yum --showduplicates
planet.centos.org提到的真挺好用的，如果最新版本有问题，可以这样通过查询历史版本，直接安装没有问题的老版本：
[simonsun@magic ~]$ sudo yum --showduplicates list audacity
Loaded plugins: aliases, allowdowngrade, changelog,
: downloadonly, fastestmirror, filter-data,
: kernel-module, keys, kmod, list-data, merge-
: conf, priorities, protect-packages,
: protectbase, refresh-updatesd, security,
: tmprepo, tsflags, upgrade-helper, verify,
: versionlock
Loading mirror speeds from cached hostfile
* addons: centos.cs.nctu.edu.tw
* rpmforge: apt.sw.be
* extras: centos.mirror.cdnetworks.com
* updates: centos.mirror.cdnetworks.com
* base: centos.mirror.cdnetworks.com
* freshrpms: ayo.ie.freshrpms.net
Reading version lock configuration
0 packages excluded due to repository protections
Installed Packages
audacity.i386 1.3.4-2.el5.rf installed
Available Packages
audacity.i386 1.3.0b-1.el5.rf rpmforge
audacity.i386 1.3.4-1.el5.rf rpmforge
[simonsun@magic music]$ sudo yum --showduplicates list kernel
Loaded plugins: aliases, changelog, downloadonly, fastestmirror, filter-data, keys, kmod, list-data, priorities, protect-packages,
: protectbase, security, tmprepo, verify, versionlock
Loading mirror speeds from cached hostfile
* addons: ftp.hostrino.com
* base: ftp.hostrino.com
* extras: ftp.hostrino.com
* freshrpms: ayo.ie.freshrpms.net
* rpmforge: ftp-stud.fht-esslingen.de
* updates: ftp.hostrino.com
0 packages excluded due to repository protections
Reading version lock configuration
Installed Packages
kernel.i686 2.6.18-164.10.1.el5 installed
Available Packages
kernel.i686 2.6.18-164.el5 base
kernel.i686 2.6.18-164.2.1.el5 updates
kernel.i686 2.6.18-164.6.1.el5 updates
kernel.i686 2.6.18-164.9.1.el5 updates
kernel.i686 2.6.18-164.10.1.el5 updates