Revision 248649 - causes panic during boot

Hello:

I have identified svn Revision 248649 as causing my system to panic during 
boot up. http://svnweb.freebsd.org/base?view=revision&revision=248649

I have verified this by doing the following:

svn up -r 248648 - buildkernel, installkernel, reboot = boot successful
svn up -r 248649 - buildkernel, installkernel, reboot = causes panic

The panic happens just after the line that says:
Entropy harvesting interrupts: Ethernet point to point, then
Fatal Trap 9 General Protection Fault, and then an automatic reboot.

Here is some system info:
FreeBSD 10.0-CURRENT #49 r248648: Tue Mar 26 14:55:28 CDT 2013
     root_at_FBSD10:/usr/obj/usr/src/sys/MYKERNEL amd64
FreeBSD clang version 3.2 (tags/RELEASE_32/final 170710) 20121221
CPU: AMD Phenom(tm) II X6 1045T Processor (2700.05-MHz K8-class CPU)
   Origin = "AuthenticAMD"  Id = 0x100fa0  Family = 0x10  Model = 0xa 
Stepping = 0

Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
   Features2=0x802009<SSE3,MON,CX16,POPCNT>
   AMD 
Features=0xee500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM,3DNow!+,3DNow!>
   AMD 
Features2=0x37ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,SKINIT,WDT>
   TSC: P-state invariant, performance statistics
real memory  = 17179869184 (16384 MB)
avail memory = 15951269888 (15212 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <HPQOEM SLIC-CPC>
FreeBSD/SMP: Multiprocessor System Detected: 6 CPUs
FreeBSD/SMP: 1 package(s) x 6 core(s)
  cpu0 (BSP): APIC ID:  0
  cpu1 (AP): APIC ID:  1
  cpu2 (AP): APIC ID:  2
  cpu3 (AP): APIC ID:  3
  cpu4 (AP): APIC ID:  4
  cpu5 (AP): APIC ID:  5
ACPI BIOS Bug: Warning: Optional FADT field Pm2ControlBlock has zero 
address or length: 0x0000000000000000/0x1 (20130214/tbfadt-626)
ioapic0 <Version 2.1> irqs 0-23 on motherboard
kbd1 at kbdmux0
ctl: CAM Target Layer loaded
acpi0: <HPQOEM SLIC-CPC> on motherboard
acpi0: Power Button (fixed)
acpi0: reservation of fee00000, 1000 (3) failed
acpi0: reservation of ffb80000, 80000 (3) failed
acpi0: reservation of fec10000, 20 (3) failed
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, c7f00000 (3) failed
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
cpu4: <ACPI CPU> on acpi0
cpu5: <ACPI CPU> on acpi0
attimer0: <AT timer> port 0x40-0x43 irq 0 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 950
Event timer "HPET" frequency 14318180 Hz quality 450
Event timer "HPET1" frequency 14318180 Hz quality 450
Event timer "HPET2" frequency 14318180 Hz quality 450
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0

The following is the last commit that works:
# cd /usr/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: 248648
Node Kind: directory
Schedule: normal
Last Changed Author: des
Last Changed Rev: 248648
Last Changed Date: 2013-03-23 09:52:31 -0500 (Sat, 23 Mar 2013)

Would you please review the commit for anything that may cause a panic 
during boot up.  Let me know if there is any more info that I should 
provide.  Should I file a PR?

Thank you in advance for reviewing this.