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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
*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

>>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

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