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From: Pasha Tatashin <pasha.tatashin@soleen.com>
To: Fusion Future <qydwhotmail@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Paul Turner <pjt@google.com>,
	weixugc@google.com, Greg Thelen <gthelen@google.com>,
	Ingo Molnar <mingo@redhat.com>, Jonathan Corbet <corbet@lwn.net>,
	Will Deacon <will@kernel.org>, Mike Rapoport <rppt@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	masahiroy@kernel.org, Sami Tolvanen <samitolvanen@google.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"maintainer:X86 ARCHITECTURE" <x86@kernel.org>,
	frederic@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: Re: [PATCH 2/3] mm: page table check
Date: Tue, 30 Nov 2021 14:25:09 -0500	[thread overview]
Message-ID: <CA+CK2bBQE0-Tw0XhAyPm0R3hsCkUqN7Oij4vNEDfut80KBxGZA@mail.gmail.com> (raw)
In-Reply-To: <aee858af-f0f7-1da6-5976-cf0057092afa@gmail.com>

On Sun, Nov 28, 2021 at 9:57 PM Fusion Future <qydwhotmail@gmail.com> wrote:
>
> 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`

Thanks, I found a reliable way to reproduce this problem on my workstation:
reduce the amount of physical memory to 4G via memmap kernel
parameter,  and use a script that starts chrome browser with 20 tabs
each pointing to a youtube.com page.

I will send an update after root cause.

> 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

I will add support for page_table_check=off even when
CONFIG_PAGE_TABLE_CHECK_ENFORCED is set

Thanks,
Pasha

  reply	other threads:[~2021-11-30 19:26 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-23 21:48 [PATCH 0/3] page table check Pasha Tatashin
2021-11-23 21:48 ` [PATCH 1/3] mm: ptep_clear() page table helper Pasha Tatashin
2021-11-23 21:48 ` [PATCH 2/3] mm: page table check Pasha Tatashin
2021-11-27  8:10   ` Fusion Future
2021-11-27  8:14   ` Fushan Wen
2021-11-27  8:41   ` Fusion Future
2021-11-27 19:48     ` Pasha Tatashin
2021-11-28  8:13       ` Fusion Future
2021-11-28  9:37       ` Fusion
2021-11-28 16:54         ` Fusion Future
2021-11-28 16:57           ` Pasha Tatashin
2021-11-29  2:55             ` Fusion Future
2021-11-30 19:25               ` Pasha Tatashin [this message]
2021-12-01  8:38   ` Jiri Slaby
2021-11-23 21:48 ` [PATCH 3/3] x86: mm: add x86_64 support for " Pasha Tatashin
2021-12-01  8:00   ` Jiri Slaby
2021-12-01  8:44     ` Jiri Slaby
2021-12-01 13:55       ` Pasha Tatashin
2021-12-02  9:59         ` Jiri Slaby
2021-12-02 10:05           ` Jiri Slaby
2021-12-02 10:30             ` Muchun Song
2021-12-02 15:01             ` Pasha Tatashin

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