Re: [RFC 0/1] BPF tracing for arm64 using fprobe

[KP Singh]

On Mon, Nov 21, 2022 at 3:17 PM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> On Mon, Nov 21, 2022 at 02:47:10PM +0100, KP Singh wrote:
>
> > > > How do I know that a function return was modified by BPF? If I'm debugging
> >
> > You can list the BPF programs that are loaded in the kernel with
> >
> > # bpftool prog list
>
> Only when you have access to the machine; most cases it's people sending
> random splats by email.

Good point, What about having information about loaded BPF programs in the
kernel stack traces and sharing bytecode, somehow, like in crash dumps?

>
> > Also, the BPF programs show up in call stacks when you are debugging.
>
> Only when it splats inside the BPF part, not when it splats after
> because BPF changed semantics of a function.
>
>