Thus spake Phil Nelson
> To summarize, a -current i386 GENERIC kernel built today hangs during boot.

This might sound completely off the wall but try disabling the msdos
filesystem in the configuration and rebuild the kernel.  This sounds
like a problem I was having except that I dropped into the debugger so
I was able to see where it was crashing.

-- 
D'Arcy J.M. Cain <darcy@{druid|vex}.net>   |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on         
+1 416 424 2871     (DoD#0082)    (eNTP)   |  what's for dinner.