linux-kernel - Re: RCU stalls and GPFs in ceph/netfs

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Message-ID: <CAKPOu+8q_1rCnQndOj3KAitNY2scPQFuSS-AxeGru02nP9ZO0w@mail.gmail.com>
Date: Mon, 29 Jul 2024 13:36:05 +0200
From: Max Kellermann <max.kellermann@...os.com>
To: David Howells <dhowells@...hat.com>
Cc: Jeff Layton <jlayton@...nel.org>, netfs@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	ceph-devel@...r.kernel.org
Subject: Re: RCU stalls and GPFs in ceph/netfs

On Mon, Jul 29, 2024 at 12:17 PM Max Kellermann
<max.kellermann@...os.com> 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.