yum update 升级报错的解决办法

# yum update 
Loaded plugins: fastestmirror 
Loading mirror speeds from cached hostfile 
Traceback (most recent call last): 
File “/usr/bin/yum”, line 29, in ? 
yummain.user_main(sys.argv[1:], exit_code=True) 
File “/usr/share/yum-cli/yummain.py”, line 229, in user_main 
errcode = main(args) 
File “/usr/share/yum-cli/yummain.py”, line 104, in main 
result, resultmsgs = base.doCommands() 
File “/usr/share/yum-cli/cli.py”, line 339, in doCommands 
self._getTs(needTsRemove) 
File “/usr/lib/python2.4/site-packages/yum/depsolve.py”, line 101, in _getTs 
self._getTsInfo(remove_only) 
File “/usr/lib/python2.4/site-packages/yum/depsolve.py”, line 112, in _getTsInfo 
pkgSack = self.pkgSack 
File “/usr/lib/python2.4/site-packages/yum/__init__.py”, line 591, in 
pkgSack = property(fget=lambda self: self._getSacks(), 
File “/usr/lib/python2.4/site-packages/yum/__init__.py”, line 434, in _getSacks 
self.repos.populateSack(which=repos) 
File “/usr/lib/python2.4/site-packages/yum/repos.py”, line 223, in populateSack 
self.doSetup() 
File “/usr/lib/python2.4/site-packages/yum/repos.py”, line 71, in doSetup 
self.ayum.plugins.run(‘postreposetup’) 
File “/usr/lib/python2.4/site-packages/yum/plugins.py”, line 176, in run 
func(conduitcls(self, self.base, conf, **kwargs)) 
File “/usr/lib/yum-plugins/fastestmirror.py”, line 181, in postreposetup_hook 
all_urls = FastestMirror(all_urls).get_mirrorlist() 
File “/usr/lib/yum-plugins/fastestmirror.py”, line 333, in get_mirrorlist 
self._poll_mirrors() 
File “/usr/lib/yum-plugins/fastestmirror.py”, line 376, 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 

yum –disableplugin=fastestmirror update