https://bugs.winehq.org/show_bug.cgi?id=42738
--- Comment #3 from Henri Verbeet hverbeet@gmail.com --- The easiest is probably to create a WINEDEBUG=+d3d11,+tid log and check if there are calls from different threads. (E.g. by sorting the log and comparing top and bottom, although you can usually tell just by looking at it.)