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    Subject[BISECT] Boot failure on ia64.
    I bisected to this commit 3463a93def55c309f3c0d0a8aaf216be3be42d64

    3463a93def55c309f3c0d0a8aaf216be3be42d64 is first bad commit
    commit 3463a93def55c309f3c0d0a8aaf216be3be42d64
    Author: Alex Chiang <achiang@hp.com>
    Date: Wed Jun 11 17:29:27 2008 -0600

    [IA64] Update check_sal_cache_flush to use platform_send_ipi()
    ...

    This fails to boot on any sn2 ia64 with the sn2_defconfig.

    Here is the output from that boot.

    fs0:\efi\SuSE> elilo net0:holt/v1 root=/dev/sda7 console=ttySG0
    ELILO
    Uncompressing Linux... done
    Linux version 2.6.26-rc5-00223-g3463a93 (holt@attica) (gcc version 4.1.2 20070115 (prerelease) (SUSE Linux)) #14 SMP Tue Jun 24 07:27:34 CDT 2008
    EFI v1.10 by INTEL: SALsystab=0x6002c25f10 ACPI 2.0=0x6002c26000
    console [sn_sal0] enabled
    ACPI: RSDP 6002C26000, 0024 (r2 SGI)
    ACPI: XSDT 6002C297F0, 0044 (r1 SGI XSDTSN2 10001 7C)
    ACPI: APIC 6002C26870, 032C (r1 SGI APICSN2 10001 1)
    ACPI: SRAT 6002C26BB0, 06B0 (r1 SGI SRATSN2 10001 1)
    ACPI: SLIT 6002C27270, 012C (r1 SGI SLITSN2 10001 1)
    ACPI: FACP 6002C27400, 00F4 (r3 SGI FACPSN2 30001 1)
    ACPI: DSDT 6002C2AAF0, 0024 (r2 SGI DSDTSN2 20001 AAC)
    ACPI: FACS 6002C273B0, 0040
    Number of logical nodes in system = 16
    Number of memory chunks in system = 16
    SAL 3.2: SGI SN2 version 1.50
    SAL Platform features: ITC_Drift
    SAL: AP wakeup using external interrupt vector 0x12
    Unable to handle kernel NULL pointer dereference (address 00000000000044b8)
    swapper[0]: Oops 8813272891392 [1]
    Modules linked in:

    Pid: 0, CPU 0, comm: swapper
    psr : 00001010084a2010 ifs : 8000000000000491 ip : [<a000000100087020>] Not tainted (2.6.26-rc5-00223-g3463a93)
    ip is at sn2_send_IPI+0x80/0x240
    unat: 0000000000000000 pfs : 0000000000000491 rsc : 0000000000000003
    rnat: 000000000000afc8 bsps: 000000000001003e pr : 65691ba55aa68599
    ldrs: 0000000000000000 ccv : 0000000000ff03ff fpsr: 0009804c8a70433f
    csd : 0000000000000000 ssd : 0000000000000000
    b0 : a000000100942870 b6 : 00000000ff5423b0 b7 : e000000001fffc00
    f6 : 1003e0000000000000000 f7 : 1003e0000000000000001
    f8 : 1003e0000000000000000 f9 : 1003e0000000000000000
    f10 : 100068fffffffff700000 f11 : 1003e0000000000000090
    r1 : a000000100e8bd10 r2 : 00000000000044b8 r3 : 0000000000000000
    r8 : 0000000000000000 r9 : 0000000000000000 r10 : ffffffffffff6298
    r11 : 0000000000000000 r12 : a000000100adfc30 r13 : a000000100ad0000
    r14 : 0000000000000000 r15 : e000006003106298 r16 : e000006003110000
    r17 : a000000100d0dce8 r18 : a000000100d0dce8 r19 : a000000100d0dce8
    r20 : 0000000000000000 r21 : ffffffffffff0420 r22 : 0000000000000800
    r23 : 0000000000000007 r24 : e0000060030b0000 r25 : 000000000004ffff
    r26 : a00000010097c460 r27 : e0000060030b0010 r28 : e0000060030b0000
    r29 : e0000060030b0020 r30 : 0000000000000000 r31 : 00000000000007ff
    Unable to handle kernel NULL pointer dereference (address 0000000000000000)
    swapper[0]: Oops 8813272891392 [2]
    Modules linked in:

    Pid: 0, CPU 0, comm: swapper
    psr : 0000101008022018 ifs : 800000000000038c ip : [<a000000100175b30>] Not tainted (2.6.26-rc5-00223-g3463a93)
    ip is at kmem_cache_alloc+0x70/0x180
    unat: 0000000000000000 pfs : 0000000000000610 rsc : 0000000000000003
    rnat: 0000000000000000 bsps: 0000000000000000 pr : 65691ba55aa69aa5
    ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70033f
    csd : 0000000000000000 ssd : 0000000000000000
    b0 : a000000100040bc0 b6 : a000000100040e00 b7 : a00000010000b730
    f6 : 1003e45b3373c16c02344 f7 : 1003e9e3779b97f4a7c16
    f8 : 1003e0a00000010001426 f9 : 10006c7fffffffd73ea5c
    f10 : 100068fffffffff700000 f11 : 1003e0000000000000090
    r1 : a000000100e8bd10 r2 : a000000100bae950 r3 : a000000100bac860
    r8 : 0000000000000000 r9 : 0000000000000000 r10 : a000000100ad0c54
    r11 : 0000000000000000 r12 : a000000100adf100 r13 : a000000100ad0000
    r14 : 0000000000000014 r15 : a000000100adf190 r16 : a000000100adf198
    r17 : a000000100ca1480 r18 : a000000100adf17c r19 : a000000100adf170
    r20 : 0000000000000000 r21 : 0000000000000000 r22 : a000000100adf170
    r23 : a000000100adf174 r24 : 000000000000000c r25 : a000000100adf180
    r26 : a000000100adf174 r27 : 0000000000000000 r28 : 0000000000000000
    r29 : a000000100adf178 r30 : 000000007fffffff r31 : 000000000000000c



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