--- Mauro Carvalho Chehab <mchehab@infradead.org> a écrit :

quoted text
> On Fri, 11 Apr 2008 00:35:15 +0200 (CEST)
> linuxcbon <linuxcbon@yahoo.fr> wrote:
> 
> > 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    
> /usr/lib/libgcc_s.so.1
> > b7eab000-b7ede000 r--p 00000000 16:05 498627    
> > /usr/lib/locale/en_US/LC_CTYPE
> > b7ede000-b7edf000 r--p 00000000 16:05 498634    
> > /usr/lib/locale/en_US/LC_NUMERIC
> > b7edf000-b7ee0000 r--p 00000000 16:05 498637    
> > /usr/lib/locale/en_US/LC_TIME
> > b7ee0000-b7ee5000 r--p 00000000 16:05 498626    
> > /usr/lib/locale/en_US/LC_COLLATE
> > b7ee5000-b7ee6000 r--p 00000000 16:05 498632    
> > /usr/lib/locale/en_US/LC_MONETARY
> > b7ee6000-b7ee7000 r--p 00000000 16:05 498631    
> > /usr/lib/locale/en_US/LC_MESSAGES/SYS_LC_MESSAGES
> > b7ee7000-b7ee8000 r--p 00000000 16:05 498635    
> > /usr/lib/locale/en_US/LC_PAPER
> > b7ee8000-b7ee9000 r--p 00000000 16:05 498633    
> > /usr/lib/locale/en_US/LC_NAME
> > b7ee9000-b7eea000 r--p 00000000 16:05 498625    
> > /usr/lib/locale/en_US/LC_ADDRESS
> > b7eea000-b7eeb000 r--p 00000000 16:05 498636    
> > /usr/lib/locale/en_US/LC_TELEPHONE
> > b7eeb000-b7eec000 r--p 00000000 16:05 498629    
> > /usr/lib/locale/en_US/LC_MEASUREMENT
> > b7eec000-b7eed000 r--p 00000000 16:05 498628    
> > /usr/lib/locale/en_US/LC_IDENTIFICATION
> > b7eed000-b7eee000 rw-p b7eed000 00:00 0 
> > b7eee000-b7fe3000 r-xp 00000000 16:05 16065      /lib/libc-2.6.1.so
> > b7fe3000-b7fe4000 r--p 000f5000 16:05 16065      /lib/libc-2.6.1.so
> > b7fe4000-b7fe6000 rw-p 000f6000 16:05 16065      /lib/libc-2.6.1.so
> > b7fe6000-b7fea000 rw-p b7fe6000 00:00 0 
> > b7fea000-b7fff000 r-xp 00000000 16:05 16055      /lib/ld-2.6.1.so
> > b7fff000-b8001000 rw-p 00014000 16:05 16055      /lib/ld-2.6.1.so
> > bf808000-bf81e000 rw-p bf808000 00:00 0          [stack]
> > ffffe000-fffff000 r-xp 00000000 00:00 0          [vdso]
> > Aborted
> > 
> > 
> > I also got problems to use webcam with skype etc.
> > Can you help find the origin of the bug ?
> > 
> > Thanks very much.
> > 
> > Cheers, linuxcbon
> 
> 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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