Many queries at https://quarry.wmcloud.org/ are stuck in the "running" state. It likely means that the query is somehow "slow" and takes forever to run or simply refuses to run. When one tries to stop such a query, a "500 Internal Server Error" will be displayed, which likely means that there might be a problem with completing the query.
Topic on Talk:Quarry
I have queries too that keep on running. But I can't stop them. Anyone any idea?
@GeoffreyT2000 @Dompi4602 - The bug has been resolved, and you will now see a "Stop Query" button. Happy searching!