Messages in this thread | | | Date | Tue, 6 Dec 2005 05:23:35 -0800 | From | Avuton Olrich <> | Subject | Re: Kernel panic: Machine check exception |
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On 12/6/05, Eric W. Biederman <ebiederm@xmission.com> wrote: > Although on the Opteron that is usually what it is (as memory > errors can be reported through the machine check interface) > > In this case bank 4 is the appropriate bank. Although the > other bits don't look right for a memory error. I wonder > if it is that darn iommu fault again. > > To decode an Opteron machine_check you can look in > the bios and kernel programmers guide. (Possibly the > architecture but I think that is too generic) to see > what all of the bits mean. > > It is a pain but is faster than poking blindly in > the dark. > > Eric
Wow, I'm glad you send a reply. I've been looking into RMA'ing this board and that would mean 3-4 weeks without a mobo, and I'd especially hate to think it's actually not a hardware problem after waiting that long. Something I did notice you said was about the IOMMU, which I guess i should have mentioned in the first place errors out in the beginning of the dmesg.
I get this same dmesg message in all kernels I have tried so far (vanilla and -mm) 2.6.13+
Maybe I should compile it out for now? Unfortunately this lockup isn't predictable, so I'm forced to just tool around until things lockup (usually happens between 15 minutes and 12 hours :))
Also, I am merely a layperson. I just took a quick look over http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26094.PDF and it's unreadable by myself.
PCI-DMA: Disabling IOMMU. ACPI-0412: *** Error: Handler for [SystemMemory] returned AE_AML_ALIGNMENT ACPI-0508: *** Error: Method execution failed [\_SB_.MEM_._CRS] (Node ffff81003ffb6f80), AE_AML_ALIGNMENT ACPI-0156: *** Error: Method execution failed [\_SB_.MEM_._CRS] (Node ffff81003ffb6f80), AE_AML_ALIGNMENT PCI: Bridge: 0000:00:04.0 IO window: disabled. MEM window: f0000000-f7ffffff PREFETCH window: e0000000-efffffff PCI: Bridge: 0000:00:10.0 IO window: c000-cfff MEM window: disabled. PREFETCH window: disabled.
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