linux-kernel - Re: [PATCH] arch/x86/kernel/cpu/microcode/intel: don't store initrd's start

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Message-ID: <20160725070648.GB24576@nazgul.tnic>
Date:	Mon, 25 Jul 2016 09:06:48 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Nicolai Stange <nicstange@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arch/x86/kernel/cpu/microcode/intel: don't store
 initrd's start

On Sun, Jul 24, 2016 at 05:05:49PM +0200, Nicolai Stange wrote:
> On x86_64 with CONFIG_RANDOMIZE_MEMORY and CONFIG_MICROCODE_INTEL,
> I get the following splat upon booting on an Intel i7-4800MQ:

Before we dive into this, let's establish which tree you're exactly
testing...

> 
>   Call Trace:
>    [<ffffffffb6054cea>] ? find_microcode_patch+0x4a/0xa0
>    [<ffffffffb6055487>] load_microcode.isra.1.constprop.12+0x37/0xa0
>    [...]
>    [<ffffffffb60557cd>] load_ucode_intel_ap+0x5d/0x80
>    [<ffffffffb6054924>] load_ucode_ap+0x94/0xa0
>    [<ffffffffb60481a8>] cpu_init+0x58/0x3e0
>    [<ffffffffb60709bc>] ? set_pte_vaddr+0x5c/0x90
>    [<ffffffffb6fac06c>] trap_init+0x2b6/0x328
>    [<ffffffffb6fa0dba>] start_kernel+0x224/0x47f
>    [<ffffffffb6fa0120>] ? early_idt_handler_array+0x120/0x120
>    [<ffffffffb6fa02cf>] x86_64_start_reservations+0x29/0x2b
>    [<ffffffffb6fa041e>] x86_64_start_kernel+0x14d/0x170
>   [...]
>   RIP  [<ffffffffb6055af5>] has_newer_microcode+0x5/0x20
>    [...]
>   ---[ end trace b163fd3960fd46fb ]---
>   Kernel panic - not syncing: Attempted to kill the idle task!
>   ---[ end Kernel panic - not syncing: Attempted to kill the idle task!
> 
> It can be bisected to commit 21ef9a5c3164 ("Merge branch 'x86/microcode'").

This commit 21ef9a5c3164 does not exist - the current merge commit
corresponding to this is

commit 2a2a745e2d248498a21ba3876d2481e90c7fe0a5
Merge: caaaa222620c eb06158ee145
Author: Ingo Molnar <mingo@...nel.org>
Date:   Sun Jul 24 08:26:41 2016 +0200

    Merge branch 'x86/microcode'

> Both of its parents, i.e.
>   commit f5846c92b0a5 ("Merge branch 'x86/headers'")

This commit does not exist either.

> and
>   commit eb06158ee145 ("x86/microcode: Remove unused symbol exports")

This one does.

> work fine by themselves.
> "Cross-bisecting" between v4.7-rc6..f5846c92b0a5 and v4.7-rc6..eb06158ee145
> reveals the conflicting commits:
>   commit 021182e52fe0 ("x86/mm: Enable KASLR for physical mapping memory
>                         regions")
> and
>   commit 6c5456474e7f ("x86/microcode: Fix loading precedence").

Those two too.

So it seems you're either testing an older tip/master or some linux-next.

So let's clarify what exactly you're testing before we do anything else.

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--