Re: 2.4.3-ac10/ac11 crash at boot in PDC20265 check

From: Manuel McLure (manuel@mclure.org)
Date: Sat Apr 21 2001 - 22:19:37 EDT

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    On 2001.04.21 19:02 Alan Cox wrote:
    > > Found promise 20265 in RAID mode." message. I diffed ide-pci.c between
    > ac5
    > > (which worked) and ac10 (which fails) and found that the only change
    > was
    > > the check for the PDC20265 - I commented this out and the kernel boots
    > fine
    > > now.
    >
    > Can you send me the oops data. I'll take a look and figure out what is
    > up.
    > My first guess would be its a NULL pointer error ?

    Yes, it's a NULL pointer dereference. I copied down part of the Oops - I'll
    have to put the code back before I can copy down the rest. Here's what I
    have until now:

    Unable to handle kernel NULL pointer dereference at virtual address
    00000024 printing eip:
    c02a71de

    pgd entry c0101000: 0000000000000000
    pmd entry c0101000: 0000000000000000
    .. pmd not present!
    Oops: 0000
    CPU: 0
    EIP: 0010:[<c02a71de>]
    EFLAGS: 00010286

    According to System.map, c02a71de is in the middle of ide_setup_pci_device
    which makes sense. ide_setup_pci_device starts at c02a7020. 

    -- 
Manuel A. McLure KE6TAW | ...for in Ulthar, according to an ancient
<manuel@mclure.org>     | and significant law, no man may kill a cat.
<http://www.mclure.org> |             -- H.P. Lovecraft

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