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    SubjectRe: 2.4.25 SMP - BUG at page_alloc.c:105
    On Wed, 24 Mar 2004, Andrew Morton wrote:

    > I'd suspect that's just gunk on the stack and that zap_pte_range() freed an
    > anonymous page which had a non-null ->mapping. It could be a hardware bug.
    > Without seeing the actual value of page->mapping it's hard to know.

    Any chance to retrieve that when the machine has been rebooted since? I
    fear there is none.

    I have these log entries from boot-up (after the crash), seems the BIOS
    isn't perfect (Tyan S2460 "Tiger MP" w/ BIOS 1.05):

    ...
    128MB HIGHMEM available.
    896MB LOWMEM available.
    ACPI: have wakeup address 0xc0002000
    found SMP MP-table at 000f7510
    hm, page 000f7000 reserved twice.
    hm, page 000f8000 reserved twice.
    hm, page 0009f000 reserved twice.
    hm, page 000a0000 reserved twice.
    On node 0 totalpages: 262144
    zone(0): 4096 pages.
    zone(1): 225280 pages.
    zone(2): 32768 pages.
    ACPI: Unable to locate RSDP
    Intel MultiProcessor Specification v1.4
    Virtual Wire compatibility mode.
    OEM ID: TYAN Product ID: GUINNESS APIC at: 0xFEE00000
    Processor #1 Pentium(tm) Pro APIC version 16
    Processor #0 Pentium(tm) Pro APIC version 16
    I/O APIC #2 Version 17 at 0xFEC00000.
    Enabling APIC mode: Flat. Using 1 I/O APICs
    Processors: 2
    Kernel command line: root=/dev/hda5 vga=791 splash=silent showopts noapic
    Initializing CPU#0
    Detected 1533.378 MHz processor.
    Console: colour dummy device 80x25
    Calibrating delay loop... 3060.53 BogoMIPS
    Memory: 1032772k/1048576k available (1902k kernel code, 15416k reserved, 636k data, 152k init, 131072k highmem)
    ...
    Intel machine check reporting enabled on CPU#0.
    CPU: After generic, caps: 0383fbff c1cbfbff 00000000 00000000
    CPU: Common caps: 0383fbff c1cbfbff 00000000 00000000
    CPU0: AMD Athlon(tm) MP 1800+ stepping 02
    Intel machine check reporting enabled on CPU#1.
    CPU: After generic, caps: 0383fbff c1cbfbff 00000000 00000000
    CPU: Common caps: 0383fbff c1cbfbff 00000000 00000000
    CPU1: AMD Athlon(tm) Processor stepping 02
    Total of 2 processors activated (6121.06 BogoMIPS).
    Using local APIC timer interrupts.
    calibrating APIC timer ...
    ..... CPU clock speed is 1533.3658 MHz.
    ..... host bus clock speed is 266.6723 MHz.
    cpu: 0, clocks: 2666723, slice: 888907
    CPU0<T0:2666720,T1:1777808,D:5,S:888907,C:2666723>
    cpu: 1, clocks: 2666723, slice: 888907
    CPU1<T0:2666720,T1:888896,D:10,S:888907,C:2666723>
    checking TSC synchronization across CPUs: passed.
    Waiting on wait_init_idle (map = 0x2)
    All processors have done init_idle
    mtrr: your CPUs had inconsistent fixed MTRR settings
    mtrr: probably your BIOS does not setup all CPUs
    ACPI: Subsystem revision 20040116
    ACPI: Interpreter disabled.
    PCI: PCI BIOS revision 2.10 entry at 0xfd7e0, last bus=1
    PCI: Using configuration type 1
    PCI: Probing PCI hardware
    PCI: ACPI tables contain no PCI IRQ routing entries
    PCI: Probing PCI hardware (bus 00)
    BIOS failed to enable PCI standards compliance, fixing this error.
    I/O APIC: AMD Errata #22 may be present. In the event of instability try
    : booting with the "noapic" option.
    ...


    Don't waste countless efforts debugging this

    --
    Matthias Andree

    Encrypt your mail: my GnuPG key ID is 0x052E7D95
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