https://bugs.winehq.org/show_bug.cgi?id=37669
--- Comment #3 from Dmitry Timoshkov dmitry@baikal.ru --- (In reply to Sebastian Lackner from comment #2)
If I understand you correctly we already have a patch for that: https://github.com/wine-compholio/wine-staging/blob/master/patches/ws2_32- WriteWatches/0001-ws2_32-Avoid-race-conditions-of-async-WSARecv-operat.patch
That patch fixes the problem, thanks. I have another workaround though: allocate a temporary buffer of the same size as passed to ws2_32 and use it for the recvmsg call, then just copy it to the application provided one.