http://bugzilla.kernel.org/show_bug.cgi?id=11714





------- Comment #38 from [EMAIL PROTECTED]  2008-10-20 05:36 -------
Hi Paul,

Just tested 2.6.24.7 the latest official stable 2.6.24 kernel on
a down-cored Phenom CPU. No panic occurred.

I don't know how different the Ubuntu kernel (2.6.24-19-server) is from
the official kernels.
Thus I highly suggest that you retest with an official kernel.
E.g. you can use the recently released 2.6.27 kernel.

Furthermore I have seen following lines in your dmesg:

  mtrr: your CPUs had inconsistent fixed MTRR settings
  mtrr: probably your BIOS does not setup all CPUs.
  mtrr: corrected configuration.

So your BIOS is at least "suboptimal".

Last not least there seems to be a new BIOS availale for your mobo.

 1001 BIOS of M3A-H/HDMI (It's from 2008/10/07):
 1. Resolve system is freezing after set USB
    hard disk to the first boot device in BIOS.
 2. Enhance system stability when using certain memory.
 3. Fix C1E function fail issue.

As further steps I suggest:
(1) update BIOS and retest
(2) install mainline kernel and retest
(3) do further debugging if needed


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