linux-kernel - Re: [PATCH 2/3] mm: page table check

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Message-ID: <aee858af-f0f7-1da6-5976-cf0057092afa@gmail.com>
Date:   Mon, 29 Nov 2021 10:55:58 +0800
From:   Fusion Future <qydwhotmail@...il.com>
To:     Pasha Tatashin <pasha.tatashin@...een.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        Paul Turner <pjt@...gle.com>, weixugc@...gle.com,
        Greg Thelen <gthelen@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>, Mike Rapoport <rppt@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>, masahiroy@...nel.org,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "maintainer:X86 ARCHITECTURE" <x86@...nel.org>,
        frederic@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [PATCH 2/3] mm: page table check

On 2021/11/29 00:57, Pasha Tatashin wrote:
> This commit by itself would not cause the freeze or BUG_ON(), but the
> next commit which enables it on x86 arch might.

Yes, you are right. At the commit 
"[1e67abff1820489435aad3fcf258708c21c283ef] x86: mm: add x86_64 support 
for page table check" my system starts to experience the freeze.

I can now reproduce the freeze by following the steps below:

1. Open 20 YouTube video pages, and a YouTube Music page.
2. Play music in the background. (The step can be omitted)
3. Run `git clone 
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git ln`

git will never successfully clone the repo because the system will 
freeze during the operation.

I also tried adding `page_table_check=off` to the boot option but still 
experienced the freeze. Perhaps the option is of no use.