The unit tests spew out:
Exception OverflowError: 'long int too large to convert' in \ <bound method YUVImageWrapper.__del__ of libyuv.YUVImageWrapper(YUV420P:(0, 0, 32768, 32768, 24):3_PLANES)> ignored
Fixed in r21148. (was caused by debug logging line..)
More instances found and fixed in r21151.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2066