netdev - RE: [syzbot] WARNING in rtl8152

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Date:   Fri, 14 May 2021 02:58:00 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Alan Stern <stern@...land.harvard.edu>
CC:     syzbot <syzbot+95afd23673f5dd295c57@...kaller.appspotmail.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        nic_swsd <nic_swsd@...ltek.com>
Subject: RE: [syzbot] WARNING in rtl8152_probe

Alan Stern <stern@...land.harvard.edu>
> Sent: Thursday, May 13, 2021 10:26 PM
[...]
> Syzbot doesn't test real devices.  It tests emulations, and the emulated
> devices usually behave very strangely and in very peculiar and
> unexpected ways, so as to trigger bugs in the kernel.  That's why the
> USB devices you see in syzbot logs usually have bizarre descriptors.

Do you mean I have to debug for a device which doesn't exist?
I don't understand why I must consider a fake device
which provide unexpected USB descriptor deliberately?

Best Regards,
Hayes