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[root@niel rpm-gpg]# yum update

Loaded plugins: fastestmirror, refresh-packagekit

Determining fastest mirrors

Traceback (most recent call last):

  File "/usr/bin/yum", line 29, in <module>

    yummain.user_main(sys.argv[1:], exit_code=True)

  File "/usr/share/yum-cli/yummain.py", line 285, in user_main

    errcode = main(args)

  File "/usr/share/yum-cli/yummain.py", line 136, in main

    result, resultmsgs = base.doCommands()

  File "/usr/share/yum-cli/cli.py", line 434, in doCommands

    self._getTs(needTsRemove)

  File "/usr/lib/python2.6/site-packages/yum/depsolve.py", line 99, in _getTs

    self._getTsInfo(remove_only)

  File "/usr/lib/python2.6/site-packages/yum/depsolve.py", line 110, in _getTsInfo

    pkgSack = self.pkgSack

  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 897, in <lambda>

    pkgSack = property(fget=lambda self: self._getSacks(),

  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 682, in _getSacks

    self.repos.populateSack(which=repos)

  File "/usr/lib/python2.6/site-packages/yum/repos.py", line 265, in populateSack

    self.doSetup()

  File "/usr/lib/python2.6/site-packages/yum/repos.py", line 92, in doSetup

    self.ayum.plugins.run('postreposetup')

  File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 184, in run

    func(conduitcls(self, self.base, conf, **kwargs))

  File "/usr/lib/yum-plugins/fastestmirror.py", line 191, in postreposetup_hook

    all_urls = FastestMirror(all_urls).get_mirrorlist()

  File "/usr/lib/yum-plugins/fastestmirror.py", line 349, in get_mirrorlist

    self._poll_mirrors()

  File "/usr/lib/yum-plugins/fastestmirror.py", line 393, in _poll_mirrors

    pollThread.start()

  File "/usr/lib/python2.6/threading.py", line 474, in start

    _start_new_thread(self.__bootstrap, ())

thread.error: can't start new thread