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

Symptoms

When running upcp, you encounter an error similar to the following.

[/usr/local/cpanel/scripts/rpmup] Another app is currently holding the yum lock; waiting for it to exit

Description

This can occur when a package is being updated or the update transaction has stalled.

Workaround

You will need to identify the process to determine if the transaction is still running or if action should be taken to end the process. If the package installation is ongoing, it should be allowed to complete normally before attempting another cPanel update.

1. Access the server's command line as the 'root' user via SSH or "Terminal" in WHM.
2. Run the following command to find the process holding the yum lock.

   ps auxf | egrep 'yum|dnf' | grep -v grep

An actively running package installation should not be terminated or interrupted.

Additional Resources

How to Kill a Hung Process