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问题描述】CentOs系统中使用yum安装软件，出现如下错误
[root@localhost ~]# yum install gnuradio usrp
Loaded plugins: fastestmirror
Existing lock /var/run/yum.pid: another copy is running as pid 15069.
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  17 M RSS ( 29 MB VSZ)
    Started: Wed May 25 20:58:54 2011 - 2:10:35 ago
    State  : Sleeping, pid: 15069
终止后重新运行问题依然

【解决方案】：
在命令行输入：
#rm -f /var/run/yum.pid /sbin/service
#yum-updatesd restart
重新执行，问题解决