http://bugs.winehq.org/show_bug.cgi?id=11232
--- Comment #6 from Alexandre Julliard julliard@winehq.org 2008-01-17 08:37:37 --- What you have to do is after ulimit -c unlimited, do something that causes the server crash, then run wine again and wineserver should print a message stating that it crashed last time and how to get the backtrace for it.
If that doesn't work, search for the core file in /tmp/.wine*, then do a 'gdb wineserver <the-core-file>' and type 'backtrace' at the gdb prompt.