The next pipeline get stuck (pending infinitely) when cancel o job

I got this issue when hit Cancel button on Pipeline page. Instead of this job will terminate or kill all the command in this job, it still run in background, this cause the next pipeline will be hang off (in Pending status infinitely). I have to restart gitlab-runner or kill -9 <command id> to suffer this problem. It's really a bug rather than a expected behavior.

Thanks