If you are getting following warning mail message from your cPanel server
Running `/usr/local/cpanel/scripts/updatenow –upcp –log=/var/cpanel/updatelogs/update.1434952321.log` failed, exited with code 29 (signal = 0)
An error was detected which prevented updatenow from completing normally.
Please review the enclosed log for further details
[20150622.015201] Detected version ‘22.214.171.124’ from version file.
[20150622.015201] Running version ‘126.96.36.199’ of updatenow.
[20150622.015600] Using mirror ‘188.8.131.52’ for host ‘httpupdate.cpanel.net’.
[20150622.015706] Using mirror ‘184.108.40.206’ for host ‘httpupdate.cpanel.net’.
[20150622.020037] Using mirror ‘220.127.116.11’ for host ‘httpupdate.cpanel.net’.
[20150622.020042] ***** FATAL: Unable to retrieve tier version info: Interrupted system call
[20150622.020042] The Administrator will be notified to review this output when this script completes
[20150622.020042] E Detected events which require user notification during updatenow. Will send iContact the log
Follow below steps to solve it.
Login to your server via SSH as user root.
Run following commands
/scripts/autorepair fix_duplicate_cpanel_rpms /scripts/upcp --force
The above commands will update cPanel to latest stable version. After update is completed, login in WHM as root to check if everything is fine.