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

NAME
probe::tcp.disconnect - TCP socket disconnection
SYNOPSIS
tcp.disconnect
VALUES
name
Name of this probe
family
IP address family
dport
TCP destination port
sport
TCP source port
saddr
A string representing the source IP address
sock
Network socket
daddr
A string representing the destination IP address
flags
TCP flags (e.g. FIN, etc)
CONTEXT
The process which disconnects tcp
SystemTap Tapset Reference March 2016 PROBE::TCP.DISCONN(3stap)