linux-kernel - Re: [PATCH] scsi: sd: call device_del() if device_add

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Date:   Thu, 31 Mar 2022 18:14:27 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Wenchao Hao <haowenchao@...wei.com>,
        syzkaller-bugs@...glegroups.com,
        Dan Carpenter <dan.carpenter@...cle.com>
Cc:     axboe@...nel.dk, jejb@...ux.ibm.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        martin.petersen@...cle.com,
        syzbot+f08c77040fa163a75a46@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com, linfeilong@...wei.com
Subject: Re: [PATCH] scsi: sd: call device_del() if device_add_disk() fails

On gioved? 31 marzo 2022 15:42:10 CEST Dan Carpenter wrote:
> Wenchao Hao, what you're saying makes a lot of sense but it raises a lot
> of questions in turn.
> 
> Fabio, did you test your patch?

Yes, I did, Dan. I tested it the usual way with the "#syz test:" command.
Obviously I have not the hardware to test code on it.

Therefore, the messages that say "Syzbot tested the patch and it didn't
trigger any issue" is all that I can know about the code being good or not.
This is the criterion I've always used before sending patches for Syzbot's
reports.

However, my knowledge of these subsystems and the API that are related to 
this bug were very little, but now I can say that during the last couple of 
days it has improved to the point where I can affirm that Wenchao's patch
seems to me to be the only correct solution.

Thanks for all the help you and the the other developers provided. It was
invaluable for a better understanding of this matter.

Regards,

Fabio M. De Francesco