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

使用yum安装计划任务功能，结果提示：

# 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...

可能是系统自动升级正在运行，yum在锁定状态中。
已经有一个yum进程在运行了，使用kill干掉它：

# 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>

很遗憾，kill对付不了它，那怎么办呢？

可以通过强制关掉yum进程：

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