linux-kernel - Re: PROBLEM: SLAB use-after-free with ceph(fs)

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Message-ID: <YdQ7msXTCF5kKl4V@softhammer.credativ.lan>
Date:   Tue, 4 Jan 2022 13:20:42 +0100
From:   Bastian Blank <bastian.blank@...dativ.de>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Ilya Dryomov <idryomov@...il.com>, ceph-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: SLAB use-after-free with ceph(fs)

Hi

On Tue, Jan 04, 2022 at 07:00:31AM -0500, Jeff Layton wrote:
> On Tue, 2022-01-04 at 10:49 +0100, Bastian Blank wrote:
> > > [152791.777458] cache_from_obj: Wrong slab cache. jbd2_journal_handle but object is from kmalloc-256

> At first blush, this looks like the same problem as:
>     https://tracker.ceph.com/issues/52283
> ...but that should have been fixed in v5.14.

Nope, does not make sense.  This reported issue tried to free a
"ceph_cap_flush", while mine tries to free "jbd2_journal_handle", which
is far away.

> You may also want to try v5.16-rc8 if you're able to build your own
> kernels. There were some patches that went in to improve how the client
> handles inodes that become inaccessible.

I try to get them to install a 5.16-rc8 or newer, get a new crash dump
and report that to https://tracker.ceph.com/.

Thanks,
Bastian

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Bastian Blank
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