linux-kernel - Re: [PATCH bpf-next 0/2] bpf: Fix kprobe

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Date:   Tue, 22 Mar 2022 09:53:15 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH bpf-next 0/2] bpf: Fix kprobe_multi return probe
 backtrace

On Mon, 21 Mar 2022 08:01:11 +0100
Jiri Olsa <jolsa@...nel.org> wrote:

> hi,
> Andrii reported that backtraces from kprobe_multi program attached
> as return probes are not complete and showing just initial entry [1].
> 
> Sending the fix together with bpf_get_func_ip inline revert, which is
> no longer suitable.

OK, this series looks good to me.

Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org>

Thank you,

> 
> thanks,
> jirka
> 
> 
> ---
> [1] https://lore.kernel.org/bpf/CAEf4BzZDDqK24rSKwXNp7XL3ErGD4bZa1M6c_c4EvDSt3jrZcg@mail.gmail.com/T/#m8d1301c0ea0892ddf9dc6fba57a57b8cf11b8c51
> 
> Jiri Olsa (2):
>       Revert "bpf: Add support to inline bpf_get_func_ip helper on x86"
>       bpf: Fix kprobe_multi return probe backtrace
> 
>  kernel/bpf/verifier.c    | 21 +--------------------
>  kernel/trace/bpf_trace.c | 68 +++++++++++++++++++++++++++++++++++++-------------------------------
>  2 files changed, 38 insertions(+), 51 deletions(-)


-- 
Masami Hiramatsu <mhiramat@...nel.org>