linux-kernel - Re: [PATCH -tip 0/5] kprobes: Fix stacktrace in kretprobes

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Date:   Wed, 10 Mar 2021 14:46:14 -0800
From:   Daniel Xu <dxu@...uu.xyz>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>, X86 ML <x86@...nel.org>,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org, kuba@...nel.org,
        mingo@...hat.com, ast@...nel.org, tglx@...utronix.de,
        kernel-team@...com, yhs@...com
Subject: Re: [PATCH -tip 0/5] kprobes: Fix stacktrace in kretprobes

On Thu, Mar 11, 2021 at 12:55:09AM +0900, Masami Hiramatsu wrote:
> Hi Josh and Daniel,
<...>

> commit aa452d999b524b1851f69cc947be3e1a2f3ca1ec
> Author: Masami Hiramatsu <mhiramat@...nel.org>
> Date:   Sat Mar 6 08:34:51 2021 +0900
> 
>     x86/unwind/orc: Fixup kretprobe trampoline entry
>     
>     Since the kretprobe replaces the function return address with
>     the kretprobe_trampoline on the stack, the ORC unwinder can not
>     continue the stack unwinding at that point.
>     
>     To fix this issue, correct state->ip as like as function-graph
>     tracer in the unwind_next_frame().
>     
>     Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> 

I applied your original patchset + Josh's patch + this patch and can
confirm it works for bpftrace + kretprobes.

Tested-by: Daniel Xu <dxu@...uu.xyz>