Sensors returns negative temperatures intermittently

Results from sensors

These temperatures are quite normal to see, whilst I'd like to see them cooler, I don't have an air conditioned server room, just my garage:

Code:

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +99.0°C  (high = +84.0°C, crit = +100.0°C)
Core 1:       +93.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:       +94.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:       +94.0°C  (high = +84.0°C, crit = +100.0°C)


coretemp-isa-0001
Adapter: ISA adapter
Core 0:      +100.0°C  (high = +84.0°C, crit = +100.0°C)  ALARM (CRIT)
Core 1:       +93.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:       +96.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:       +98.0°C  (high = +84.0°C, crit = +100.0°C)  ALARM (CRIT)

Notice how ISA-0001 Core 0 has gone negative, it sometimes does this intermittently:

Code:

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +99.0°C  (high = +84.0°C, crit = +100.0°C)
Core 1:       +93.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:       +94.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:       +94.0°C  (high = +84.0°C, crit = +100.0°C)


coretemp-isa-0001
Adapter: ISA adapter
Core 0:       -27.0°C  (high = +84.0°C, crit = +100.0°C)  ALARM (CRIT)
Core 1:       +94.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:       +96.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:       +97.0°C  (high = +84.0°C, crit = +100.0°C)  ALARM (CRIT)

Any ideas? Could the core temperature be going over +100°C, and sensors just cant handle that number? Or it it likely to be the processor shutting down as it's temperature has gone above CRIT? (the upper readings show it at 100°C)

The temperature isn't always -27, here it's -25:

Code:

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +95.0°C  (high = +84.0°C, crit = +100.0°C)
Core 1:       +92.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:       +93.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:       +93.0°C  (high = +84.0°C, crit = +100.0°C)


coretemp-isa-0001
Adapter: ISA adapter
Core 0:       -25.0°C  (high = +84.0°C, crit = +100.0°C)  ALARM (CRIT)
Core 1:       +93.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:       +95.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:       +96.0°C  (high = +84.0°C, crit = +100.0°C)  ALARM (CRIT)

when it's gone to negative temperature I've tried lscpu to see if the core was going offline, but it appears ok:

Code:

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    1
Core(s) per socket:    4
Socket(s):             2
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 23
Stepping:              6
CPU MHz:               2003.000
BogoMIPS:              4666.93
Virtualisation:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              6144K
NUMA node0 CPU(s):     0-7

The machine is a DELL CS24-SC 1U high server with INTEL XEON E5410 processors. I've previously discussed other temperature related issues here: http://ift.tt/29RRTiJ

Thanks, Scott.

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Sensors returns negative temperatures intermittently