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    SubjectRe: 2.6.22-rc1-mm1
    H. Peter Anvin wrote:
    > Andy Whitcroft wrote:
    >>> It definitely sounds like a memory clobber of some sort.
    >>>
    >>> Usual suspects, in addition to the input/output buffers you already
    >>> looked at, would be the heap and the stack. Finding where the stack
    >>> pointer lives would be my first, instinctive guess.
    >> The stack seems to be where it should be and seems to stay pretty much
    >> in the same place as it should. Adding checks for the heap also seem to
    >> stay within bounds. I've tried making the stack and the heap 64k to no
    >> effect.
    >>
    >> Moving the kernel to other places in memory seems to kill the decode
    >> completely during gunzip() which may be a hint I am not sure.
    >>
    >> This thing is trying to ruin my mind.
    >>
    >
    > Yours and mine both. Seems like *something* is clobbering memory, but
    > what and why is a mystery. The fact that putting the kernel in a higher
    > point in memory is a good indication that this clobber is at a
    > relatively high address.
    >
    > How much RAM does this machine have?

    This is as 12GB machine. 3 numa nodes.

    I checked out the location of the IDT and GDT and both seem sane, in the
    9xxxx range below the kernel destination.

    I also note that on another machine of this type, one Node only in that
    case some of the "did work" cases do not work. Also when I applied some
    of my patches on the top "working" cases stopped working. So whatever
    it is is definatly related to the shape of the kernel to be loaded.
    Very confusing.

    -apw
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