Re: [syzbot] [mm?] WARNING in folio_add_new_anon_rmap

[Mike Rapoport]

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.