linux-kernel - Re: "kernel BUG in update_and_free_pages

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Message-Id: <024E619D-033C-4482-89D2-B997950A9463@linux.dev>
Date: Wed, 15 Jan 2025 17:09:46 +0800
From: Muchun Song <muchun.song@...ux.dev>
To: Yu Zhao <yuzhao@...gle.com>
Cc: cheung wall <zzqq0103.hey@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 linux-mm@...ck.org,
 linux-kernel@...r.kernel.org
Subject: Re: "kernel BUG in update_and_free_pages_bulk" in Linux Kernel
 v6.12-rc4



> On Jan 15, 2025, at 12:42, Yu Zhao <yuzhao@...gle.com> wrote:
> 
> On Tue, Jan 14, 2025 at 8:45 PM Muchun Song <muchun.song@...ux.dev> wrote:
>> 
>> 
>> 
>>> On Jan 15, 2025, at 10:17, cheung wall <zzqq0103.hey@...il.com> wrote:
>>> 
>>> Hello,
>>> 
>>> 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.
>> 
>> Thanks for your report. I'll fix it later.
>> 
>> Thanks,
>> Muchun
>> 
>>> 
>>> Linux Kernel Repository Git Commit:
>>> 42f7652d3eb527d03665b09edac47f85fb600924 (tag: v6.12-rc4)
>>> 
>>> Bug Location: update_and_free_pages_bulk+0x657/0x810 mm/hugetlb.c:1860
>>> 
>>> Bug report: https://pastebin.com/q8J3z5Gq
>>> 
>>> Entire Log: https://pastebin.com/AQF101kq
>>> 
>>> Thank you for your time and attention.
>>> 
>>> Best regards
>>> 
>>> Wall
> 
> 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.