On Tue, 2 Jan 2024 11:23:54 +0530
P K <pkopensrc@xxxxxxxxx> wrote:
> Hi,
>
> I am unable to trace nf_nat functions using kprobe with the latest kernel.
> Previously in kernel 6.1.55-1 it was working fine.
> Can someone please check if it's broken with the latest commit or i
> have to use it differently?
>
Note, attaching to kernel functions is never considered stable API and may
break at any kernel release.
Also, if the compiler decides to inline the function, and makes it no
longer visible in /proc/kallsyms then that too will cause this to break.
-- Steve
> Mentioned below are output:
> Kernel - 6.1.55-1
> / # bpftrace -e 'kprobe:nf_nat_ipv4_manip_pkt { printf("func called\n"); }'
> Attaching 1 probe...
> cannot attach kprobe, probe entry may not exist
> ERROR: Error attaching probe: 'kprobe:nf_nat_ipv4_manip_pkt'
>
>
>
> Kernel 6.1.55-1
> / # bpftrace -e 'kprobe:nf_nat_ipv4_manip_pkt { printf("func called\n"); }'
> Attaching 1 probe...
> func called
> func called
