Yum hint Another app is currently holding the Yum lock

Yum hint Another app is currently holding the Yum lock; Waiting for it to exit ...

[[Email protected] ~]# yum repolistanother app is currently holding  the yum lock; waiting for it to exit...  the other  application is: PackageKit    Memory : 153 M RSS  (266 mb vsz)     Started: Thu Jul 12 00:03:05 2012  - 06:17 ago    state  : sleeping, pid: 14997another  app is currently holding the yum lock; waiting for it  to exit...  the other application is: packagekit     memory : 153 m rss  (266 mb vsz)     started: thu  jul 12 00:03:05 2012 - 06:19 ago    state  :  sleeping, pid: 14997 

It may be that the system is automatically upgraded and Yum is in a locked state.
There is already a Yum process running, kill it with Kill:

# kill-s 9 14997# PS aux|grep yumroot 6744 0.0 0.0 103260 0.0 pts/1 s+ 14:59 0:00 grep yumroot 14997 0.0 0 0    ? Z Sep19 0:01 [yumbackend.py] <defunct>1234

I'm sorry, kill can't deal with it.

You can disable the Yum process by forcing:

Workaround:
Rm-rf/var/run/yum.pid to forcibly unlock, and then your Yum can run

Yum hint Another app is currently holding the Yum lock