linux-kernel - Re: Unpatched return thunk in use. This should not happen!

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Message-ID: <47e032a0-c9a0-4639-867b-cb3d67076eaf@suse.com>
Date: Tue, 26 Mar 2024 16:08:32 +0200
From: Nikolay Borisov <nik.borisov@...e.com>
To: Paul Menzel <pmenzel@...gen.mpg.de>, Thomas Gleixner
 <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
 Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org
Cc: LKML <linux-kernel@...r.kernel.org>, Marco Elver <elver@...gle.com>,
 kasan-dev@...glegroups.com
Subject: Re: Unpatched return thunk in use. This should not happen!

On 26.03.24 г. 14:40 ч., Paul Menzel wrote:
> Dear Linux folks,
> 
> 
> On a Dell XPS 13 9360/0596KF, BIOS 2.21.0 06/02/2022, Linux 6.9-rc1+ 
> built with
> 
>       CONFIG_KCSAN=y
> 

So the problem happens when KCSAN=y CONFIG_CONSTRUCTORS is also enabled 
and this results in an indirect call in do_mod_ctors():

    mod->ctors[i]();

When KCSAN is disabled, do_mod_ctors is empty, hence the warning is not 
printed.