linux-ext4 - Re: [syzbot] possible deadlock in jbd2_journal_lock

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Date:   Fri, 21 Oct 2022 12:23:41 +0200
From:   Thilo Fromm <t-lo@...ux.microsoft.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Ye Bin <yebin10@...wei.com>, jack@...e.com, tytso@....edu,
        linux-ext4@...r.kernel.org, regressions@...ts.linux.dev,
        Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
Subject: Re: [syzbot] possible deadlock in jbd2_journal_lock_updates

Hello Honza,

>> Just want to make sure this does not get lost - as mentioned earlier,
>> reverting 51ae846cff5 leads to a kernel build that does not have this issue.
> 
> Yes, I'm aware of this and still cannot quite wrap my head how it could be
> given the stacktraces I see :) They do not seem to come anywhere near that
> code...

Just reaching out to let folks know that we see more reports on this 
issue coming in for kernels >=5.15.63, see 
https://github.com/flatcar/Flatcar/issues/847#issuecomment-1286523602.

Best regards,
Thilo