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Subject: Re: "kernel BUG in update_and_free_pages_bulk" in Linux Kernel
 v6.12-rc4
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From: Muchun Song <muchun.song@linux.dev>
In-Reply-To: <CAOUHufbv9fEALO4Dhdhshu8e+920AxCOhCyuj1j7AGdxuGL-pQ@mail.gmail.com>
Date: Wed, 15 Jan 2025 17:09:46 +0800
Cc: cheung wall <zzqq0103.hey@gmail.com>,
 Andrew Morton <akpm@linux-foundation.org>,
 linux-mm@kvack.org,
 linux-kernel@vger.kernel.org
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Message-Id: <024E619D-033C-4482-89D2-B997950A9463@linux.dev>
References: <CAKHoSAvRgb5FW1zqNLJ1CmFsfTpA-b4=pcqMUNWSDT4Z3=UNTQ@mail.gmail.com>
 <BA95096F-CBD5-417D-9EC1-31C56405EDA9@linux.dev>
 <CAOUHufbv9fEALO4Dhdhshu8e+920AxCOhCyuj1j7AGdxuGL-pQ@mail.gmail.com>
To: Yu Zhao <yuzhao@google.com>
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> On Jan 15, 2025, at 12:42, Yu Zhao <yuzhao@google.com> wrote:
>=20
> On Tue, Jan 14, 2025 at 8:45=E2=80=AFPM Muchun Song =
<muchun.song@linux.dev> wrote:
>>=20
>>=20
>>=20
>>> On Jan 15, 2025, at 10:17, cheung wall <zzqq0103.hey@gmail.com> =
wrote:
>>>=20
>>> Hello,
>>>=20
>>> I am writing to report a potential vulnerability identified in the
>>> Linux Kernel version v6.12-rc4. This vulnerability was discovered
>>> while i was testing the kernel.
>>=20
>> Thanks for your report. I'll fix it later.
>>=20
>> Thanks,
>> Muchun
>>=20
>>>=20
>>> Linux Kernel Repository Git Commit:
>>> 42f7652d3eb527d03665b09edac47f85fb600924 (tag: v6.12-rc4)
>>>=20
>>> Bug Location: update_and_free_pages_bulk+0x657/0x810 =
mm/hugetlb.c:1860
>>>=20
>>> Bug report: https://pastebin.com/q8J3z5Gq
>>>=20
>>> Entire Log: https://pastebin.com/AQF101kq
>>>=20
>>> Thank you for your time and attention.
>>>=20
>>> Best regards
>>>=20
>>> Wall
>=20
> This was fixed by
>  commit 9d08ec41a064 ("mm: allow set/clear page_type again")

Thanks for your reminder. It's really helpful.

Thanks,
Muchun

> and it went into v6.12-rc6.