linux-kernel - Re: [PATCH 0/8] unwind, arm64: add sframe unwinder for kernel

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Message-ID: <CAPhsuW4ct6W_4B0LFEjLePH1pAeNm4h8ePuQ3HcSoknXhQWN0w@mail.gmail.com>
Date: Wed, 12 Feb 2025 18:40:33 -0800
From: Song Liu <song@...nel.org>
To: Indu Bhagat <indu.bhagat@...cle.com>
Cc: Weinan Liu <wnliu@...gle.com>, Josh Poimboeuf <jpoimboe@...nel.org>, 
	Steven Rostedt <rostedt@...dmis.org>, Peter Zijlstra <peterz@...radead.org>, 
	Mark Rutland <mark.rutland@....com>, roman.gushchin@...ux.dev, 
	Will Deacon <will@...nel.org>, Ian Rogers <irogers@...gle.com>, linux-toolchains@...r.kernel.org, 
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org, 
	joe.lawrence@...hat.com, linux-arm-kernel@...ts.infradead.org, 
	Puranjay Mohan <puranjay@...nel.org>
Subject: Re: [PATCH 0/8] unwind, arm64: add sframe unwinder for kernel

On Wed, Feb 12, 2025 at 4:10 PM Indu Bhagat <indu.bhagat@...cle.com> wrote:
>
> On 2/12/25 3:32 PM, Song Liu wrote:
> > I run some tests with this set and my RFC set [1]. Most of
> > the test is done with kpatch-build. I tested both Puranjay's
> > version [3] and my version [4].
> >
> > For gcc 14.2.1, I have seen the following issue with this
> > test [2]. This happens with both upstream and 6.13.2.
> > The livepatch loaded fine, but the system spilled out the
> > following warning quickly.
> >
>
> In presence of the issue
> https://sourceware.org/bugzilla/show_bug.cgi?id=32666, I'd expect bad
> data in SFrame section.  Which may be causing this symptom?
>
> To be clear, the issue affects loaded kernel modules.  I cannot tell for
> certain - is there module loading involved in your test ?

The KLP is a module, I guess that is also affected?

During kpatch-build, we added some logic to drop the .sframe section.
I guess this is wrong, as we need the .sframe section when we apply
the next KLP. However, I don't think the issue is caused by missing
.sframe section.

Thanks,
Song