gstreamer 1.20: v4l2bufferpool spams "newly allocated buffer is not free"

[Nicolas Dufresne]

Le dimanche 26 juin 2022 à 14:30 +0200, Michiel Konstapel a écrit :
> On 25-06-2022 17:34, Nicolas Dufresne via gstreamer-devel wrote:
> > > It's a very common Logitech C920 webcam (but I've seen the same message
> > > with a Z-Cam M3 camera). I think that uses a generic UVC driver? Anything
> > > I can run to get you more info?
> > > 
> > I'm asking as I cannot reproduce, and from the look of it, the trace implies
> > is will leak data. Which Kernel? Have you tested with your own GStreamer
> > build (main branch)?
> $ uname -a
>  Linux xubuntux 5.4.0-121-generic #137-Ubuntu SMP Wed Jun 15 13:33:07 UTC 2022

That might explain the discrepancy, this is an old kernel, its quite likely this
is a kernel bug and its fixed in newer kernels. Make sure to try more recently
Ubuntu and check. If it is, you likely can request a backport to Ubuntu,
assuming this isn't an EOL version you are using.

> x86_64 x86_64 x86_64 GNU/Linux
> Gstreamer is built from source, from the 1.20.3 tag.
> I have also just built it from main (commit
> 0e551871c45a1b9fd67d99d2d4f31a983f1b3217) and that shows the effect as well.
> Michiel
>