Pam x86_64 and i686 have conflicting man pages

   今天在使用yum做系统更新的时候出现如下提示，造成系统更新失败。

Transaction check error:file /usr/share/man/man8/faillock.8.gz from install of
pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64file /usr/share/man/man8/pam_env.8.gz from install of
pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64file /usr/share/man/man8/pam_faillock.8.gz from install of
pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64file /usr/share/man/man8/pam_unix.8.gz from install of
pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64file /usr/share/man/man8/pwhistory_helper.8.gz from install of
pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64

   解决办法：

yum clean all
yum distro-sync full

   执行完毕后就可以正常update了。