Comment 41 for bug 529714

Why would LD_PRELOAD'ing libnss_wins.so fix the problem? If I get rhythmbox to load my freshly built libnss_wins.so instead of the one in /lib (using LD_LIBRARY_PATH) I can actually get some useful debugging info. Unless I'm going something totally wrong, rhythmbox is actually segfaulting on nsswitch/wins.c:95
I'll attach a full backtrace from gdb.