mozilla-1.9.2 linux64 debug builds are perma red. Not sure if something changed on the build side but it looks to have cropped up during our chemspill (which shouldn't have mucked with anything).
Turns out that builder has been busted since 2010-03-22, and was hidden on tinderbox.m.o's admintree page. When we recently switched to tbpl-using-buildbot-data that wasn't brought over. Now fixed up.