linux-kernel - Re: [GIT PULL] x86/topology changes for v5.3

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Date:   Wed, 10 Jul 2019 01:00:32 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     Ingo Molnar <mingo@...nel.org>, Kees Cook <keescook@...omium.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>, Len Brown <lenb@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Tony Luck <tony.luck@...el.com>, Jiri Kosina <jkosina@...e.cz>,
        Bob Moore <robert.moore@...el.com>,
        Erik Schmauss <erik.schmauss@...el.com>
Subject: Re: [GIT PULL] x86/topology changes for v5.3

On Wed, 10 Jul 2019, Thomas Gleixner wrote:
> On Tue, 9 Jul 2019, Linus Torvalds wrote:
> > I also don't have any logs, because the boot never gets far enough. I
> > assume that there was a problem bringing up a non-boot CPU, and the
> > eventual hang ends up being due to that.
> 
> Hrm. I just build the tip of your tree and bootet it. It hangs at:
> 
> [    4.788678] ACPI: 4 ACPI AML tables successfully acquired and loaded
> [    4.793860] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
> [    4.821476] ACPI: Dynamic OEM Table Load:
> 
> That's way after the secondary CPUs have been brought up. tip/master boots
> without problems with the same config. Let me try x86/asm alone and also a
> revert of the CR4/CR0 stuff.

x86/asm works alone

revert of cr4/0 pinning on top of your tree gets stuck as well

> And while writing this the softlockup detector muttered:

Have not yet fully bisected it, but Jiri did and he ended up with

  c522ad0637ca ("ACPICA: Update table load object initialization")

Reverting that on top of your tree makes it work again. Tony has the same
issue.

That still does not explain the cr4/0 issue you have. Can you send me your
.config please?

Thanks,

	tglx