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Date:   Mon, 21 Nov 2022 16:40:48 +0100
From:   Jan Kara <>
To:     Thorsten Leemhuis <>
Cc:     Jan Kara <>,
        Jeremi Piotrowski <>,
        Thilo Fromm <>,
        Ye Bin <>,,,,
Subject: Re: [syzbot] possible deadlock in jbd2_journal_lock_updates

On Mon 21-11-22 16:18:09, Thorsten Leemhuis wrote:
> On 21.11.22 16:00, Jan Kara wrote:
> > OK, attached patch fixes the deadlock for me. Can you test whether it fixes
> > the problem for you as well? Thanks!
> Jan, many thx for taking care of this. There is one small thing to
> improve, please add the following tags to your patch:
> Link:
Good point. Thanks, added!

> Not sure, maybe a reported-by for Syzbot would be good as well, see:

The syzbot report is actually unrelated. So far I think that the bisection
that landed guys on the same commit as syzbot was just luck or maybe change
in timing that made the problem easier to reproduce. 

Jan Kara <>

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