ignoreMasterKeyIds=new ArrayList<>();
  while (updatedKeysCursor.moveToNext()) {
    long masterKeyId=updatedKeysCursor.getLong(INDEX_UPDATED_KEYS_MASTER_KEY_ID);
    Log.d(Constants.TAG,"String_Node_Str" + masterKeyId + "String_Node_Str"+ updatedKeysCursor.getLong(INDEX_LAST_UPDATED)+ "String_Node_Str");
    ignoreMasterKeyIds.add(masterKeyId);
  }
  updatedKeysCursor.close();
  final int INDEX_MASTER_KEY_ID=0;
  final int INDEX_FINGERPRINT=1;
  Cursor keyCursor=context.getContentResolver().query(KeychainContract.KeyRings.buildUnifiedKeyRingsUri(),new String[]{KeychainContract.KeyRings.MASTER_KEY_ID,KeychainContract.KeyRings.FINGERPRINT},null,null,null);
  if (keyCursor == null) {
    return new ArrayList<>();
  }
  ArrayList<ParcelableKeyRing> keyList=new ArrayList<>();
  while (keyCursor.moveToNext()) {
    long keyId=keyCursor.getLong(INDEX_MASTER_KEY_ID);
    if (ignoreMasterKeyIds.contains(keyId)) {
      continue;
    }
    String fingerprint=KeyFormattingUtils.convertFingerprintToHex(keyCursor.getBlob(INDEX_FINGERPRINT));
    String hexKeyId=KeyFormattingUtils.convertKeyIdToHex(keyId);
    keyList.add(new ParcelableKeyRing(fingerprint,hexKeyId,null));
  }
  keyCursor.close();
  return keyList;
}

Fixed version (ground truth):
/** 
 * 1. Get keys which have been updated recently and therefore do not need to be updated now 2. Get list of all keys and filter out ones that don't need to be updated 3. Return keys to be updated
 * @return list of keys that require update
 */
private ArrayList<ParcelableKeyRing> getKeysToUpdate(Context context){
  final int INDEX_UPDATED_KEYS_MASTER_KEY_ID=0;
  final int INDEX_LAST_UPDATED=1;
  final long CURRENT_TIME=GregorianCalendar.getInstance().getTimeInMillis() / 1000;
  Cursor updatedKeysCursor=context.getContentResolver().query(KeychainContract.UpdatedKeys.CONTENT_URI,new String[]{KeychainContract.UpdatedKeys.MASTER_KEY_ID,KeychainContract.UpdatedKeys.LAST_UPDATED},"String_Node_Str" + KeychainContract.UpdatedKeys.LAST_UPDATED + "String_Node_Str"+ KEY_UPDATE_LIMIT,new String[]{"String_Node_Str" + CURRENT_TIME},null);
  ArrayList<Long> ignoreMasterKeyIds=new ArrayList<>();
  while (updatedKeysCursor.moveToNext()) {
    long masterKeyId=updatedKeysCursor.getLong(INDEX_UPDATED_KEYS_MASTER_KEY_ID);
    Log.d(Constants.TAG,"String_Node_Str" + masterKeyId + "String_Node_Str"+ updatedKeysCursor.getLong(INDEX_LAST_UPDATED)+ "String_Node_Str");
    ignoreMasterKeyIds.add(masterKeyId);
  }
  updatedKeysCursor.close();
  final int INDEX_MASTER_KEY_ID=0;
  final int INDEX_FINGERPRINT=1;
  Cursor keyCursor=context.getContentResolver().query(KeychainContract.KeyRings.buildUnifiedKeyRingsUri(),new String[]{KeychainContract.KeyRings.MASTER_KEY_ID,KeychainContract.KeyRings.FINGERPRINT},null,null,null);
  if (keyCursor == null) {
    return new ArrayList<>();
  }
  ArrayList<ParcelableKeyRing> keyList=new ArrayList<>();
  while (keyCursor.moveToNext()) {
    long keyId=keyCursor.getLong(INDEX_MASTER_KEY_ID);
    if (ignoreMasterKeyIds.contains(keyId)) {
      continue;
    }
    Log.d(Constants.TAG,"String_Node_Str" + keyId + "String_Node_Str");
    String fingerprint=KeyFormattingUtils.convertFingerprintToHex(keyCursor.getBlob(INDEX_FINGERPRINT));
    String hexKeyId=KeyFormattingUtils.convertKeyIdToHex(keyId);
    keyList.add(new ParcelableKeyRing(fingerprint,hexKeyId,null));
  }
  keyCursor.close();
  return keyList;
}