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    SubjectOops running oprofile in 2.5.62
    This happened while running dbench on 2.5.62.  I haven't seen it before,
    but I thought I'd report it anyway. I'm using the 0.5 version of the
    userspace tools.

    I'm pretty sure it happened on this line in oprofile_add_sample():
    cpu_buf->buffer[cpu_buf->pos].eip = eip;

    Unable to handle kernel paging request at virtual address f8c3c000
    c0212022
    *pde = 00000000
    Oops: 0002
    CPU: 13
    EIP: 0060:[<c0212022>] Not tainted
    Using defaults from ksymoops -t elf32-i386 -a i386
    EFLAGS: 00010046
    eax: 40082d94 ebx: 00000340 ecx: 00002000 edx: f8c2c000
    esi: 00000000 edi: c0310f00 ebp: 00000000 esp: e2fbdf60
    ds: 007b es: 007b ss: 0068
    Stack: 00000000 00000000 c03a22c8 c02139f0 40082d94 00000000 00000000
    0000000d e2fbc000 e2fbdfc4 bffff7a0 bffffbb8 40082d94 c0213291
    0000000d c03a22c8 e2fbdfc4 c010a1eb e2fbdfc4 0000000d 40122020
    00000000 c010962e e2fbdfc4
    Call Trace:
    [<c02139f0>] ppro_check_ctrs+0x4c/0x80
    [<c0213291>] nmi_callback+0x21/0x28
    [<c010a1eb>] do_nmi+0x2b/0x48
    [<c010962e>] nmi+0x1e/0x30
    Code: 89 04 ca 8b 8b c4 0b 31 c0 8b 93 d0 0b 31 c0 8b 44 24 18 89
    p

    >>EIP; c0212022 <oprofile_add_sample+102/128> <=====

    >>edi; c0310f00 <cpu_buffer+340/800>

    Trace; c02139f0 <ppro_check_ctrs+4c/80>
    Trace; c0213291 <nmi_callback+21/28>
    Trace; c010a1eb <do_nmi+2b/48>
    Trace; c010962e <nmi+1e/30>

    Code; c0212022 <oprofile_add_sample+102/128>
    00000000 <_EIP>:
    Code; c0212022 <oprofile_add_sample+102/128> <=====
    0: 89 04 ca mov %eax,(%edx,%ecx,8) <=====
    Code; c0212025 <oprofile_add_sample+105/128>
    3: 8b 8b c4 0b 31 c0 mov 0xc0310bc4(%ebx),%ecx
    Code; c021202b <oprofile_add_sample+10b/128>
    9: 8b 93 d0 0b 31 c0 mov 0xc0310bd0(%ebx),%edx
    Code; c0212031 <oprofile_add_sample+111/128>
    f: 8b 44 24 18 mov 0x18(%esp,1),%eax
    Code; c0212035 <oprofile_add_sample+115/128>
    13: 89 00 mov %eax,(%eax)



    --
    Dave Hansen
    haveblue@us.ibm.com

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