Re: "kernel BUG in update_and_free_pages_bulk" in Linux Kernel v6.12-rc4

Yu Zhao
2025-01-15T04:42:50Z

On Tue, Jan 14, 2025 at 8:45 PM Muchun Song <muchun.song@linux.dev> wrote:
>
>
>
> > On Jan 15, 2025, at 10:17, cheung wall <zzqq0103.hey@gmail.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")
and it went into v6.12-rc6.