linux-kernel - Re: video: USB webcam fails since kernel 3.2

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Message-ID: <CAPZXPQegp7RA5M0H9Ofq4rJ9aj-rEdg=Ly9_1c6vAKi3COw50g@mail.gmail.com>
Date:	Sun, 8 Jul 2012 16:01:53 +0300
From:	Martin-Éric Racine <martin-eric.racine@....fi>
To:	Jean-François Moine <moinejf@...e.fr>
Cc:	677533@...s.debian.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: video: USB webcam fails since kernel 3.2

2012/6/17 Martin-Éric Racine <martin-eric.racine@....fi>:
> pe, 2012-06-15 kello 23:41 -0500, Jonathan Nieder kirjoitti:
>> Martin-Ã‰ric Racine wrote:
>> > usb 1-7: new high-speed USB device number 3 using ehci_hcd
>> [...]
>> > usb 1-7: New USB device found, idVendor=0ac8, idProduct=0321
>> > usb 1-7: New USB device strings: Mfr=1, Product=2, SerialNumber=0
>> > usb 1-7: Product: USB2.0 Web Camera
>> > usb 1-7: Manufacturer: Vimicro Corp.
>> [...]
>> > Linux media interface: v0.10
>> > Linux video capture interface: v2.00
>> > gspca_main: v2.14.0 registered
>> > gspca_main: vc032x-2.14.0 probing 0ac8:0321
>> > usbcore: registered new interface driver vc032x
>>
>> The device of interest is discovered.
>>
>> > gspca_main: ISOC data error: [36] len=0, status=-71
>> > gspca_main: ISOC data error: [65] len=0, status=-71
>> [...]
>> > gspca_main: ISOC data error: [48] len=0, status=-71
>> > video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error 14 in cheese[8048000+21000]
>> > gspca_main: ISOC data error: [17] len=0, status=-71
>>
>> (The above data error spew starts around t=121 seconds and continues
>> at a rate of about 15 messages per second.  The segfault is around
>> t=154.)
>
>> The vc032x code hasn't changed since 3.4.1, so please report your
>> symptoms to Jean-FranÃ§ois Moine <moinejf@...e.fr>, cc-ing
>> linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, and either
>> me or this bug log so we can track it.  Be sure to mention:
>>
>>  - steps to reproduce, expected result, actual result, and how the
>>    difference indicates a bug (should be simple enough in this case)
>
> 1. Ensure that user 'myself' is a member of the 'video' group.
> 2. Launch the webcam application Cheese from the GNOME desktop.
>
> Expected result: Cheese displays whatever this laptop's camera sees.
>
> Actual result: Cheese crashes while attempting to access the camera.
>
>>  - how reproducible the bug is (100%?)
>
> 100%
>
>>  - which kernel versions you have tested and result with each (what is
>>    the newest kernel version that worked?)
>
> It probably was 3.1.0 or some earlier 3.2 release (the upcoming Debian
> will release with 3.2.x; 3.4 was only used here for testing purposes),
> but I wouldn't know for sure since I don't use my webcam too often.

I finally found time to perform further testing, using kernel packages
from snapshots.debian.org, and the last one that positively worked (at
least using GNOME's webcam application Cheese) was:

linux-image-3.1.0-1-686-pae          3.1.8-2
 Linux 3.1 for modern PCs

This loaded the following video modules:

gspca_vc032x
gspca_main
videodev
media

Tests using 3.2.1-1 or more recent crashed as described before. This
at least gives us a time frame for when the regression started.

Martin-Éric
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