linux-kernel - Re: [syzbot] WARNING in rtl8152

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Message-ID: <20210513142552.GA967812@rowland.harvard.edu>
Date:   Thu, 13 May 2021 10:25:52 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Hayes Wang <hayeswang@...ltek.com>
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

On Thu, May 13, 2021 at 03:13:36AM +0000, Hayes Wang wrote:
> syzbot <syzbot+95afd23673f5dd295c57@...kaller.appspotmail.com>
> > Sent: Wednesday, May 12, 2021 5:40 PM
> [...] 
> > usb 1-1: New USB device found, idVendor=045e, idProduct=0927, bcdDevice=89.4f
> > usb 1-1: New USB device strings: Mfr=0, Product=4, SerialNumber=0
> > usb 1-1: Product: syz
> > usb 1-1: config 0 descriptor??
> 
> The bcdDevice is strange. Could you dump your USB descriptor?

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.

Alan Stern