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Date:   Sun, 30 Oct 2022 02:57:10 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Wei Chen <harperchen1110@gmail.com>
Cc:     tj@kernel.org, axboe@kernel.dk, cgroups@vger.kernel.org,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in
 bio_associate_blkg_from_css
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On Sun, Oct 30, 2022 at 05:39:59PM +0800, Wei Chen wrote:
> Dear Linux Developer,
> 
> Recently when using our tool to fuzz kernel, the following crash was triggered:

This looks like jfs somehow not setting log->bdev before doing I/O.