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    Subject[BUG] 2.6.25-rc2-git4 - Regression Kernel oops while running kernbench and tbench on powerpc
    Hi,

    The Kernel oopses is seen while running the kernbench followed by tbench with 2.6.25-rc2-git4
    kernel on powerpc, this oops was reported for the 2.6.24-rc8-mm1 kernel (http://lkml.org/lkml/2008/1/18/71)
    and is visible with almost all of the main line ,rc(s) and their git(s) release from then.

    This oops is visible in the linux-next-20080220 kernel also.The machine is power4+ box with four cpus and
    has 30 GB RAM.

    oops while running kernbench
    -----------------------------

    Oops: Kernel access of bad area, sig: 11 [#1]
    SMP NR_CPUS=32 NUMA pSeries
    Modules linked in:
    NIP: 0000000000004570 LR: 000000000ff0135c CTR: 000000000ff012f0
    REGS: c000000771a678c0 TRAP: 0300 Not tainted (2.6.25-rc2-autotest-next-20080220)
    MSR: 8000000000001000 <ME> CR: 28000282 XER: 00000000
    DAR: c000000771a67ce0, DSISR: 000000000a000000
    TASK = c00000077b9d2c00[22046] 'cc1' THREAD: c000000771a64000 CPU: 3
    GPR00: 0000000000004000 c000000771a67b40 0000000000000052 000000000000d032
    GPR04: 0000000000000052 0000000000000400 00000000106823e0 000000000000000e
    GPR08: 0000000000000000 0000000044000288 c000000771a67e30 0000998be2321500
    GPR12: 8000000000001030 c0000000005d7e00 0000000010030000 0000000010030000
    GPR16: 00000000105b0000 00000000105b0000 0000000010440000 00000000105b0000
    GPR20: 00000000105b0000 00000000105b0000 00000000105b0000 00000000105b0000
    GPR24: 00000000105b41e8 0000000000000020 00000000105b0000 0000000000000400
    GPR28: 000000000ffec408 00000000f7ff8000 000000000ffebff4 0000000000000400
    NIP [0000000000004570] 0x4570
    LR [000000000ff0135c] 0xff0135c
    Call Trace:
    [c000000771a67b40] [c00000000062d558] 0xc00000000062d558 (unreliable)
    [c000000771a67e08] [00000000f7ff8000] 0xf7ff8000
    Instruction dump:
    48000000 XXXXXXXX XXXXXXXX XXXXXXXX 41820008 XXXXXXXX XXXXXXXX XXXXXXXX
    48000010 XXXXXXXX XXXXXXXX XXXXXXXX f92101a0 XXXXXXXX XXXXXXXX XXXXXXXX
    ---[ end trace 26a7439b76b3cbab ]---

    oops while running tbench
    --------------------------

    Unable to handle kernel paging request for data at address 0xc00000077e2e3ce0
    Faulting instruction address: 0x00004570
    Oops: Kernel access of bad area, sig: 11 [#2]
    SMP NR_CPUS=32 NUMA pSeries
    Modules linked in:
    NIP: 0000000000004570 LR: c00000000000872c CTR: 0000000000000000
    REGS: c00000077e2e38c0 TRAP: 0300 Tainted: G D (2.6.25-rc2-autotest-next-20080220)
    MSR: 8000000000001000 <ME> CR: 28022822 XER: 20000000
    DAR: c00000077e2e3ce0, DSISR: 000000000a000000
    TASK = c00000077cb55800[3900] 'zmd' THREAD: c00000077e2e0000 CPU: 3
    GPR00: 0000000000000000 c00000077e2e3b40 c0000000006a29b8 000000000000006e
    GPR04: 000000000fe7bac8 0000000054022888 0000000000004000 000000000fe7bae4
    GPR08: 000000000000d032 0000000044022824 c00000077e2e3e30 0000998be2321500
    GPR12: 8000000000001030 c0000000005d7e00 0000000000000001 0000000000000000
    GPR16: 0000000000000000 00000000f7c16708 00000000f7fa0800 00000000100e0040
    GPR20: 00000000f7ffe018 0000000000000001 00000000f5397550 00000000f5397548
    GPR24: 0000000000000000 0000000000004a19 00000000f7d66474 00000000f53975a8
    GPR28: 0000000000000000 0000000000009433 000000000fe94ff4 00000000f7d66490
    NIP [0000000000004570] 0x4570
    LR [c00000000000872c] syscall_exit+0x0/0x40
    Call Trace:
    [c00000077e2e3b40] [00000496000729b8] 0x496000729b8 (unreliable)
    Instruction dump:
    48000000 XXXXXXXX XXXXXXXX XXXXXXXX 41820008 XXXXXXXX XXXXXXXX XXXXXXXX
    48000010 XXXXXXXX XXXXXXXX XXXXXXXX f92101a0 XXXXXXXX XXXXXXXX XXXXXXXX

    The machine
    --
    Thanks & Regards,
    Kamalesh Babulal,
    Linux Technology Center,
    IBM, ISTL.


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