Unable to update drupal core using drush

I have tried to update the drupal core using drush and it stuck. Please see below the below details that would be helpful :

[root@test]# drush up -v drupal
Initialized Drupal 6.32 root directory at /home/test1/public_html                                                                                      [notice]
Initialized Drupal site default at sites/default                                                                                                                [notice]
Loading release_info engine.                                                                                                                                    [notice]
Loading version_control engine.                                                                                                                                 [notice]
Loading package_handler engine.                                                                                                                                 [notice]
Executing: wget --version
/usr/bin/php  -d magic_quotes_gpc=Off -d magic_quotes_runtime=Off -d magic_quotes_sybase=Off /usr/share/pear/drush/drush.php --php=/usr/bin/php                 [notice]
--php-options=' -d magic_quotes_gpc=Off -d magic_quotes_runtime=Off -d magic_quotes_sybase=Off'  --backend=2 --verbose
--root=/home/test/public_html --uri=http://default  pm-updatestatus drupal 2>&1

Updates stuck there; see below the drush status :

[root@test]# drush status
 Drupal version                  :  6.32
 Site URI                        :  http://default
 Database driver                 :  mysqli
 Database username               :  testd
 Database name                   :  testd
 Database                        :  Connected
 Drupal bootstrap                :  Successful
 Drupal user                     :  Anonymous
 Default theme                   :  test_theme
 Administration theme            :  garland
 PHP executable                  :  /usr/bin/php
 PHP configuration               :  /etc/php.ini
 PHP OS                          :  Linux
 Drush version                   :  6.1.0
 Drush configuration             :
 Drush alias files               :
 Drupal root                     :  /home/test/public_html
 Site path                       :  sites/default
 File directory path             :  sites/default/files
 Temporary file directory path   :  /tmp

Please let me know how can I resolve this ?