linux-kernel - Re: [PATCH v3] arm64/mm: avoid fixmap race condition when create pud mapping

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Message-ID: <YdcRLohx777jzWah@arm.com>
Date:   Thu, 6 Jan 2022 15:56:30 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Jianyong Wu <Jianyong.Wu@....com>
Cc:     "will@...nel.org" <will@...nel.org>,
        Anshuman Khandual <Anshuman.Khandual@....com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "david@...hat.com" <david@...hat.com>,
        "quic_qiancai@...cinc.com" <quic_qiancai@...cinc.com>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "gshan@...hat.com" <gshan@...hat.com>,
        Justin He <Justin.He@....com>, nd <nd@....com>
Subject: Re: [PATCH v3] arm64/mm: avoid fixmap race condition when create pud
 mapping

On Thu, Jan 06, 2022 at 10:13:06AM +0000, Jianyong Wu wrote:
> I test this patch in your way using both EDK2 V2.6 and EDK2 v2.7. it's
> peculiar that this issue shows up on v2.6 but not on v2.7.
> For now, I only find that if "CONFIG_DEBUG_LOCK_ALLOC" is enabled, the
> kernel boot will hang. However, I can't debug it by printk as this
> issue happens before pl11 is ready.

I tried earlycon but that doesn't help either.

> I will go on debugging, but very appreciated if someone can give some
> hints on it.

FWIW, passing "nokaslr" on the kernel command line makes it boot (and
this makes debugging harder). That's as far as I've gone.

-- 
Catalin