System information (version)

• OpenCV => Master
• Operating System / Platform => Windows 64 Bit
• Compiler => Visual Studio 2015

Detailed description

The CUDA canny edge detector (cudaimgproc/src/canny.cpp) has a bug on line 221, which is:
map_.setTo(Scalar::all(0));
This call is ignoring the stream, which when using prioritized streams causes synchronization problems. The line should be:
map_.setTo(Scalar::all(0), stream);

Steps to reproduce

The code is self-evident.