linux-kernel - Re: [PATCH] netfs, ceph: Revert "netfs: Remove deprecated use of PG_private

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Message-ID: <3717298.1722422465@warthog.procyon.org.uk>
Date: Wed, 31 Jul 2024 11:41:05 +0100
From: David Howells <dhowells@...hat.com>
To: Max Kellermann <max.kellermann@...os.com>
Cc: dhowells@...hat.com, Ilya Dryomov <idryomov@...il.com>,
    Xiubo Li <xiubli@...hat.com>, Jeff Layton <jlayton@...nel.org>,
    willy@...radead.org, ceph-devel@...r.kernel.org,
    netfs@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
    linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] netfs, ceph: Revert "netfs: Remove deprecated use of PG_private_2 as a second writeback flag"

Max Kellermann <max.kellermann@...os.com> wrote:

> It was not caused by my bad patch. Without my patch, but with your
> revert instead I just got a crash (this time, I enabled lots of
> debugging options in the kernel, including KASAN) - it's the same
> crash as in the post I linked in my previous email:
> 
>  ------------[ cut here ]------------
>  WARNING: CPU: 13 PID: 3621 at fs/ceph/caps.c:3386
> ceph_put_wrbuffer_cap_refs+0x416/0x500

Is that "WARN_ON_ONCE(ci->i_auth_cap);" for you?

David