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    SubjectRE : Re: Question about Creative Webcam Pro PD1030 ? Bug ?

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

    > 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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