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SubjectKernel Oops. Possible motherboard problem
Hi,

I have been having trouble with a server crashing for the last few months. The machine seems to run fine for a few days and then unexpectedly crashes or locks up. I have tried numerous things to resolve the problem. At first the issue appeared memory related so I swapped the memory. Still crashed. I have also added another hard drive. Based on the kernel opuses I had been checking the programs that own the processes that crash, however, I also read somewhere that software can not cause Kernel panics or Kernel oopses. I read that only a kernel bug or a hardware problem can cause the oops. As a result, I upgraded the kernel and the machine ran fine for 5 days and then crashed. I think I have a decent amount of experience, however I have not had to trouble shoot an issue like this before. I have run the latest oopses through ksymoops. I would appreciate some help in understanding what they mean and what the actual problem might be. Here are the messages

ksymoops 0.7c on i686 2.2.16-3. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.2.16-3/ (default)
-m /usr/src/linux/System.map (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

Dec 4 23:08:31 ws1 kernel: Unable to handle kernel paging request at virtual address 91d1bfc8
Dec 4 23:08:31 ws1 kernel: current->tss.cr3 = 00101000, %cr3 = 00101000
Dec 4 23:08:31 ws1 kernel: *pde = 00000000
Dec 4 23:08:31 ws1 kernel: Oops: 0000
Dec 4 23:08:31 ws1 kernel: CPU: 0
Dec 4 23:08:31 ws1 kernel: EIP: 0010:[kmem_cache_free+64/372]
Dec 4 23:08:31 ws1 kernel: EFLAGS: 00010086
Dec 4 23:08:31 ws1 kernel: eax: 0000005c ebx: d1d1b8a0 ecx: 91d1bfc0 edx: d1d1b8fc
Dec 4 23:08:31 ws1 kernel: esi: dff94740 edi: 00000286 ebp: c052f668 esp: dfeebf70
Dec 4 23:08:31 ws1 kernel: ds: 0018 es: 0018 ss: 0018
Dec 4 23:08:31 ws1 kernel: Process kswapd (pid: 5, process nr: 5, stackpage=dfeeb000)
Dec 4 23:08:31 ws1 kernel: Stack: d1d1b8a0 c052f668 d1d1b8fc c0232000 c0127b1d dff94740 d1d1b8a0 d1d1b8a0
Dec 4 23:08:31 ws1 kernel: d1d1b8a0 c0128883 d1d1b8a0 d1d1b8a0 c052f668 000007f6 00000030 00001000
Dec 4 23:08:31 ws1 kernel: c011d4f6 c052f668 00000010 00000006 00000030 c0122272 00000006 00000030
Dec 4 23:08:31 ws1 kernel: Call Trace: [put_unused_buffer_head+33/76] [try_to_free_buffers+75/136] [shrink_mmap+238/324] [do_try_to_free_pages+38/120] [tvecs+7374/13920] [kswapd+115/180] [get_options+0/116]
Dec 4 23:08:31 ws1 kernel: Code: 8b 69 08 81 fd 2b 2f c3 a5 0f 85 d9 00 00 00 8b 69 0c 85 ed
Using defaults from ksymoops -t elf32-i386 -a i386

Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: 8b 69 08 mov 0x8(%ecx),%ebp
Code; 00000003 Before first symbol
3: 81 fd 2b 2f c3 a5 cmp $0xa5c32f2b,%ebp
Code; 00000009 Before first symbol
9: 0f 85 d9 00 00 00 jne e8 <_EIP+0xe8> 000000e8 Before first symbol
Code; 0000000f Before first symbol
f: 8b 69 0c mov 0xc(%ecx),%ebp
Code; 00000012 Before first symbol
12: 85 ed test %ebp,%ebp


1 warning issued. Results may not be reliable.



ksymoops 0.7c on i686 2.2.16-3. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.2.16-3/ (default)
-m /usr/src/linux/System.map (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

Dec 4 23:09:45 ws1 kernel: Unable to handle kernel paging request at virtual address 91d1b854
Dec 4 23:09:45 ws1 kernel: current->tss.cr3 = 01025000, %cr3 = 01025000
Dec 4 23:09:45 ws1 kernel: *pde = 00000000
Dec 4 23:09:45 ws1 kernel: Oops: 0000
Dec 4 23:09:45 ws1 kernel: CPU: 0
Dec 4 23:09:45 ws1 kernel: EIP: 0010:[try_to_free_buffers+18/136]
Dec 4 23:09:45 ws1 kernel: EFLAGS: 00010287
Dec 4 23:09:45 ws1 kernel: eax: 91d1b840 ebx: c052cf08 ecx: 00000013 edx: 00040000
Dec 4 23:09:45 ws1 kernel: esi: 91d1b840 edi: d1d1b840 ebp: c052cf08 esp: c269fe9c
Dec 4 23:09:45 ws1 kernel: ds: 0018 es: 0018 ss: 0018
Dec 4 23:09:45 ws1 kernel: Process opbs (pid: 24222, process nr: 94, stackpage=c269f000)
Dec 4 23:09:45 ws1 kernel: Stack: 00000013 0097c000 c011d4f6 c052cf08 0000001c 00000006 00000013 c0122272
Dec 4 23:09:45 ws1 kernel: 00000006 00000013 00000001 00000013 00000013 c01223a0 00000013 c269e000
Dec 4 23:09:45 ws1 kernel: df3b4aa0 c0122bb8 00000013 00961000 df3b4aa0 00000000 0097c000 c052ccd8
Dec 4 23:09:45 ws1 kernel: Call Trace: [shrink_mmap+238/324] [do_try_to_free_pages+38/120] [try_to_free_pages+40/52] [__get_free_pages+180/1020] [try_to_read_ahead+47/276] [do_generic_file_read+750/1508] [generic_file_read+99/124]
Dec 4 23:09:46 ws1 kernel: Code: 8b 76 14 83 78 20 00 75 06 f6 40 18 46 74 0f 6a 00 e8 70 01
Using defaults from ksymoops -t elf32-i386 -a i386

Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: 8b 76 14 mov 0x14(%esi),%esi
Code; 00000003 Before first symbol
3: 83 78 20 00 cmpl $0x0,0x20(%eax)
Code; 00000007 Before first symbol
7: 75 06 jne f <_EIP+0xf> 0000000f Before first symbol
Code; 00000009 Before first symbol
9: f6 40 18 46 testb $0x46,0x18(%eax)
Code; 0000000d Before first symbol
d: 74 0f je 1e <_EIP+0x1e> 0000001e Before first symbol
Code; 0000000f Before first symbol
f: 6a 00 push $0x0
Code; 00000011 Before first symbol
11: e8 70 01 00 00 call 186 <_EIP+0x186> 00000186 Before first symbol


1 warning issued. Results may not be reliable.


Any help or assistance would be greatly appreciated. Please cc pmarshal@protelligence.com when replying.

Thanks.

Paul Marshall
Paul Marshall -- President, CEO
Protelligence
Internet Consulting and Marketing
http://www.protelligence.com 415-482-0700

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