[testdb1@ip-testdb1~]$# yum install gcc
Loaded plugins: amazon-id, rhui-lb, security
Existing lock /var/run/yum.pid: another copy is running as pid 4447.
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: yum
Memory : 368 M RSS (933 MB VSZ)
Started: Mon May 8 18:19:54 2017 - 11:45:55 ago
State : Traced/Stopped, pid: 4447
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: yum
Memory : 368 M RSS (933 MB VSZ)
Started: Mon May 8 18:19:54 2017 - 11:45:57 ago
State : Traced/Stopped, pid: 4447
Solution:
Kill running yum process.
[testdb1@ip-testdb1~]# ps aux | grep yum
root 1546 0.0 0.1 103272 832 pts/1 S+ 06:07 0:00 grep yum
root 4447 1.0 62.2 955100 376404 pts/1 T May08 7:32 /usr/bin/python /usr/bin/yum install kmod-oracleasm
[testdb1@ip-testdb1~]$# kill -9 4447
[testdb1@ip-testdb1~]$]# ps aux | grep yum
root 1557 0.0 0.1 103272 832 pts/1 S+ 06:07 0:00 grep yum
[1]+ Killed yum install kmod-oracleasm