Yum prompt another app is currently holding the yum lock; waiting for it to exit...

Use yum Install the scheduled tasks feature , The results suggest ：

# yum -y install vixie-cron

Loaded plugins: fastestmirror, refresh-packagekit, security

Existing lock /var/run/yum.pid: another copy is running as pid 25960.

Another app is currently holding the yum lock; waiting for it to exit...

Maybe the automatic upgrade of the system is running ,yum In the locked state . 

There is already one yum The process is running , Use kill Kill it ：

# kill -s 9 25960

# ps aux|grep yum

root      6744  0.0  0.0 103260   900 pts/1    S+   14:59   0:00 grep yum

root     25960  0.0  0.0      0     0 ?        Z    Sep19   0:01 [yumBackend.py] <defunct>

unfortunately ,kill I can't deal with it , Then what shall I do? ？

You can turn it off by force yum process ：

#rm -f /var/run/yum.pid

And then you can use it yum 了 .