Windows: socket send error 10038 in debug.log #2587

Anyone around here that also has this error in his debug.log?

MSDN is telling this about 10038: WSAENOTSOCK 10038 Socket operation on nonsocket.

An operation was attempted on something that is not a socket. Either the socket handle parameter did not reference a valid socket, or for select, a member of an fd_set was not valid.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms740668%28v=vs.85%29.aspx

Looks like either a use-after-close or an error value that is not properly checked (and thus used a socket handle). Does it happen predictably? Another possibility is that somehow a non-socket value sneaks into one of the descriptor list of select.

On IRC @Diapolo mentioned that it was a socket send error, which would mean SocketSendData is called on a CNode without valid hSocket field.

See #2595.