I'm using ftrace to trace ip_local_out() in kernel 5.4.20. I'm sure ip_local_out() is available to trace: /sys/kernel/debug/tracing # cat available_filter_funct
datacolumn
uninitialized-constant
jenkins-slack-plugins
sql-server-collation
pardot
text-widget
itanium
laravel-upgrade
skin
laravelcollective
long-filenames
keyman
benchmarkdotnet
mpg123
http-accept-language
recursion-schemes
mockserver
tsconfig-paths
fragment
uivisualeffectview
gmail-promo-tab
uint8array
ng2-pdfjs-viewer
uniform-server
stackedbarseries
qprintpreviewdialog
ssrs-2019
geomap
require-once
ants