yum repolist

There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

/lib64/liblzma.so.5: undefined symbol: lzma_stream_footer_encode, version XZ_5.0

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:
2.7.5 (default, Aug  4 2017, 00:39:18) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)]

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

在服务器使用 yum 安装软件的时候突然出现上面的错误机器一开始确定是正常的然后检查 /lib64/liblzma.so.5 以及源文件 /usr//lib64/liblzma.so.5.2.2 md5 值都发生了改变正常 MD5：81615f916ede2689b4ff90b3524b6e20 /usr/lib64/liblzma.so.5.2.2 异常 md5: 3aee895ac421108f71735d78219f7a11 /usr/lib64/liblzma.so.5.2.2

stat 查看库文件的修改时间没有任何问题而且机器也没有被入侵过的痕迹：

# stat /usr/lib64/liblzma.so.5.2.2
 File: ‘/usr/lib64/liblzma.so.5.2.2 ’
 Size: 157424    	Blocks: 320        IO Block: 4096   regular file
Device: fd01h/64769d	Inode: 99093       Links: 1
Access: (0755/-rwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2017-12-11 20:38:32.134000000 +0800
Modify: 2016-11-05 23:27:57.000000000 +0800
Change: 2017-06-11 19:48:14.454000000 +0800
Birth: -

使用 rpm -V 验证 rpm 包完整性也是提示该库 md5 不一致：

# rpm -V xz-libs 
..5......    /usr/lib64/liblzma.so.5.2.2

我们运行的业务有 pptp xl2tp ipsec openvpn 有大佬有类似的经验吗该如何排查现在的情况我拷贝一个 md5 正常的库回去 yum 就正常可用了

补充：拷贝回去虽然正常可用但是发现了这个日志

Jul 26 16:50:46 hosstname kernel: systemd-udevd[31072]: segfault at 30f0 ip 00000000000030f0 sp 00007ffffebdc1d8 error 14 in systemd-udevd[564a9bebf000+4b000]
Jul 26 16:50:46 hostname kernel: systemd-udevd[31073]: segfault at 30f0 ip 00000000000030f0 sp 00007ffffebdc1d8 error 14 in systemd-udevd[564a9bebf000+4b000]

/lib64/liblzma.so.5 被修改问题求助

yum repolist