CURRENT: Broken on > r246222?

CURRENT, as of recent Revision 246285 (see below) fails and
crashes/reboots on an Ivy-Bridge platform (see below). Since the box
does not have debugging switched on (not yet, will do eventually
Monday), Last thing I see on screen is

p4tcc3: <CPU Frequency Thermal Control> on cpu3

then the system run dark and reboots without any notice (kernel doesn't
have debugging switched on so far, will do this after Monday).

The box is running quite well with

FreeBSD 10.0-CURRENT #1 r246222: Fri Feb  1 23:13:28 CET 2013 (amd64)

but sources at:

root_at_gate [src] svn info
Path: .
Working Copy Root Path: /usr/src
URL: svn://svn.freebsd.org/base/head
Repository Root: svn://svn.freebsd.org/base
Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revision: 246285
Node Kind: directory
Schedule: normal
Last Changed Author: hrs
Last Changed Rev: 246283
Last Changed Date: 2013-02-03 11:26:24 +0100 (Sun, 03 Feb 2013)


fail. Is there a known issue with hardware like shown below? I have a
bunch of more modern Sandy- and Ivy-Bridge Intel driven boxes I'd like
to update next week (they run CURRENT as well) and I'm not sure by now
to do so.

The crash occurs with a GENERIC kernel as well as with the custom kernel
(working output is the custom kernel).



dmesg:
CPU: Intel(R) Core(TM) i3-3220 CPU _at_ 3.30GHz (3300.09-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x306a9  Family = 0x6  Model = 0x3a
Stepping = 9

Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>

Features2=0x3d9ae3bf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,POPCNT,TSCDLT,XSAVE,OSXSAVE,AVX,F16C>
  AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
  AMD Features2=0x1<LAHF>
  Standard Extended Features=0x281<GSFSBASE,SMEP,ENHMOVSB>
  TSC: P-state invariant, performance statistics
real memory  = 17179869184 (16384 MB)
avail memory = 16221089792 (15469 MB)
Event timer "LAPIC" quality 600
ACPI APIC Table: <ALASKA A M I>
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s) x 2 SMT threads
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
netmap: loaded module
ctl: CAM Target Layer loaded
smbios0: <System Management BIOS> at iomem 0xf04c0-0xf04de on motherboard
smbios0: Version: 2.7, BCD Revision: 2.7
cryptosoft0: <software crypto> on motherboard
aesni0: No AESNI support.