Loading "security" plugin
Loading "fastestmirror" plugin
rpmdb: Lock table is out of available locker entries
rpmdb: Unknown locker ID: 903
error: db4 error(22) from db->close: Invalid argument
error: cannot open Packages index using db3 - Cannot allocate memory (12)
error: cannot open Packages database in /var/lib/rpm
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.main(sys.argv[1:])
  File "/usr/share/yum-cli/yummain.py", line 82, in main
    base.getOptionsConfig(args)
  File "/usr/share/yum-cli/cli.py", line 148, in getOptionsConfig
    disabled_plugins=opts.disableplugins)
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 155, in _getConfig
    self._conf = config.readMainConfig(startupconf)
  File "/usr/lib/python2.5/site-packages/yum/config.py", line 605, in readMainConfig
    yumvars['releasever'] = _getsysver(startupconf.installroot, startupconf.distroverpkg)
  File "/usr/lib/python2.5/site-packages/yum/config.py", line 672, in _getsysver
    idx = ts.dbMatch('provides', distroverpkg)
TypeError: rpmdb open failed