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    SubjectSegfaulting programs with CONFIG_HIMEM on SMP PowerPC
    Greetings,

    I've noticed recently that kernels >=2.4.18 on my SMP G4 began to say
    this at boottime:
    Apr 13 15:03:20 spicymeatball kernel: Memory BAT mapping: BAT2=256Mb,
    BAT3=256Mb, residual: 256Mb
    Apr 13 15:03:20 spicymeatball kernel: Warning, memory limited to 512 Mb,
    use CONFIG_HIGHMEM to reach 512 Mb
    Apr 13 15:03:20 spicymeatball kernel: Total memory = 512MB; using 2048kB
    for hash table (at c0400000)

    This machine has 768M, so I happily checked CONFIG_HIMEM (although I
    thought CONFIG_HIMEM was for systems with >2G but I suppose that only
    applies on x86), recompiled, and got the full 768M.

    Memory BAT mapping: BAT2=256Mb, BAT3=256Mb, residual: 256Mb
    Total memory = 768MB; using 2048kB for hash table (at c0400000)
    Linux version 2.4.18 (root@spicymeatball) (gcc version 2.95.3 19991030
    (prerelease/franzo/20001125)) #2 SMP Sat Apr 13 15:06:45 EDT 2002

    A few hours later, I fired up dig to do a query.. it subsequently dumped
    a core..
    I was a little suprised by this.. so I ran it again.. no crash this
    time. Looking around the system, I found a few more core files.. one
    from bash here, another from sshd there.. it began to get a little
    unnerving.. they all weren't signal 11's either.. Some were SIGILL, some
    were SIGTRAP, etc. odd. So, after deleting the various cores.. I
    rebooted to the non config_himem kernel and tried to get these utilities
    to crash.. no dice.. everything was hunky-dory (except that I only had
    512M..) How should I proceed here? So far I've gone back to a
    bitkeeper pull of 2.4.18-pre1, which doesn't ask me to use CONFIG_HIMEM,
    detects all of my memory and seems rock-solid. Newer kernels that want
    CONFIG_HIMEM all behave the same, with seemingly random coredumping
    executables.
    I'm using glibc-2.2.4, gcc version 2.95.3 19991030
    (prerelease/franzo/20001125), BFD 2.11.2

    Pleas CC me any replies, as I don't subscribe to the list.

    thanks,

    Ethan


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