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Considering the reason the backend died is Encoder not accepting data at /usr/lib/os-autoinst/backend/baseclass.pm line 157. this is likely the imwrite call within videoencoder.cpp. However, that call is only done when the last PNG is required (when someone views the running test).

The test also has the new warnings (WARNING: cv::norm() returned NaN (poo#68474)) so it might be a consequence of working around that problem (see #68474).

I can hit the same issue during test cases continuously running: "Result: incomplete, Reason: backend died: Encoder not accepting data at /usr/lib/os-autoinst/backend/baseclass.pm line 157."

[0mterminate called after throwing an instance of 'cv::Exception'
what(): OpenCV(4.3.0) /home/abuild/rpmbuild/BUILD/opencv-4.3.0/modules/imgcodecs/src/loadsave.cpp:738: error: (-215:Assertion failed) !_img.empty() in function 'imwrite'

My system is openSUSE Tumbleweed 20200628 with the latest openQA and os-autoinst version (4.6.1593615708.5a3bf43f8).

This issue almost blocks my testing.

@ggardet_arm So it looks like your version is similarly configured (and also not using OpenCL).

@dawei_pang Do the tests also fail when you don't watch them (no browser tab with the job is open)? Is this happening only on some tests (and if yes, which)? Where did you install opencv from? (I'm using currently 4.3.0-1.1 from official TW repos and haven't run into the issue.)

mkittler wrote:

@dawei_pang Do the tests also fail when you don't watch them (no browser tab with the job is open)? Is this happening only on some tests (and if yes, which)? Where did you install opencv from? (I'm using currently 4.3.0-1.1 from official TW repos and haven't run into the issue.)

The libopencv comes from TW repos. The test run was going to stop and fail when watch or not.
I add all test cases to a queue, the first is PASS, then the issue occurs at the beginning of 2nd cases, if the issue occurs, all of followed test cases are failure one by one.

When the issue happen, the followed information always are observed in journal log:
Jul 03 00:33:47 openQAtest kernel: perl[2006]: segfault at 514 ip 000055fc3aed89e0 sp 00007f75a3567830 error 4 in perl[55fc3ae18000+1fa000]
Jul 03 00:33:47 openQAtest kernel: Code: ee f8 33 00 e8 41 d3 f6 ff 8d 53 f9 83 e2 fb 74 05 83 fb 04 75 14 89 df 48 8b 80 d8 07 00 00 31 d2 5b 31 f6 ff e0 0f 1f 40 00 80 14 05 00 00 01 75
e3 48 8b 90 a8 05 00 00 48 85 d2 74 33 83

Since the issue is blocked my testing, I switch the system from TW to Leap15.2, but the issue is able to reproduce: libopencv3_3-3.3.1-lp152.7.9.x86_64

The test run was going to stop and fail when watch or not.

Then - despite Encoder not accepting data - this failing imwrite call might not even come from the videoencoder. (The videoencoder only uses this function to produce the last PNG for the live view.)

Since the issue is blocked my testing, I switch the system from TW to Leap15.2, but the issue is able to reproduce

In conclusion (taking the other reports into account as well) this issue is happening with OpenCV 3 and 4 and across different distributions (TW, Leap 15.2, SLE15SP1).

@dawei_pang Do you get the log message WARNING: cv::norm() returned NaN (poo#68474) in the failing tests?

I did not see it lately.