[Bug 200725] Panic during port build under 10.1-Release Unrecoverable machine check exception

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200725

            Bug ID: 200725
           Summary: Panic during port build under 10.1-Release
                    Unrecoverable machine check exception
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dodo1 at videotron.ca

Created attachment 157558
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=157558&action=edit
Results of  portmaster -L

Ever since I installed FreeBSD 10.1-RELEASE exclusively from port builds, I've
always experienced kernel panic shutdowns from time to time, especially the big
builds like GNU toolchain and Xorg.  I would resume the build, and the
installation would eventually go through.  On that note, panics never occurred
while just using the system, i.e. not building a port.

I searched the Internet for a solution to fix this problem, but to no avail. 
It was suggested in a forum that the CPU might be overheating.  My computer is
brand new, and I changed the BIOS setting to have the fans run full time.

And then, I found how to read the core files...  Here's one:

# kgdb kernel /var/crash/vmcore.9
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
This GDB was configured as "amd64-marcel-freebsd"...

Unread portion of the kernel message buffer:
MCA: Bank 1, Status 0xbf80000000000124
MCA: Global Cap 0x0000000000000c09, Status 0x0000000000000005
MCA: Vendor "GenuineIntel", ID 0x306c3, APIC ID 7
MCA: CPU 7 UNCOR PCC DCACHE L0 WR error
MCA: Address 0x1119e9c80
MCA: Misc 0x86
MCA: Bank 1, Status 0xbf80000000000124
MCA: Global Cap 0x0000000000000c09, Status 0x0000000000000005
MCA: Vendor "GenuineIntel", ID 0x306c3, APIC ID 6
MCA: CPU 6 UNCOR PCC DCACHE L0 WR error
MCA: Address 0x1119e9c80
MCA: Misc 0x86
panic: Unrecoverable machine check exception
cpuid = 7
KDB: stack backtrace:
#0 0xffffffff80963000 at kdb_backtrace+0x60
#1 0xffffffff80928125 at panic+0x155
#2 0xffffffff80e3b89b at mca_intr+0x6b
#3 0xffffffff80d244b9 at trap+0x99
#4 0xffffffff80d0a782 at calltrap+0x8
Uptime: 6m42s

But now, I can't even upgrade VirtualBox, Firefox, and install Eclipse to try
it.

   portmaster virtualbox
and
   portmaster firefox
now systematically generates a kernel panic, so I'm stuck.

HELP!!!

Here's what's in my system at this time (in the attachment).

Don't hesitate to ask for more details to help isolate the problem.  However,
don't assume that I'm a UNIX expert.  Thanks for helping out!

Dominique.

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