Ok, I tried building xine-ui and libxine1 with debugging options (by
setting DEB_BUILD_OPTIONS to "debug nostrip" and then apt-get -b source
<each package>). I'm not sure if it actually worked, because the
backtrace is rather anemic, but here goes:
chance@debian:~$ gdb /usr/bin/xine core.1285
(gdb) bt
#0 0x70180cbc in _x_cache_plugin_get_instance ()
from /usr/lib/libxine.so.1
#1 0x77863258 in ?? ()
from /usr/lib/xine/plugins/1.0.1/xineplug_dmx_qt.so
#2 0x77863258 in ?? ()
from /usr/lib/xine/plugins/1.0.1/xineplug_dmx_qt.so