linux-kernel - Re: [RFC PATCH 1/1] x86/mm/pat: Clear VM_PAT if copy_p4d

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Message-ID: <248aff47-f049-4f4f-a6ac-cf01c5d2ac61@huawei.com>
Date:   Fri, 24 Feb 2023 09:15:45 +0800
From:   mawupeng <mawupeng1@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <mawupeng1@...wei.com>, <dave.hansen@...ux.intel.com>,
        <luto@...nel.org>, <peterz@...radead.org>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <bp@...e.de>,
        <toshi.kani@...com>, <suresh.b.siddha@...el.com>,
        <syzbot+5f488e922d047d8f00cc@...kaller.appspotmail.com>
Subject: Re: [RFC PATCH 1/1] x86/mm/pat: Clear VM_PAT if copy_p4d_range failed



On 2023/2/24 6:14, Andrew Morton wrote:
> On Fri, 17 Feb 2023 10:56:15 +0800 Wupeng Ma <mawupeng1@...wei.com> wrote:
> 
>> From: Ma Wupeng <mawupeng1@...wei.com>
>>
>> x86/mm/pat: Clear VM_PAT if copy_p4d_range failed.
>>
>> Syzbot reports
> 
> Thanks.  It would be nice to have a Link: to this report - I cannot
> find that email anywhere :(

This WARN_ON_ONCE was originally reported by syz since v4.19[1] and we found that
this problem can be reproduced in v5.10 and the latest master.

[1]: https://syzkaller.appspot.com/bug?id=2ab293a84ed98e600f31dede8e082dc81be8a4fe

> 
>