https://bugs.winehq.org/show_bug.cgi?id=55979
--- Comment #11 from Jean DELVARE jdelvare@suse.de --- I tried backporting the workaround to wine-staging, but Battle.net still crashes for me with an "unhandled stack overflow". Apparently I'll have a to let more seasoned wine developers deal with the issue.
I hope that we can come up with a workaround in wine-staging soon, because the next WotLK update on the server side will certainly require a client-side game update as well, and I won't be able to perform that update without a working Battle.net client.