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
meta-inf
android-studio-4.2.2
central-difference
django-admin-tools
data-science-studio
rxjs-pipeable-operators
jqte
adobe-director
node-oracle
tkpdfviewer
maven-wagon-plugin
spreadsheet
static-initialization
stubby4node
proof-assistant
fantom
pyro4
sslcontext
adbwireless
angular2-google-maps
virtualdub
printk
systemd-nspawn
global-functions
babel-plugin-react-intl
ytt
kora
mbt
azure-private-link
vs1053