I'm trying to debug netfilter synproxy module with systemtap.
This is probe point I'm trying to add.
# stap -l 'module("ipt_SYNPROXY").statement("*")' | grep send_client_synack
module("ipt_SYNPROXY").statement("synproxy_send_client_synack@net/ipv4/netfilter/ipt_SYNPROXY.c:72")
And this is how stap script look like
probe module("ipt_SYNPROXY").statement("synproxy_send_client_synack@net/ipv4/netfilter/ipt_SYNPROXY.c:72"){
//some code
}
I'm getting below error when I try to run it
semantic error: no line records for net/ipv4/netfilter/ipt_SYNPROXY.c:72 [man error::dwarf]
semantic error: resolution failed in DWARF builder
semantic error: while resolving probe point: identifier 'module' at netfilter.stp:915:7
source: probe module("ipt_SYNPROXY").statement("synproxy_send_client_synack@net/ipv4/netfilter/ipt_SYNPROXY.c:72"){
^
semantic error: no match
I tried some of other probe points and realized that not all probe point give this error. For example below probe works fine
probe module("ipt_SYNPROXY").statement("ipv4_synproxy_hook@net/ipv4/netfilter/ipt_SYNPROXY.c:314"){
//some code
}
My kernel version 4.14.128 that I compiled myself. I suspects I miss something while compiling it.
