linux-kernel - Re: linux-next: new objtool warnings

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Message-ID: <20251105143027.214f491c@canb.auug.org.au>
Date: Wed, 5 Nov 2025 14:30:27 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: new objtool warnings

Hi Peter,

On Mon, 3 Nov 2025 10:38:04 +0100 Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Mon, Nov 03, 2025 at 08:32:56PM +1100, Stephen Rothwell wrote:
> > 
> > On Mon, 3 Nov 2025 10:10:06 +0100 Peter Zijlstra <peterz@...radead.org> wrote:  
> > >
> > > On Fri, Oct 31, 2025 at 11:15:15AM +1100, Stephen Rothwell wrote:  
> > > > 
> > > > My x86_64 allmodconfig builds started producing these warnings today:
> > > > 
> > > > vmlinux.o: warning: objtool: user_exc_vmm_communication+0x15a: call to __kasan_check_read() leaves .noinstr.text section
> > > > vmlinux.o: warning: objtool: exc_debug_user+0x182: call to __kasan_check_read() leaves .noinstr.text section
> > > > vmlinux.o: warning: objtool: exc_int3+0x123: call to __kasan_check_read() leaves .noinstr.text section
> > > > vmlinux.o: warning: objtool: noist_exc_machine_check+0x17a: call to __kasan_check_read() leaves .noinstr.text section
> > > > vmlinux.o: warning: objtool: fred_exc_machine_check+0x17e: call to __kasan_check_read() leaves .noinstr.text section
> > > > 
> > > > I can't easily tell what caused this change, sorry.    
> > > 
> > > What compiler? This smells like a broken compiler, these are all
> > > noinstr and that very much has __no_sanitize_address.  
> > 
> > And today I didn't get them.  So who knows?  I did *not* change compiler
> > since Friday.  
> 
> Oh well, lets chalk it up to gremlins for now. I'll have a look if it
> happens again/reliably.

These objtool messages have returned today.  No change in compiler.

-- 
Cheers,
Stephen Rothwell

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