https://bugs.winehq.org/show_bug.cgi?id=34588
--- Comment #10 from André H. nerv@dawncrow.de --- coming back here quite late...
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x40022048) = 2103 --- SIGSEGV (Segmentation fault) @ 0 (0) ---
I guess it was just a buggy kernel or libc, as i never was able to reproduce it, this is my best guess