[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