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action #68474

Updated by mkittler about 4 years ago

I have updated my SLE15SP1 machine to current openQA and installed all SLE updates: 
 openQA-4.6.1592990132.f2d269d68-2896.1.noarch 
 os-autoinst-4.6.1592908950.5038d8c2-458.1.x86_64 
 libopencv3_4-3.4.10-2.1.x86_64 

 Previously installed openQA version was from January. 

 Then I got failures in tests that worked before: 
 after x11_start_program('xterm') on GNOME desktop the xterm did not appear. 
 With vnc client I checked that xterm actually appeared, just the openQA screen was not updated. 

 After more debugging I have found that 
 ``` 
  
 $sim = $lastscreenshot->similarity($image) if $lastscreenshot; 
 ``` 
 in backend/baseclass.pm method enqueue_screenshot returns NaN and this breaks all further updates. 

 The following change apparently fixed the issue, but I don't understand why norm() could return NaN. Maybe the image is somewhat broken. 
 ``` 
 

 --- a/ppmclibs/tinycv_impl.cc 
 +++ b/ppmclibs/tinycv_impl.cc 
 @@ -301,6 +301,10 @@ double getPSNR(const Mat& I1, const Mat& I2) 
 
      double noise = norm(I1, I2); 
 
 +      if (std::isnan(noise)) { 
 +          return VERY_DIFF; 
 +      } 
 + 
      if (!noise) { 
          return VERY_SIM; 
      } 
 ``` 



 

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