linux-kernel - Re: [syzbot] general protection fault in blk_mq_run_hw

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Date:   Mon, 5 Jul 2021 12:24:55 +0200
From:   Christoph Hellwig <hch@....de>
To:     Guoqing Jiang <jiangguoqing@...inos.cn>
Cc:     syzbot <syzbot+9ca43ff47167c0ee3466@...kaller.appspotmail.com>,
        axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        hch@....de
Subject: Re: [syzbot] general protection fault in blk_mq_run_hw_queues

On Mon, Jul 05, 2021 at 02:00:17PM +0800, Guoqing Jiang wrote:
> diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
> index 614d82e7fae4..d2548d36bf21 100644
> --- a/drivers/block/nbd.c
> +++ b/drivers/block/nbd.c
> @@ -222,8 +222,8 @@ static void nbd_dev_remove(struct nbd_device *nbd)
>
>         if (disk) {
>                 del_gendisk(disk);
> -               blk_mq_free_tag_set(&nbd->tag_set);
>                 blk_cleanup_disk(disk);
> +               blk_mq_free_tag_set(&nbd->tag_set);
>         }
>
> Also paride/pd.c needs the same change, is my understanding correct? 
> Christoph.

Yes.  Do you have a patch or should I send one?