On Mon, 31 Jan 2022 20:02:55 -0300 Mauricio Faria de Oliveira <mfo@xxxxxxxxxxxxx> wrote:
> Problem:
> =======
>
> Userspace might read the zero-page instead of actual data from a
> direct IO read on a block device if the buffers have been called
> madvise(MADV_FREE) on earlier (this is discussed below) due to a
> race between page reclaim on MADV_FREE and blkdev direct IO read.
>
> ...
>
> Fixes: 802a3a92ad7a ("mm: reclaim MADV_FREE pages")
Five years ago. As it doesn't seem urgent I targeted 5.18-rc1 for
this, and added a cc:stable so it will trickle back into earlier trees.
How does this plan sound?
