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    SubjectRe: [OOPS] repeatable 2.4.8-ac7, 2.4.7-ac6 just run xdos
    Paul wrote:
    >
    > * Kernel oops, and locks up when I run xdos (dosemu)
    >
    > * Occuring in both 2.4.7-ac6 and 2.4.8-ac7. Run 'xdos' in X, and
    > machine locks hard, only output to console is oops. (no sysrq)
    > Tried once with strace, but no oops. (didnt wait long, though)
    > Some oops before window is placed, some a little while after.
    > (mouse movement?) Repeatable.
    >
    > * Kernels are virgin linus patched with ac. AMD-K6(tm) 3D
    > processor
    >
    > * If anyone wants any more info or for me to do anything, just
    > ask.
    >
    > Paul
    > set@pobox.com
    >
    > (2.4.7-ac6 -- two captured, identitcal, first shown)
    >
    > ksymoops 2.4.1 on i586 2.4.7-ac6. Options used
    > -V (default)
    > -k /proc/ksyms (default)
    > -l /proc/modules (default)
    > -o /lib/modules/2.4.7-ac6/ (default)
    > -m /boot/System.map-2.4.7-ac6 (specified)
    >
    > CPU: 0
    > EIP: 0010:[<c0180a18>]
    > Using defaults from ksymoops -t elf32-i386 -a i386
    > EFLAGS: 00010002
    > eax: 00001000 ebx: c4562368 ecx: 00000000 edx: 00000001
    > esi: c4562368 edi: c4a954d4 ebp: 00000001 esp: c6887d88
    > ds: 008 es: 0000 ss: 0018
    ^^^^
    Here is your problem. %es is set to the null segment. I had my
    suspicions about the segment reload optimisation in the -ac kernels, and
    this proves it. Try backing out the changes to arch/i386/kernel/entry.S
    and include/asm-i386/hw_irq.h and see if that fixes the problem.

    --

    Brian Gerst
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