Upon clicking Change End date on a subscription screen the following error emerges:
[2016/07/25 11:47:20] [FATAL]  [Error::throw] URI handler (HSPC::Billing::Subscription->teaser_office) error: Can't obtain mutex 'subscr_034670' during timeout 60 seconds (See /var/log/hspc/rep2016-07-25_11-47-20 for details)
The most probable issue cause is low MySQL performance caused by long running SQL queries.
To resolve the issue, please enable slow query logging in
#vi /etc/my.cnf [mysqld] long_query_time = 60 log-slow-queries = /tmp/mysql-slow.log
and restart MySQL for the changes to come into force:
#service mysql restart
Reproduce the issue and check
/tmp/mysql-slow.log for the queries that cause the delay.