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Date:   Mon, 4 Sep 2023 15:26:49 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Dave Chinner <david@fromorbit.com>
Cc:     syzbot <syzbot+4a08ffdf3667b36650a1@syzkaller.appspotmail.com>,
        adilger.kernel@dilger.ca, djwong@kernel.org,
        linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
        song@kernel.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu,
        yukuai3@huawei.com, zhang_shurong@foxmail.com,
        linux-block@vger.kernel.org, axboe@kernel.dk, hch@lst.de
Subject: Re: [syzbot] [xfs?] [ext4?] kernel BUG in __block_write_begin_int
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References: <000000000000e76944060483798d@google.com> <ZPWWZeWliX7RhOAZ@dread.disaster.area>
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On Mon, Sep 04, 2023 at 06:33:41PM +1000, Dave Chinner wrote:
> It appears that 0010:__block_write_begin_int() has iterated beyond
> the iomap that was passed in, triggering the BUG_ON() check in
> iomap_to_bh().

Yes, I'll look into it.