Messages in this thread | | | Date | Wed, 16 Jun 2004 17:06:02 -0700 | From | Tim Hockin <> | Subject | Opteron fatal machine check during PCI probe |
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Hey all,
I have a couple dual Opteron boxen that consistently gets an MCE during PCI probing. This is from linux-2.6.6, but the EXACT same scenario happens on a 2.4.x kernel.
The MCE shows that the error is an IO read, with the address 0xfdfc000cfe. The RIP points to pci_conf1_read(), when we try to inw() from the PCI data register.
This is called during the PCI probing, and stops the kernel dead in it's tracks. The disassembly of the surrounding code is:
ffffffff802822c5: 89 ca mov %ecx,%edx ffffffff802822c7: 83 e2 02 and $0x2,%edx ffffffff802822ca: 66 81 c2 fc 0c add $0xcfc,%dx ffffffff802822cf: 66 ed in (%dx),%ax
This all seems legit to me.
What is interesting is that the address 0xfdfc000cfe is correct in the low-order 16 bits. The extra 0xfdfc000000 is what is puzzling to me, or maybe it's a red herring.
I added a show_registers() to the MCE handler, and %rdx *really* is all zeros, other than the 0xcfe.
If I disable MCE, then the system boot fine, and runs fine.
Anyone have any ideas?
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