Re: RCU stalls and GPFs in ceph/netfs

[Max Kellermann]

On Mon, Jul 29, 2024 at 12:17 PM Max Kellermann
<max.kellermann@xxxxxxxxx> wrote:
>  BUG: kernel NULL pointer dereference, address: 0000000000000356

This is obviously NETFS_FOLIO_COPY_TO_CACHE; this looks like it was
caused by 2ff1e97587f4 ("netfs: Replace PG_fscache by setting
folio->private and marking dirty"). That commit uses
folio_attach_private(), but fs/ceph already used
folio_attach_private() for something else.