Jenkins Master with 4 executors, uses gearman and zuul to trigger jobs based on commits on gerrit.

I also have a job that is triggered on timer (to check smth).

After the upgrade, the job triggered on timer doesn't run anymore ("pending—Waiting for next available executor on master").
Master has 4 idle workers

Build Executor Status
1	Idle		
2	Idle		
3	Idle		
4	Idle

Jenkins logs don't show any errors when a job is triggered.