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

NAME
probe::stap.system.spawn - stap spawned new process
SYNOPSIS
stap.system.spawn
VALUES
pid
the pid of the spawned process
ret
the return value from posix_spawn
DESCRIPTION
Fires just after the call to posix_spawn.
SystemTap Tapset Reference March 2016 PROBE::STAP.SYSTEM(3stap)