linux-kernel - Re: [PATCH] jfs: fix shift-out-of-bounds in dbJoin

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Date: Mon, 29 Jan 2024 09:00:56 -0600
From: Dave Kleikamp <dave.kleikamp@...cle.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Manas Ghandat <ghandatmanas@...il.com>,
        Linux-kernel-mentees@...ts.linuxfoundation.org,
        jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        syzbot+411debe54d318eaed386@...kaller.appspotmail.com,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH] jfs: fix shift-out-of-bounds in dbJoin

On 1/29/24 8:55AM, Matthew Wilcox wrote:
> On Mon, Jan 29, 2024 at 08:39:18AM -0600, Dave Kleikamp wrote:
>> On 1/28/24 2:49PM, Matthew Wilcox wrote:
>>> On Wed, Oct 11, 2023 at 08:09:37PM +0530, Manas Ghandat wrote:
>>>> Currently while joining the leaf in a buddy system there is shift out
>>>> of bound error in calculation of BUDSIZE. Added the required check
>>>> to the BUDSIZE and fixed the documentation as well.
>>>
>>> This patch causes xfstests to fail frequently.  The one this trace is
>>> from was generic/074.
>>
>> Thanks for catching this. The sanity test is not right, so we need to revert
>> that one.
> 
> Unfortunately, my overnight test run with this patch reverted crashed
> again with the same signature.  I also reverted the parent commit,
> and when that crashed I also reverted the parent of that.  Which also
> crashed.
> 
> So maybe there's something else that makes this unstable.  Or maybe my
> bisect went wrong.  Or _something_.  Anyway, I'm going to spend much of
> today hammering on generic/074 with various kernel versions and see what
> I can deduce.
> 
> So far I see no evidence that v6.7 crashes with g/074.  And I know that
> next-20240125 does crash with g/074.  I'm pretty sure that v6.8-rc1 also
> crashes with g/074, but will confirm that.

I'll try to beat on it too and see what I find.

Sasha, maybe hold up on to all the jfs patches for the time being.

Thanks,
Shaggy