linux-kernel - Re: 4.17.0-rc1 doesn't boot.

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Message-ID: <db545641-9fb4-6ef1-32f4-2afc987261b0@intel.com>
Date:   Tue, 17 Apr 2018 12:56:21 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Mike Galbraith <efault@....de>, Borislav Petkov <bp@...en8.de>,
        Jörg Otte <jrg.otte@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Aaro Koskinen <aaro.koskinen@...ia.com>
Subject: Re: 4.17.0-rc1 doesn't boot.

Heh, your .config is insidious:

ffffffff9ffe3000 B __brk_base
ffffffff9ffe3000 B __bss_stop
ffffffff9fff3000 b .brk.dmi_alloc
ffffffffa0003000 b .brk.early_pgt_alloc
ffffffffa000f000 B _end
ffffffffa000f000 B __brk_limit

dmi_alloc is __init, so it gets freed at some point and the PTEs zeroed
out.  That causes the warning when change_page_attr() sees the zero'd
PTE.  We just need to special-case the __init section along with the
linear map in pageattr.c.

I'll have some patches to do this shortly.