Re: [PATCH] mm: thp: unlock i_mmap before releasing split folios

[Lorenzo Stoakes <ljs@kernel.org>]

I hate to have to keep pointing this out to people and maybe you were trying to
limit the mailing list rather to maintainers only buuuut :)

$ scripts/get_maintainer.pl mm/huge_memory.c
Andrew Morton <akpm@linux-foundation.org> (maintainer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
David Hildenbrand <david@kernel.org> (maintainer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
Lorenzo Stoakes <ljs@kernel.org> (maintainer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
Zi Yan <ziy@nvidia.com> (reviewer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
Baolin Wang <baolin.wang@linux.alibaba.com> (reviewer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
"Liam R. Howlett" <liam@infradead.org> (reviewer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
Nico Pache <npache@redhat.com> (reviewer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
Ryan Roberts <ryan.roberts@arm.com> (reviewer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
Dev Jain <dev.jain@arm.com> (reviewer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
Barry Song <baohua@kernel.org> (reviewer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
Lance Yang <lance.yang@linux.dev> (reviewer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
Usama Arif <usama.arif@linux.dev> (reviewer:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
linux-mm@kvack.org (open list:MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE))
linux-kernel@vger.kernel.org (open list)

It definitely helps to cc everybody relevant when it comes to getting review.

On Fri, Jul 10, 2026 at 11:56:00PM +0800, Hao Zhang wrote:
> Memory failure: 0x5a6a7: recovery action for clean LRU page: Recovered
> Injecting memory failure for pfn 0x81bfe at process virtual address 0x200000ffe000
> ==================================================================
> BUG: KASAN: slab-use-after-free in __up_read+0x634/0x790 data/linux/kernel/locking/rwsem.c:1353
> Read of size 8 at addr ffff88800b81c5e8 by task syz.2.11034/45874
>
> ...
>
> <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
>
> This is the crash report, please review.
>

Thanks but do you have any of the other pieces around this to help? Like a
reproducer, .config, the arch you ran it on, etc. etc.?

In general please do ensure you evidence things like this without needing to be
asked for it, we can't just take your word for it and the more you do to make
our lives easier the quicker we can get the review done.

We've had real issues in the past with private syzbot reports where it's turned
out on more than one occasion to not actually be a genuine issue.

So your help at a time where mm review is _totally_ overwhelmed would be much
appreciated :)

Thanks, Lorenzo