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
android-multi-module
aadhaar
mlt
scrypto
win32ole
versions-maven-plugin
splunk-calculation
csvhelper
key-bindings
nps
dynamics-al
stubby4j
openvino
angular-breadcrumb
microsoft-health-bot
password-retrieval
karma-webpack
swiftui-tabview
serve
verification
genetic
.net-attributes
assertj
cpu-usage
lr
apachebench
nuxt-link
stable-marriage
unqualified-name
remix