linux-kernel - Re: [PATCH -tip v11 00/27] kprobes: Fix stacktrace with kretprobes on x86

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Date:   Thu, 30 Sep 2021 11:17:52 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kernel Team <kernel-team@...com>, linux-ia64@...r.kernel.org,
        Abhishek Sagar <sagar.abhishek@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Paul McKenney <paulmck@...nel.org>
Subject: Re: [PATCH -tip v11 00/27] kprobes: Fix stacktrace with kretprobes on x86

On Tue, Sep 28, 2021 at 7:24 PM Masami Hiramatsu <mhiramat@...nel.org> wrote:
>
> Hi Ingo,
>
> Can you merge this series to -tip tree since if I understand correctly,
> all kprobes patches still should be merged via -tip tree.
> If you don't think so anymore, I would like to handle the kprobe related
> patches on my tree. Since many kprobes fixes/cleanups have not been
> merged these months, it seems unhealthy now.
>
> Thank you,

Linus,

please suggest how to move these patches forward.
We've been waiting for this fix for months now.

> On Tue, 14 Sep 2021 23:38:27 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
>
> > Hello,
> >
> > This is the 11th version of the series to fix the stacktrace with kretprobe on x86.
> >
> > The previous version is here;
> >
> >  https://lore.kernel.org/all/162756755600.301564.4957591913842010341.stgit@devnote2/
> >
> > This version is rebased on the latest tip/master branch and includes the kprobe cleanup
> > series[1][2]. No code change.
> >
> > [1] https://lore.kernel.org/bpf/162748615977.59465.13262421617578791515.stgit@devnote2/
> > [2] https://lore.kernel.org/linux-csky/20210727133426.2919710-1-punitagrawal@gmail.com/
> >
> >
> > With this series, unwinder can unwind stack correctly from ftrace as below;