linux-kernel - Re: [PATCH -tip v4 10/12] x86/kprobes: Push a fake return address at kretprobe

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Date:   Mon, 29 Mar 2021 23:58:15 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, X86 ML <x86@...nel.org>,
        Daniel Xu <dxu@...uu.xyz>, 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,
        linux-ia64@...r.kernel.org,
        Abhishek Sagar <sagar.abhishek@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PATCH -tip v4 10/12] x86/kprobes: Push a fake return address at
 kretprobe_trampoline

On Fri, Mar 26, 2021 at 10:20:09AM -0400, Steven Rostedt wrote:
> On Fri, 26 Mar 2021 21:03:49 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > I confirmed this is not related to this series, but occurs when I build kernels with different
> > configs without cleanup.
> > 
> > Once I build kernel with CONFIG_UNWIND_GUESS=y (for testing), and after that,
> > I build kernel again with CONFIG_UNWIND_ORC=y (but without make clean), this
> > happened. In this case, I guess ORC data might be corrupted?
> > When I cleanup and rebuild, the stacktrace seems correct.
> 
> Hmm, that should be fixed. Seems like we are missing a dependency somewhere.

Thomas reported something similar: for example arch/x86/kernel/head_64.o
doesn't get rebuilt when changing unwinders.

  https://lkml.kernel.org/r/87tuqublrb.fsf@nanos.tec.linutronix.de

Masahiro, any idea how we can force a full tree rebuild when changing
the unwinder?

-- 
Josh