Since roughlty 3 weeks our Jenkins instance started to have finished jobs which don't release the worker. They appear to be running but when we go to the job console there is a jenkins message saying 'SUCCESS' or 'FAILURE'. Since 2 days this issue occurs several time a day. This morning i tried to rollback to the latest LTS version but without success. You will find the thread dump attached.

Any help will be appreciated as our users are strated to complain and we really don't know how to sort it out.

Jenkins Version: 2.150.3
Plugins: jenkins-plugins.txt

^{Java version:  openjdk version "1.8.0_201" build "1.8.0_201_b09" 64-Bit Server VM (build 25.201-b09, mixed mode)}

May be related with JENKINS-56480

Regards