Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
probe::signal.systkill.return - Sending kill signal to a thread completed
SYNOPSIS
signal.systkill.return
VALUES
retstr
The return value to either __group_send_sig_info,
name
Name of the probe point
SystemTap Tapset Reference March 2016 PROBE::SIGNAL.SYST(3stap)