We don't have an easy way in the GUI to kill individual jobs when they stall out, but there are a couple options when you have access to the command-line.
First, if you want to kill all running jobs, we have a task for that:
- php symfony jobs:clear
- It's covered in this section of the Troubleshooting documentation. In 2.7 I hope to overhaul the job scheduler page to make sure that all relevant management information is available in one place.
Keep in mind that this task will clear ALL jobs, including the history of those already completed, as well as any that are currently queued behind the stalled job. So, it's kind of a hammer as well, but one with official task support.
If you want the "needle" option, for now we need to use SQL to kill specific jobs. We've added some instructions on how to do so here:
Hope that helps!