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

[Nathan Chancellor <nathan@kernel.org>]

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