I have a jenkins (initially 1.596.2, later upgraded to .3) master on Ubuntu, with some jobs.
Last week i started seeing jobs being put on queue (pending—Waiting for next available executor). I checked the job config (Restrict where this project can be run) and it says Slaves in label: 1. The master workers all report idle. I upgraded to 1.596.3, restarted the node, but after a couple of hours of working (around 10-12) it starts to put jobs on queue although workers are idle.
It doesn't have any slaves, there are plenty of resources (node is a VM with 8 GB of RAM and 500 GB disk) and there are no errors in dmesg or logs.
What can i do to unblock it?