I tried to boot the latest snapshot (GENERIC-73) on my Q650 today.
I've been using a 1.3 kernel for a while now, so I thought I'd see how
things are going with UVM.
The last line before it crashed was this:
zsc0 channel 0: d_speed 9600 DCD clk 0 CTS clk 0trap type 1, code = 0x0, \
	v = 0x48e7fffe
Kernel program counter = 0x11eae6
Kernel: Address error trap
pid = 0, pc = 0011EAE6, ps = 2104, sfc = 1, dfc = 1
Registers:
	    0	     1	      2	       3	4	 5	  6        7
dreg 004E1200 00000001 00000001 00000000 0000000A 00000030 00000000 00000000
areg 48E7FFFF 00000000 004E1200 0011DC54 00000000 00000000 001D8B2C FFFFCFFC

Kernel stack (001D8A80)
[lengthy list of numbers deleted, part of which was laboriously copied]

Here's the trace (well, part of it, it was wicked long so I left off most 
of it):
_Debugger(2104, 16a7f0, 1d8ab8, 12facc, 12f73a) + 6
_panic(12f73a, 1, 0, a, 30) + 50
_trap(1, 0, 48e7fffe) + 236
faultstkadj(4e1200) + 0
_zssoft(0) + 30
_trap(9,0,0) + 3de
rei(?)
_ite_put_char(a, a, 1d8bfc, 1317e8, b00) + 98
...

Anyone have any ideas?

TIA
-Simon Raahauge DeSantis