7.0.3 with clang 22.1.4 and full lto: objtool error

7.0.3 with clang 22.1.4 and full lto: objtool error

[Klaus Kusche]

I've no idea why this message was filtered,
but for some reason, my mailer shows it as sucessfully sent,
but it never arrived at LKML...

Hello,

with clang 22.1.4, I get an error in the "LD vmlinux.o" step
(full lto):
"objtool: bad .discard.annotate_insn entry: 609 of type 8"

Same kernel & same config compiles and runs nicely with clang 21.1.8.

I've attached the kernel config to
https://bugzilla.kernel.org/show_bug.cgi?id=221460

-- 
Prof. Dr. Klaus Kusche
Privat: Söllmnitz 32 d, D-07554 Gera/Söllmnitz
036695/859909 klaus.kusche@computerix.info https://www.computerix.info
Dienstlich: DHGE Gera, Weg der Freundschaft 4, D-07546 Gera
klaus.kusche@dhge.de https://www.dhge.de

linux 7.0.4 + clang 22.1.5 with thin or full lto still fails with objtool error

[Klaus Kusche]

The error I reported for linux 7.0.3 and clang 22.1.4 (see below)
still occurs with 7.0.4 and 22.1.5:
Compiling the kernel fails in the "LD vmlinux.o" step with
"vmlinux.o: error: objtool: bad .discard.annotate_insn entry: 
599 of type 8"

This time, I reproduced it with the vanilla kernel,
not the gentoo kernel, so there is no gentoo involved in the build.

It happens with both full LTO and thin LTO, only no LTO works.

My kernel config reproducing the error with vanilla 7.0.4 is in 
https://bugzilla.kernel.org/show_bug.cgi?id=221460

-- 
Klaus Kusche

-------- Forwarded Message --------
Subject: 7.0.3 with clang 22.1.4 and full lto: objtool error
Date: Mon, 4 May 2026 20:46:50 +0200
From: Klaus Kusche <klaus.kusche@computerix.info>
To: linux-kernel@vger.kernel.org, Josh Poimboeuf <jpoimboe@kernel.org>, peterz@infradead.org, Nathan Chancellor <nathan@kernel.org>

Hello,

with clang 22.1.4, I get an error in the "LD vmlinux.o" step
(full lto):
"objtool: bad .discard.annotate_insn entry: 609 of type 8"

Same kernel & same config compiles and runs nicely with clang 21.1.8.

I've attached the kernel config to
https://bugzilla.kernel.org/show_bug.cgi?id=221460

Re: linux 7.0.4 + clang 22.1.5 with thin or full lto still fails with objtool error

[Nathan Chancellor]

On Thu, May 07, 2026 at 09:31:36PM +0200, Klaus Kusche wrote:
> 
> The error I reported for linux 7.0.3 and clang 22.1.4 (see below)
> still occurs with 7.0.4 and 22.1.5:
> Compiling the kernel fails in the "LD vmlinux.o" step with
> "vmlinux.o: error: objtool: bad .discard.annotate_insn entry: 
> 599 of type 8"
> 
> This time, I reproduced it with the vanilla kernel,
> not the gentoo kernel, so there is no gentoo involved in the build.
> 
> It happens with both full LTO and thin LTO, only no LTO works.
> 
> My kernel config reproducing the error with vanilla 7.0.4 is in 
> https://bugzilla.kernel.org/show_bug.cgi?id=221460

Just to close the loop for other folks in this thread, this is now being
tracked in our downstream issue:

  https://github.com/ClangBuiltLinux/linux/issues/2162

> -------- Forwarded Message --------
> Subject: 7.0.3 with clang 22.1.4 and full lto: objtool error
> Date: Mon, 4 May 2026 20:46:50 +0200
> From: Klaus Kusche <klaus.kusche@computerix.info>
> To: linux-kernel@vger.kernel.org, Josh Poimboeuf <jpoimboe@kernel.org>, peterz@infradead.org, Nathan Chancellor <nathan@kernel.org>
> 
> Hello,
> 
> with clang 22.1.4, I get an error in the "LD vmlinux.o" step
> (full lto):
> "objtool: bad .discard.annotate_insn entry: 609 of type 8"
> 
> Same kernel & same config compiles and runs nicely with clang 21.1.8.
> 
> I've attached the kernel config to
> https://bugzilla.kernel.org/show_bug.cgi?id=221460
> 

-- 
Cheers,
Nathan