linux-kernel - Re: [syzbot] [xfs?] [ext4?] kernel BUG in __block_write_begin

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Message-ID: <20230904132649.GA4819@lst.de>
Date:   Mon, 4 Sep 2023 15:26:49 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dave Chinner <david@...morbit.com>
Cc:     syzbot <syzbot+4a08ffdf3667b36650a1@...kaller.appspotmail.com>,
        adilger.kernel@...ger.ca, djwong@...nel.org,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        song@...nel.org, syzkaller-bugs@...glegroups.com, tytso@....edu,
        yukuai3@...wei.com, zhang_shurong@...mail.com,
        linux-block@...r.kernel.org, axboe@...nel.dk, hch@....de
Subject: Re: [syzbot] [xfs?] [ext4?] kernel BUG in __block_write_begin_int

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.