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    SubjectRe: UVCvideo: Failed to resubmit video URB (-27) with Linux 3.3.3
    Date
    Hi Anisse,

    On Thursday 26 April 2012 20:07:21 Anisse Astier wrote:
    > Hi,
    >
    > I'm experiencing a problem with uvcvideo with kernel 3.3.3 and today's
    > Linus' tree.
    >
    > Problem not reproduced in 3.2.15, so this could be labelled as a regression.
    >
    > See webcam lsusb and (verbose!) dmesg log in attachment, which exhibits
    > the problem.
    >
    > We see lots of error (-18 = -EXDEV), that indicate that URB was too late
    > and then dropped, and they add up until we reach the "Failed to resubmit
    > video URB" scheduling issue.

    Those are USB controller issues. The uvcvideo driver submits URBs with the
    URB_ISO_ASAP transfer flag, so the controller should not fail to schedule
    them.

    > Installed libv4l version is 0.8.6.
    > I'm reproducing this with: gst-launch-0.10 --verbose v4l2src ! xvimagesink
    > (Skype exhibits the problem too, while it isn't using gstreamer, so it
    > really seems to come from kernel. Also, doesn't happen with 3.2)
    >
    > This is the first part of the problem. The second part is that if I
    > restart the webcam with gst-launch after the first failure, I have a
    > total freeze, just after these messages in the log (fetched with
    > netconsole, I wasn't able to get a panic trace):
    >
    > [ 191.796217] uvcvideo: Marking buffer as bad (error bit set).
    > [ 191.796233] uvcvideo: Marking buffer as bad (error bit set).
    > [ 191.796244] uvcvideo: Marking buffer as bad (error bit set).
    > [ 191.796252] uvcvideo: Marking buffer as bad (error bit set).
    > [ 191.796259] uvcvideo: Frame complete (EOF found).
    > [ 191.796265] uvcvideo: EOF in empty payload.
    > [ 192.972803] uvcvideo: Marking buffer as bad (error bit set).
    > [ 192.972818] uvcvideo: Dropping payload (out of sync).
    > [ 194.289463] uvcvideo: Marking buffer as bad (error bit set).
    > [ 194.289478] uvcvideo: Frame complete (FID bit toggled).
    > [ 194.289486] uvcvideo: Marking buffer as bad (error bit set).
    > [ 194.289493] uvcvideo: Frame complete (FID bit toggled).
    > [ 194.289499] uvcvideo: Marking buffer as bad (error bit set).
    > [ 194.289505] uvcvideo: Frame complete (FID bit toggled).
    > [ 194.289511] uvcvideo: Marking buffer as bad (error bit set).
    > [ 194.289518] uvcvideo: Frame complete (FID bit toggled).
    > [ 194.289524] uvcvideo: Marking buffer as bad (error bit set).
    > [ 194.289531] uvcvideo: Frame complete (FID bit toggled).
    >
    > Last but not least, uvcvideo is un-bisectable because there were a few
    > crash-fixes during the 3.3 development cycle. I started bisecting and got
    > kernel panics.

    Are the kernel panics related to uvcvideo ? There's one known bug introduced
    between v3.2 and v3.3 and fixed (before v3.3) in commit
    8e57dec0454d8a3ba987d18b3ab19922c766d4bc.

    --
    Regards,

    Laurent Pinchart



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