Help with machine check exception

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Can someone help determine the problem here? Does it definitely point to a bad CPU, or possibly a bad motherboard?
Thanks!

CPU 0: Machine Check Exception:                4 Bank 4: b200000000070f0f
TSC 184fcd0553e4
Kernel panic - not syncing: Machine check

Call Trace: <#MC> <ffffffff80134831>{panic+133} <ffffffff8034329c>{_spin_trylock+9}
       <ffffffff8010f4d3>{oops_begin+90} <ffffffff801149f8>{print_mce+136}
<ffffffff80114abf>{mcheck_timer+0} <ffffffff801150cd>{do_machine_check+752}
       <ffffffff8010ee6f>{machine_check+127}  <EOE>
 NMI Watchdog detected LOCKUP on CPU 0
CPU 0
Modules linked in: nfs lockd nfs_acl ipv6 parport_pc lp parport autofs4 sunrpc xfs export fs dm_mod video button battery ac ohci_hcd i2c_amd8111 i2c_amd756 i2c_core shpchp eepro10
0 e100 mii tg3 floppy ext3 jbd
Pid: 14041, comm: srt Tainted: G   M  2.6.14-1.1656_FC4smp #1
RIP: 0010:[<ffffffff80118242>] <ffffffff80118242>{__smp_call_function+107}
RSP: 0000:ffffffff804a8358  EFLAGS: 00000002
RAX: 0000000000000002 RBX: 0000000000000003 RCX: 0000ffff0000ffff
RDX: 0000000000000004 RSI: 0000000000000020 RDI: ffffffff80523be0
RBP: 0000000000000000 R08: ffff8100826b71e0 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8011abcb R12: ffffffff80117f0b
R13: 0000000000000000 R14: ffffffff80360d29 R15: 0000000000000001
FS:  00002aaaaae8ad00(0000) GS:ffffffff80518000(0000) knlGS:00000000f7fab6c0
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffffc07000 CR3: 00000000c2f42000 CR4: 00000000000006e0
Process srt (pid: 14041, threadinfo ffff8100bd0ba000, task ffff8100822000c0)
Stack: ffffffff80117f0b 0000000000000000 0000000000000002 0000000000000000
       0000000000014f00 0000000000000001 0000000000000000 0000000000000000
       0000184fcd054eab ffffffff801182a0
Call Trace: <#MC> <ffffffff80117f0b>{smp_really_stop_cpu+0} <ffffffff801182a0>{smp_send_s
top+43}
       <ffffffff8013483d>{panic+145} <ffffffff8034329c>{_spin_trylock+9}
       <ffffffff8010f4d3>{oops_begin+90} <ffffffff801149f8>{print_mce+136}
<ffffffff80114abf>{mcheck_timer+0} <ffffffff801150cd>{do_machine_check+752}
       <ffffffff8010ee6f>{machine_check+127}  <EOE>

Code: 8b 44 24 10 39 c3 75 f6 85 ed 75 14 66 90 eb 18 f3 90 8b 44
console shuts up ...
<3>Debug: sleeping function called from invalid context at include/linux/rwsem.h:43
in_atomic():1, irqs_disabled():1

Call Trace: <NMI> <ffffffff8013603a>{profile_task_exit+21} <ffffffff801371f8>{do_exit+34} <ffffffff8025456d>{do_unblank_screen+40} <ffffffff8010f593>{bad_intr+0} <ffffffff80118ed0>{nmi_watchdog_tick+242} <ffffffff8010f835>{default_do_nmi+137} <ffffffff80117f0b>{smp_really_stop_cpu+0} <ffffffff80118ff9>{do_nmi+69} <ffffffff8010eb97>{nmi+127} <ffffffff80117f0b>{smp_really_stop_cpu+0} <ffffffff8011abcb>{flat_send_IPI_mask+0} <ffffffff80118242>{__smp_call_function+10
7}
        <EOE>  <#MC> <ffffffff80117f0b>{smp_really_stop_cpu+0}
       <ffffffff801182a0>{smp_send_stop+43} <ffffffff8013483d>{panic+145}
<ffffffff8034329c>{_spin_trylock+9} <ffffffff8010f4d3>{oops_begin+90}
       <ffffffff801149f8>{print_mce+136} <ffffffff80114abf>{mcheck_timer+0}
<ffffffff801150cd>{do_machine_check+752} <ffffffff8010ee6f>{machine_check+127}
        <EOE>
APIC error on CPU0: 00(08)
Kernel panic - not syncing: Aiee, killing interrupt handler!
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

Call Trace:<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <NMI> <7>APIC error on CPU0: 08(08)
<ffffffff80134831>{panic+133}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <ffffffff8034334a>{_spin_unlock_irq+14}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
<ffffffff80342cd1>{__down_read+50}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <7>APIC error on CPU0: 08(08)
<ffffffff803432e8>{_spin_lock_irqsave+9}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
<ffffffff801fde91>{__up_read+19}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <ffffffff80137255>{do_exit+127}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

<ffffffff8025456d>{do_unblank_screen+40}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <ffffffff8010f593>{bad_intr+0}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

<ffffffff80118ed0>{nmi_watchdog_tick+242}<7>APIC error on CPU0: 08(08)
 <ffffffff8010f835>{default_do_nmi+137}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
<ffffffff80117f0b>{smp_really_stop_cpu+0}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <ffffffff80118ff9>{do_nmi+69}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
<ffffffff8010eb97>{nmi+127}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <ffffffff80117f0b>{smp_really_stop_cpu+0}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
<ffffffff8011abcb>{flat_send_IPI_mask+0}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <ffffffff80118242>{__smp_call_function+107}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
 <EOE> <7>APIC error on CPU0: 08(08)
 <#MC> <7>APIC error on CPU0: 08(08)
<ffffffff80117f0b>{smp_really_stop_cpu+0}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
<ffffffff801182a0>{smp_send_stop+43}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <ffffffff8013483d>{panic+145}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
<ffffffff8034329c>{_spin_trylock+9}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <ffffffff8010f4d3>{oops_begin+90}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
<ffffffff801149f8>{print_mce+136}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
 <ffffffff80114abf>{mcheck_timer+0}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

       <7>APIC error on CPU0: 08(08)
<ffffffff801150cd>{do_machine_check+752}<7>APIC error on CPU0: 08(08)
 <ffffffff8010ee6f>{machine_check+127}<7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

        <EOE> <7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

 <7>APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)

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