When running under qemu-user CPU emulation, this can mean we not only remove the vdso from the process being launched (a performance degradation), but also clobber it out from under the qemu-user emulator hosting the wine-preloader process - which is in fact in the midst of a call to mmap that is *using* the vdso, so the emulator then segfaults before returning
I'd call a QEMU bug.