Linux Debian, 64bit, GTX1080
Broken: latest master rBecab7be, debug builds
Worked: no idea
Short description of error
Assert failure happens in in brush projection. Quite hard to reproduce, so .blend file saved from gdb is attached :)
Exact steps for others to reproduce the error
Assert failure happens with the following stacktarce
Here is a demo file. Just over the mouse in the viewport.
P.S. File is saved from gdb, and still has operator running. This might be another problem.