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Date: Wed, 9 Dec 2020 20:24:22 +0100
From: Arnd Bergmann <>
To: Sami Tolvanen <>
Cc: Masahiro Yamada <>, Steven Rostedt <>, 
	Will Deacon <>, Josh Poimboeuf <>, 
	Peter Zijlstra <>, Greg Kroah-Hartman <>, 
	"Paul E. McKenney" <>, Kees Cook <>, 
	Nick Desaulniers <>, 
	clang-built-linux <>, 
	Kernel Hardening <>, 
	linux-arch <>, 
	Linux ARM <>, 
	Linux Kbuild mailing list <>, 
	"" <>, linux-pci <>
Subject: Re: [PATCH v8 00/16] Add support for Clang LTO

On Wed, Dec 9, 2020 at 5:09 PM 'Sami Tolvanen' via Clang Built Linux
<> wrote:
> On Tue, Dec 8, 2020 at 1:02 PM Arnd Bergmann <> wrote:
> > On Tue, Dec 8, 2020 at 9:59 PM Arnd Bergmann <> wrote:
> > >
> > > Attaching the config for "ld.lld: error: Never resolved function from
> > >   blockaddress (Producer: 'LLVM12.0.0' Reader: 'LLVM 12.0.0')"
> >
> > And here is a new one: "ld.lld: error: assignment to symbol
> > init_pg_end does not converge"
> Thanks for these. I can reproduce the "Never resolved function from
> blockaddress" issue with full LTO, but I couldn't reproduce this one
> with ToT Clang, and the config doesn't have LTO enabled:
> $ grep LTO 0x2824F594_defconfig
> Is this the correct config file?

It is the right file, and so far this is the only defconfig on which I
see the "does not converge" error, so I don't have any other one.

I suspect this might be an issue in the version of lld that I have here
and unrelated to LTO, and I can confirm that I see the error
with LTO still disabled.

It seems to be completely random. I do see the bug on next-20201203
but not on a later one. I also tried bisecting through linux-next and
arrived at "lib: stackdepot: add support to configure STACK_HASH_SIZE",
which is almost certainly not related, other than just changing a few
symbols around.


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