Hi,
sorry if this is not the correct mail list.
I am not sure if this is a bug, if someone can help me ?
I got a Creative Webcam Pro PD1030.
Drivers are loaded :

# dmesg |grep ov511

drivers/media/video/ov511.c: USB OV511+ video device found

drivers/media/video/ov511.c: model: Creative Labs WebCam 3

drivers/media/video/ov511.c: Sensor is an OV7620AE

drivers/media/video/ov511.c: Enabling 511+/7620AE workaround

drivers/media/video/ov511.c: Device at usb-0000:00:02.0-2 registered to

minor 0

usbcore: registered new interface driver ov511

drivers/media/video/ov511.c: v1.64 for Linux 2.5 : ov511 USB Camera Driver
lsmod gives :

ov511                  77072  0

squashfs               46856  0

compat_ioctl32          1408  1 ov511

videodev               27904  1 ov511

v4l2_common            16896  1 videodev

v4l1_compat            14596  1 videodev

usbcore               127128  6 usb_storage,usblp,ov511,ehci_hcd,ohci_hcd
# uname -a

Linux puppypc 2.6.21.7 #1 Sun Feb 24 10:22:08 GMT-8 2008 i686 GNU/Linux
I try for testing

cat /dev/video > video.avi
I got : 
cat: /dev/video*** glibc detected *** cat: free(): invalid next size

(fast): 0x08050ab8 ***

======= Backtrace: =========

/lib/libc.so.6[0xb7f4140e]

/lib/libc.so.6(cfree+0xa9)[0xb7f42bdd]

/lib/libc.so.6[0xb7f1088c]

/lib/libc.so.6[0xb7f0f0ef]

/lib/libc.so.6[0xb7f0edcf]

/lib/libc.so.6(dcgettext+0x24)[0xb7f0e030]

/lib/libc.so.6(__strerror_r+0xc9)[0xb7f46b19]

/lib/libc.so.6[0xb7f89d37]

/lib/libc.so.6(error+0x89)[0xb7f89f38]

cat[0x8049321]

/lib/libc.so.6(__libc_start_main+0x12e)[0xb7f0420e]

cat[0x8048c5d]

======= Memory map: ========

08048000-0804c000 r-xp 00000000 16:05 304622     /bin/cat

0804c000-0804d000 rw-p 00003000 16:05 304622     /bin/cat

0804d000-0806e000 rw-p 0804d000 00:00 0          [heap]

b7d00000-b7d21000 rw-p b7d00000 00:00 0

b7d21000-b7e00000 ---p b7d21000 00:00 0

b7ea1000-b7eaa000 r-xp 00000000 16:05 502230     /usr/lib/libgcc_s.so.1

b7eaa000-b7eab000 rw-p 00008000 16:05 502230     /u...
[ message continues ]

On Fri, 11 Apr 2008 00:35:15 +0200 (CEST)
It seems that the userspace app is trying to free a memory block twice. Only

the author of the application can help to fix this.
This may eventually be caused by some driver bad behavior or OOPS. Do you have

any oops message, if you run "dmesg" ?
About skype, their V4L support is still broken, at least on the versions I

tested here. I have several webcams here. On my tests, it worked only with one

specific model. I suspect that they support only a very few subset of the

supported video formats.
Cheers,

Mauro

--

I forgot to cc the linux mailing list, so here it is again.
hi Mauro,
thanks for your answer !
I already contacted the authors (Mark,Wallac,Olawlor), but no feedback

yet.
I got no oops message from kernel.

Can you help me and show me how to debug it or give some ideas ?
Cheers, linuxcbon
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> I forgot to cc the linux mailing list, so here it is again.
So, this doesn't seem to be a driver issue. I suspect that your userspace app

is trying to configure an unsupported configuration. This driver still

implements the legacy V4L1 API. Maybe converting it to V4L2 would solve your

issues. Another option is to check if gspca driver works with this device.
Cheers,

Mauro

--

Hi,
lsmod gives :

ov511                  77072  0

compat_ioctl32          1408  1 ov511

videodev               27904  1 ov511

v4l2_common            16896  1 videodev

v4l1_compat            14596  1 videodev
This device works with OV511+

(see http://alpha.dyndns.org/ov511/cameras.html).

Difference between OV511 and OV511+ ?
cheers, linuxcbon
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