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

[Michiel Konstapel]

On 27-06-2022 22:24, Nicolas Dufresne via gstreamer-devel wrote:
> 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
>>   

Alas, not quite. I've upgraded to Ubuntu 22.04 which has

$ uname -a
Linux xubuntux 5.15.0-40-generic #43-Ubuntu SMP Wed Jun 15 12:54:21 UTC 
2022 x86_64 x86_64 x86_64 GNU/Linux

But the problem persists.