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    SubjectRe: [BUG] 2.6.25-rc2-git4 - Regression Kernel oops while running kernbench and tbench on powerpc
    Paul Mackerras wrote:
    > Kamalesh Babulal writes:
    >
    >> The kernel oops after applying the patch. Some time it takes more than
    >> one run to reproduce it, it was reproducible in the second run this
    >> time.
    >>
    >> Unrecoverable exception 4100 at c000000000008c8c
    >> Oops: Unrecoverable exception, sig: 6 [#1]
    >> SMP NR_CPUS=128 NUMA pSeries
    >> Modules linked in:
    >> NIP: c000000000008c8c LR: 000000000ff0135c CTR: 000000000ff012f0
    >> REGS: c000000772343bb0 TRAP: 4100 Not tainted (2.6.25-rc8-autotest)
    >> MSR: 8000000000001030 <ME,IR,DR> CR: 44044228 XER: 00000000
    >> TASK = c00000077cfa0900[13437] 'cc1' THREAD: c000000772340000 CPU: 2
    >> GPR00: 0000000000004000 c000000772343e30 00000000000000bb 000000000000d032
    >> GPR04: 00000000000000bb 0000000000000400 000000000000000a 0000000000000002
    >> GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
    >> GPR12: 0000000000000000 c000000000734000 0000000000000064 00000000ffe6df08
    >> GPR16: 00000000105b0000 00000000105b0000 0000000010440000 00000000105b0000
    >> GPR20: 00000000ffe6e008 00000000105b0000 00000000105b0000 000000000000000a
    >> GPR24: 000000000ffec408 0000000000000001 00000000ffe6ddca 0000000000000400
    >> GPR28: 000000000ffec408 00000000f7ff8000 000000000ffebff4 0000000000000400
    >> NIP [c000000000008c8c] restore+0x8c/0xc0
    >> LR [000000000ff0135c] 0xff0135c
    >> Call Trace:
    >> [c000000772343e30] [c000000000008cd4] do_work+0x14/0x2c (unreliable)
    >> Instruction dump:
    >> 7c840078 7c810164 70604000 41820028 60000000 7c4c42e6 e88d01f0 f84d01f0
    >> 7c841050 e84d01e8 7c422214 f84d01e8 <e9a100d8> 7c7b03a6 e84101a0 7c4ff120
    >
    > That looks like the bug that was supposed to be fixed by commit
    > 44387e9ff25267c78a99229aca55ed750e9174c7, which is in 2.6.25-rc7 and
    > later.
    >
    > What was the SHA1 ID of the head commit for the kernel source that
    > gave you this oops? Did you have any other patches besides the one I
    > sent you applied?
    >
    > Paul.

    The SHA1 ID of the kernel is 0e81a8ae37687845f7cdfa2adce14ea6a5f1dd34 (2.6.25-rc8)
    and the source seems to have the patch 44387e9ff25267c78a99229aca55ed750e9174c7.

    The kernel was patched only the patch you gave me (http://lkml.org/lkml/2008/4/8/42).

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


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