linux-kernel - Re: [EXTERNAL] Re: [PATCH v2 0/4] Enable measuring the kernel's Source-based Code Coverage and MC/DC with Clang

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Message-ID: <5F5EA6BE-94BD-4352-ADA9-D14BBE703D4F@boeing.com>
Date: Fri, 22 Nov 2024 19:28:46 +0000
From: "Wolber (US), Chuck" <chuck.wolber@...ing.com>
To: Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor
	<nathan@...nel.org>
CC: Wentao Zhang <wentaoz5@...inois.edu>,
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Subject: Re: [EXTERNAL] Re: [PATCH v2 0/4] Enable measuring the kernel's
 Source-based Code Coverage and MC/DC with Clang

> > On Thu, Oct 03, 2024 at 04:29:38PM -0700, Nathan Chancellor wrote:
> >
> > $ /usr/bin/time -v make -skj"$(nproc)" ARCH=x86_64 LLVM=1 mrproper {def,amd_mem_encrypt.,fortify_source.,llvm_cov.}config bzImage
> > ...
> > vmlinux.o: warning: objtool: __sev_es_nmi_complete+0x6e: call to kasan_check_write() leaves .noinstr.text section

%< SNIP %<

> > vmlinux.o: warning: objtool: acpi_idle_do_entry+0x4: call to perf_lopwr_cb() leaves .noinstr.text section
>
>
> Just saw this fly by, that looks like something is buggered bad. Notably
> lockdep_hardirqs_{on,off}() are noinstr.
>
>
> Is this patch-set causing this, or what?

No, these patches are not causing this. This patch-set appears to have exposed a
bug in the llvm linker (lld):

https://github.com/llvm/llvm-project/issues/116575

..Ch:W..