linux-kernel - Re: arm64 kvm built with clang doesn't boot

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Date:   Fri, 16 Mar 2018 15:55:16 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Stephen Hines <srhines@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        kvmarm@...ts.cs.columbia.edu, LKML <linux-kernel@...r.kernel.org>,
        kernel-dynamic-tools <kernel-dynamic-tools@...gle.com>
Subject: Re: arm64 kvm built with clang doesn't boot

On Fri, Mar 16, 2018 at 3:31 PM, Mark Rutland <mark.rutland@....com> wrote:
>
> FWIW, with that same compiler and patch applied atop of v4.16-rc4, and
> some bodges around clang not liking the rX register naming in the SMCCC
> code, I get a kernel that boots on my Juno, though I immediately hit a
> KASAN splat:
>
> [    8.476766] ==================================================================
> [    8.483990] BUG: KASAN: slab-out-of-bounds in __d_lookup_rcu+0x350/0x400
> [    8.490664] Read of size 8 at addr ffff8009336e2a30 by task init/1

I see this as well, I'm looking into it. It seems that
__no_sanitize_address is not defined for clang (defining it doesn't
help though, so the issue might be deeper).