[root@server home]# yum update
Loading "fastestmirror" plugin
Loading mirror speeds from cached hostfile
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in ?
    yummain.main(sys.argv[1:])
  File "/usr/share/yum-cli/yummain.py", line 105, in main
    result, resultmsgs = base.doCommands()
  File "/usr/share/yum-cli/cli.py", line 289, in doCommands
    self._getTs()
  File "/usr/lib/python2.4/site-packages/yum/depsolve.py", line 85, in _getTs
    self._getTsInfo()
  File "/usr/lib/python2.4/site-packages/yum/depsolve.py", line 91, in _getTsInfo
    self._tsInfo.setDatabases(self.rpmdb, self.pkgSack)
  File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 537, in <lambda>
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 392, in _getSacks
    self.repos.populateSack(which=repos)
  File "/usr/lib/python2.4/site-packages/yum/repos.py", line 214, in populateSack
    self.doSetup()
  File "/usr/lib/python2.4/site-packages/yum/repos.py", line 66, in doSetup
    self.ayum.plugins.run('postreposetup')
  File "/usr/lib/python2.4/site-packages/yum/plugins.py", line 169, in run
    func(conduitcls(self, self.base, conf, **kwargs))
  File "/usr/lib/yum-plugins/fastestmirror.py", line 90, in postreposetup_hook
    repomirrors[str(repo)] = FastestMirror(repo.urls).get_mirrorlist()
  File "/usr/lib/yum-plugins/fastestmirror.py", line 142, in get_mirrorlist
    self._poll_mirrors()
  File "/usr/lib/yum-plugins/fastestmirror.py", line 155, in _poll_mirrors
    pollThread.start()
  File "/usr/lib/python2.4/threading.py", line 416, in start
    _start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread