Our Jenkins server has a job that has been running for three days, but is not doing anything. Clicking the little X in the corner does nothing, and the console output log do
I usually use jenkins-cli in such cases. You can download the jar from a page http://your-jenkins-host:PORT/cli . Then run
java -jar jenkins-cli.jar delete-builds name_of_job_to_delete hanging_job_number
Auxiliary info:
You may also pass a range of builds like 350:400.
General help available by running
java -jar jenkins-cli.jar help
Context command help for delete-builds by
java -jar jenkins-cli.jar delete-builds