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On 11/21/2011 10:29 PM, Don Brett wrote:
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On 11/21/2011 11:12 AM, Keith Pyle wrote:
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<pre wrap="">On 11/21/11 06:00, Manuel McLure wrote:
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<pre wrap="">On Sun, Nov 20, 2011 at 7:40 PM, Don Brett <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:dlbrett@zoominternet.net"><dlbrett@zoominternet.net></a> wrote:
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<pre wrap="">This is a little off-topic, but it's a new drive on a new Mythbuntu
installation. ?Symptoms are:
-partition table got corrupted (after about 50 hours on the drive); an
8-hour low level format got it back
-the box occasionally freezes-up for a few seconds
-I see multiple instances of these errors in /var/log/syslog:
Nov 20 09:54:02 zedo kernel: [ ? ?6.292384] EXT4-fs (sda2): re-mounted.
Opts: errors=remount-ro
Nov 20 09:55:12 zedo kernel: [ ? 81.573425] EXT4-fs (sda2): re-mounted.
Opts: errors=remount-ro,commit=0
Nov 20 09:58:51 zedo kernel: [ ?300.004041] [Hardware Error]: Machine
check events logged
?From /var/log/mcelog, I see multiple entries of this:
mcelog: failed to prefill DIMM database from DMI data
Kernel does not support page offline interface
mcelog: mcelog read: No such device
Hardware event. This is not a software error.
MCE 0
CPU 0 4 northbridge
MISC c008000001000000 ADDR 1844184
TIME 1321843678 Sun Nov 20 21:47:58 2011
? Northbridge NB Array Error
? ? ? ?bit42 = L3 subcache in error bit 0
? ? ? ?bit43 = L3 subcache in error bit 1
? ? ? ?bit46 = corrected ecc error
? ? ? ?bit59 = misc error valid
? ? ? ?bit62 = error overflow (multiple errors)
? memory/cache error 'evict mem transaction, generic transaction, level
generic'
STATUS dc074c60001c017b MCGSTATUS 0
MCGCAP 106 APICID 0 SOCKETID 0
CPUID Vendor AMD Family 16 Model 5
Hardware event. This is not a software error.
I replaced the sata drive cables, disconnected the dvd drive, tried a
different power supply. ?I also tried another drive on the same box (but
it was an ide) and had no errors. ?With a different motherboard...still
got the "re-mount" errors but none of the "[Hardware Error]" entries.
Anyone have a suggestion?
PS - the hardware is: (everything but the power supply and case is new)
-ASUS M4A78LT-M AM3 AMD 760G HDMI Micro ATX AMD Motherboard
-SAMSUNG EcoGreen F4 HD204UI 2TB SATA 3.0Gb/s 3.5" Internal Hard Drive
-ADATA Gaming Series 2GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
Desktop Memory
-ZOTAC ZT-20203-10L GeForce GT 220 1GB 128-bit DDR2 PCI Express 2.0 x16
HDCP Ready Video Card
-ThermalTake 430 power supply
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<pre wrap="">It's not a disk problem, that's a CPU or motherboard problem. The disk
corruption is caused by your memory contents getting corrupted and
being written to disk.
See <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://halobates.de/mce.pdf">http://halobates.de/mce.pdf</a> for details on exactly what a "machine
check exception" is.
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<pre wrap="">With the caveat that I'm not an expert on this...
I suspect your cache memory or perhaps the Northbridge (handles
communication among cores, possibly RAM, video) has a problem.
Depending on your specific CPU, the Northbridge may be on the CPU, i.e.,
CPU cores and Northbridge are all in one package. This is the case for
many recent, mainstream processors from both Intel and AMD.
The errors you included suggest a multi-bit error in the L3 cache. L3
is special memory where (a limited amount of) recently used instructions
and data are stored for faster access by the CPU than going to main
RAM. As Manuel wrote, if the cache is corrupted, it could lead to all
manner of intermittent and seemingly random problems, including those
you mentioned.
If this is a Northbridge/cache problem and the Northbridge is on the CPU
die, then your only fix will be to replace the CPU. If the Northbridge
is a separate chip on the motherboard, then you'll have to replace the
motherboard but could keep the CPU.
It may be worthwhile trying to see if Asus will help you if this a new
motherboard. (I have no personal experience with Asus support and don't
know if/how they will help.)
Keith
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<br>
I just notice that I hadn't included the cpu on the list of
hardware; it's an AMD Athlon II X3 445 Rana (3.1GHz Socket AM3 95W
Triple-Core Desktop Processor ADX445WFGMBOX). Apparently this
processor doesn't have an L3 cache (from Toms Hardware - <strong>Rana</strong>,
triple-core, no L3 cache (2.7+ GHz)), does that matter, or is the
cache on the motherboard?<br>
<br>
I looked up the features on the motherboard chipset, it has a
North Bridge (AMD 760G); I assume that means the cpu does not have
an integrated northbridge...right? So it looks like my problem
might be with the motherboard.<br>
<br>
Sidenote - Some other threads implied it might be a memory
problem, so I played with it a little. The box started with (2) 2
gig ddr3's. I removed one of the sticks...similar behavior.
Replaced that with the other stick (still running with a single
stick)...errors increased a lot, 2-3 errors a minute. Does that
mean anything?<br>
<br>
<br>
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I forgot to mention, I ran memtest86. I showed no errors after 5
passes (it ran for about 4 hours).<br>
<br>
Don<br>
<br>
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