Same issue here:
Inconsistency detected by ld.so: dl-close.c: 771: _dl_close: Assertion
`map->l_init_called' failed!

Mesa 9.2rc2 (same with rc1), dri2proto 2.8, libvdpau 0.7.
I believe my distribution's libvdpau was compiled with dri2proto support, but
is there a way to confirm?