'reload' is not supported by the stap-server script. The
ExecReload line in stap-server.service was calling
'stap-server restart' which stops the server and starts a
new one. This behavior is not expected or tolerated by systemd
which promptly sends SIGKILL to the new server.
We cannot supported 'reload' in systemctl. Note that 'restart'
is supported and works properly.
Type=oneshot
User=stap-server
ExecStart=/usr/bin/stap-server start
-ExecReload=/usr/bin/stap-server restart
ExecStop=/usr/bin/stap-server stop
RemainAfterExit=yes