-CURRENT freeze at boot after update

Hi,

I did my usual saturday -CURRENT sync (buildworld/kernel) this morning and my 
machine freezes at boot. The freeze occurs right after HD detection, and 
before (or during) mounting partitions :

sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
ums0: Logitech USB-PS/2 Optical Mouse, rev 2.00/11.10, addr 2, iclass 3/1
ums0: 3 buttons and Z dir.
Timecounter "TSC" frequency 2493036546 Hz quality 800
Timecounters tick every 1.000 msec
ad0: 78167MB <Maxtor 6Y080L0 YAR41BW0> at ata0-master UDMA133
acd0: DVDR <HL-DT-ST DVDRAM GSA-4163B/A105> at ata1-master UDMA33
ad4: 76319MB <Seagate ST380817AS 3.42> at ata2-master SATA150
<FREEZE HERE>

Booting my kernel.old works fine (fortunatly!).  I'm now looking at recent 
changes that could be the cause between Jan 7 and now.

Any suggestions?

Nicolas.

-- 
FreeBSD 7.0-CURRENT #10: Sat Jan  7 11:50:00 EST 2006     
root_at_clk01a:/usr/obj/usr/src/sys/CLK01A 
PGP? (updated 16 Nov 05) : http://www.clkroot.net/security/nb_root.asc