Simple fix for this one, kill the task directly by it’s PID. Using ps , grep and sed, to select correct process.

When executing this in live production, take especial care.

# xe task-list 
uuid ( RO)                : 7cb8b30b-563c-db9e-7682-e25aac2b2f07
          name-label ( RO): SR.scan
    name-description ( RO): 
              status ( RO): pending
            progress ( RO): 0.000
[root@21-16-246-494694 ~]# date
Thu Nov 10 11:41:45 UTC 2016
[root@xenhost ~]# kill -TERM $(ps fauxww | grep "[t]ap-ctl close" | sed -e "s/.*-p //" | awk '{print $1}')