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Date: Mon, 16 Mar 2026 13:01:57 +0200
From: Mike Rapoport <rppt@kernel.org>
To: Harry Yoo <harry.yoo@oracle.com>
Cc: syzbot <syzbot+e24a2e34fad0efbac047@syzkaller.appspotmail.com>,
	Liam.Howlett@oracle.com, akpm@linux-foundation.org,
	david@kernel.org, jannh@google.com, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, ljs@kernel.org, riel@surriel.com,
	syzkaller-bugs@googlegroups.com, vbabka@kernel.org,
	peterx@redhat.com
Subject: Re: [syzbot] [mm?] WARNING in folio_add_new_anon_rmap
Message-ID: <abfjJYAWOLpsQuq5@kernel.org>
References: <69b703e6.050a0220.248e02.0101.GAE@google.com>
 <abehBY7QakYF9bK4@hyeyoo>
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In-Reply-To: <abehBY7QakYF9bK4@hyeyoo>

Hi Harry,

Thanks for the fix :)

@Andrew, can you please fold it into
"userfaultfd: introduce struct mfill_state"

On Mon, Mar 16, 2026 at 03:19:49PM +0900, Harry Yoo wrote:
> #syz test
> 
> diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
> index 510c6dcb9824..73adf9ffcac2 100644
> --- a/mm/userfaultfd.c
> +++ b/mm/userfaultfd.c
> @@ -880,7 +880,7 @@ static __always_inline ssize_t mfill_atomic(struct userfaultfd_ctx *ctx,
>  		.dst_start = dst_start,
>  		.src_start = src_start,
>  		.flags = flags,
> -
> +		.len = len,
>  		.src_addr = src_start,
>  		.dst_addr = dst_start,
>  	};
> 

-- 
Sincerely yours,
Mike.