linux-kernel - Re: [syzbot] [nilfs?] general protection fault in nilfs_clear_dirty

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Message-ID: <CAKFNMomCUnaB3_3chQm4P8devx2NwAp2hMpYfbyaHKyO2WLEkw@mail.gmail.com>
Date:   Mon, 12 Jun 2023 12:59:39 +0900
From:   Ryusuke Konishi <konishi.ryusuke@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     syzbot <syzbot+53369d11851d8f26735c@...kaller.appspotmail.com>,
        axboe@...nel.dk, dsterba@...e.com, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nilfs@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        wqu@...e.com
Subject: Re: [syzbot] [nilfs?] general protection fault in nilfs_clear_dirty_page

On Mon, Jun 12, 2023 at 12:30 PM Christoph Hellwig wrote:
>
> On Sun, Jun 11, 2023 at 02:18:29PM -0700, syzbot wrote:
> > syzbot has bisected this issue to:
> >
> > commit 4a445b7b6178d88956192c0202463063f52e8667
> > Author: Qu Wenruo <wqu@...e.com>
> > Date:   Sat Aug 13 08:06:53 2022 +0000
> >
> >     btrfs: don't merge pages into bio if their page offset is not contiguous
>
> I can't see how that btrfs commit would affect nilfs2..

Yeah, I think this bisection result is wrong.
I have already posted a bug-fix patch titled "nilfs2: prevent general
protection fault in nilfs_clear_dirty_page()"
for this issue.

Thanks,
Ryusuke Konishi