Re: BUG: unable to handle kernel NULL pointer dereference in bio_associate_blkg_from_css

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To: Wei Chen <harperchen1110@xxxxxxxxx>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in bio_associate_blkg_from_css
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Sun, 30 Oct 2022 02:57:10 -0700
Cc: tj@xxxxxxxxxx, axboe@xxxxxxxxx, cgroups@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <CAO4mrfdCeFWo4Nq=OYyiOa2qhuu3Jkft3KSosympvrFzxt+iQg@mail.gmail.com>
References: <CAO4mrfdCeFWo4Nq=OYyiOa2qhuu3Jkft3KSosympvrFzxt+iQg@mail.gmail.com>

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.

References:
- BUG: unable to handle kernel NULL pointer dereference in bio_associate_blkg_from_css
  - From: Wei Chen

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