gstreamer v4l2 kernel Oops

Nicolas Dufresne nicolas at
Thu Jul 11 14:53:56 UTC 2019

Le jeudi 11 juillet 2019 à 08:08 -0500, Andrea a écrit :
> It seems that I managed to solve the problem, the only thing is during the dq
> of the buffer that appears "gst_v4l2_allocator_qbuf: <v4l2src0: pool: src:
> allocator> driver pretends buffer is not queued even if queue succeeded".
> How can solve that "problem"? 

This is a bug in videobuf2 which has been fixed in recent kernels.
Normally the workaround next to this warning works for every cases,
hence you should not have to worry.

> In vidioc_dqbuf I unset the buffer flags: 
> /buffer.flags &= ~V4L2_BUF_FLAG_QUEUED;
>  buffer.flags &= ~V4L2_BUF_FLAG_DONE;/
> --
> Sent from:
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at
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