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

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Date:   Fri, 26 Mar 2021 10:20:09 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     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,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        linux-ia64@...r.kernel.org,
        Abhishek Sagar <sagar.abhishek@...il.com>
Subject: Re: [PATCH -tip v4 10/12] x86/kprobes: Push a fake return address
 at kretprobe_trampoline

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.

-- Steve