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Date:   Tue, 30 Apr 2019 17:35:16 +0200
From:   Greg KH <greg@kroah.com>
To:     syzbot <syzbot+170a86bf206dd2c6217e@syzkaller.appspotmail.com>
Cc:     andreyknvl@google.com, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: WARNING: Detected a wedged cx25840 chip; the device will not
 work.
Message-ID: <20190430153516.GA23459@kroah.com>
References: <00000000000048aa750587c052ef@google.com>
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On Tue, Apr 30, 2019 at 07:36:07AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    9a33b369 usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=12df67c3200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
> dashboard link: https://syzkaller.appspot.com/bug?extid=170a86bf206dd2c6217e
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=108a28f3200000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=145d8a2d200000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+170a86bf206dd2c6217e@syzkaller.appspotmail.com
> 
> usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> pvrusb2: Hardware description: Gotview USB 2.0 DVD 2
> pvrusb2: Invalid write control endpoint
> usb 1-1: USB disconnect, device number 2
> pvrusb2: Invalid write control endpoint
> pvrusb2: WARNING: Detected a wedged cx25840 chip; the device will not work.
> pvrusb2: WARNING: Try power cycling the pvrusb2 device.
> pvrusb2: WARNING: Disabling further access to the device to prevent other
> foul-ups.
> pvrusb2: Device being rendered inoperable
> cx25840 0-0044: Unable to detect h/w, assuming cx23887
> cx25840 0-0044: cx23887 A/V decoder found @ 0x88 (pvrusb2_a)
> pvrusb2: Attached sub-driver cx25840
> pvrusb2: Attempted to execute control transfer when device not ok
> pvrusb2: Attempted to execute control transfer when device not ok

As the driver said, power cycle your device, it crashed :)

Seriously, I think your script detection failed here, sorry.

greg k-h