CentOS yum 段错误 (core dumped)解决方法

今天在yum install 或者yum update的时候都提示段错误(core dumped)，然后终止运行了。

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[root@lee ~]# yum -y update
Loaded plugins: fastestmirror, refresh-packagekit
Determining fastest mirrors
* base: mirror.esocc.com
* extras: mirror.esocc.com
* soluslabs: mirror.us1.soluslabs.net
* updates: mirror.esocc.com
base | 3.7 kB 00:00
base/primary_db | 4.4 MB 00:14
extras | 3.4 kB 00:00
extras/primary_db | 18 kB 00:00
soluslabs | 951 B 00:00
soluslabs/primary | 11 kB 00:00
段错误 (core dumped)

到谷歌上找各种大虾的文章还是无济于事，只好认真查看错误！首先我确定了不是因为Python版本的原因，因为之前安装了一个Python2.7.4。

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# vim /usr/bin/yum

查看第一行

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#!/usr/bin/python2.6
import sys
try:
import yum
except ImportError:
print >> sys.stderr, """
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

%s

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
%s

If you cannot solve this problem yourself, please go to
the yum faq at:
http://yum.baseurl.org/wiki/Faq

""" % (sys.exc_value, sys.version)
sys.exit(1)

sys.path.insert(0, '/usr/share/yum-cli')
try:
import yummain
yummain.user_main(sys.argv[1:], exit_code=True)
except KeyboardInterrupt, e:
print >> sys.stderr, "nnExiting on user cancel."
sys.exit(1)

第一行是

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#!/usr/bin/python2.6

直接看这个Python2.6是不是有问题

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[root@lee ~]# /usr/bin/python2.6 -V
Python 2.6.6

正确识别版本号，没问题。在yum clean all 以后都无济于事的时候，我突然想到会不会/etc/yum.repos.d/目录下多了东西？