dwImageStreamer_waitPostedNvMedia() internal problem and segmentation fault in dwImageNvMedia_destroy()

I’m using DriveWorks SDK v0.6.67 to create some NvMedia -> CUDA cross process image streamers in order to make images acquired from 8 connected camera sensors available to multiple client processes.

As a starting point, I used the Driveworks example located at /usr/local/driveworks/samples/src/image/image_streamer_cross_process, setting a 10 seconds timeout for the image streamers.

The producer application runs fine for the first 40~45 minutes, but then the following error message gets printed on screen:

ImgAddFences: Couldn’t find a place to store the fences
NvMediaEglStreamProducerGetImage: Failed to add read fence
ImageStreamer: timeout waitPosted, producer waited for 10000 ms.

The call to dwImageStreamer_waitPostedNvMedia() then returns DW_TIME_OUT.

If I try to call dwImageStreamer_waitPostedNvMedia() again on the same streamer, I get the same result over and over again.

The consumer application does not display any error message from the corresponding streamer.

Since this error seems to be unrecoverable, the first solution that came to my mind was to destroy the faulty streamer object and then create a new image streamer to continue working with.

The problem with this approach is that, after the call to dwImageStreamer_waitPostedNvMedia() fails, the NvMedia image posted through the faulty streamer cannot be deleted via dwImageNvMedia_destroy() without causing a segmentation fault.

Am I misusing the image streamer in any way?
I also tried to use an NvMedia -> NvMedia cross process streamer (which the documentation states is ideal for cross-process applications), in order to see if changing the streamer type would have solved the problem, but the streamer creation always fails with a DW_NOT_AVAILABLE error.

I’m at a loss here… Can anybody please shed some light on the subject?

If that helps, the image streamers and the dwContextHandle_t object are created from different threads.

Any help would be greatly appreciated!

Thanks in advance!

Dear KungLao,

DriveWorks SDK v0.6.67 is too old version, could you please update the SDK to the latest version(1.2.400) if possible and then re-check this symptom?
Because we fixed bunch of issues in DriveWorks. Thanks.

Hi SteveNV,

thanks for your response.

Unfortunately updating the SDK is not an option at the moment.

Could there be any other way to get around the problem?
Did anyone else experience such an issue before?


Hi KungLao,

Have you clarified the cause and resolved the problem?
Or considering to move on the new version.
Please update the status then we can know how to support you.

Hi kayccc,

as of today, the problem is still unsolved.

As I said in my last post, updating the SDK is not possible for us at the moment.

One thing we noticed is that the less cameras we use, the longer the streamers stay up before one of them becomes unrecoverably faulty.

This is a seriously blocking issue for us, since we will very shortly begin to use all the cameras simultaneously.

Thanks in advance for your help.

Dear KungLao,

Even updating the SDK is not possible for your side, but there were similar issues on our side that did not reproduce the problem with the update PDK.
So if you have any extra DPX2 or environment, please check this issue with the new PDK. Thanks.