I built a raid5 nfs server out of an old pentium 200 mmx, and one of the
drives was having issues:
hdc: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hdc: dma_intr: error=0x84 { DriveStatusError BadCRC }
so I was messing with the cabling and rechecking to see if I was still
getting the errors. The easiest way to reproduce the errors was running
"cat /dev/hdc > /dev/null", and while that was going on I ran "vmstat 2"
out of curiousity. While that was going on, I got the oops included
below.
The machine is a Pentium MMX 200 with 64M of ram, running a completely
vanilla 2.4.22-rc1 compiled with gcc 3.3.1 (yesterday's debian unstable
gcc-3.3 1:3.3.1-1 package).
Is there any reason to think I might be getting an oops in what looks
like core vm code? I'm running memtest86 on the machine now, but
overheating isn't normally an issue on old machines like this.
Jason
ksymoops 2.4.8 on i586 2.4.22-rc1. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.22-rc1/ (default)
-m /boot/System.map-2.4.22-rc1 (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.
Unable to handle kernel NULL pointer dereference at virtual address 00000824
c0136b56
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c0136b56>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010206
eax: 00000000 ebx: 00000000 ecx: 00000800 edx: 00000000
esi: c3771380 edi: c3771380 ebp: c10766dc esp: c3fa1f2c
ds: 0018 es: 0018 ss: 0018
Process kswapd (pid: 4, stackpage=c3fa1000)
Stack: c3771320 c3771380
Call Trace: [<c01394bd>] [<c012e460>] [<c012e650>] [<c012e6b0>] [<c012e7c0>]
[<c012e826>] [<c012e940>] [<c0105000>] [<c0105673>] [<c012e8b0>]
Code: 89 51 24 81 e3 ff ff 00 00 89 4a 20 39 34 9d b0 94 30 c0 74
>>EIP; c0136b56 <__remove_from_lru_list+16/80> <=====
>>esi; c3771380 <_end+3441c54/450d934>
>>edi; c3771380 <_end+3441c54/450d934>
>>ebp; c10766dc <_end+d46fb0/450d934>
>>esp; c3fa1f2c <_end+3c72800/450d934>
Trace; c01394bd <try_to_free_buffers+4d/e0>
Trace; c012e460 <shrink_cache+240/2f0>
Trace; c012e650 <shrink_caches+50/80>
Trace; c012e6b0 <try_to_free_pages_zone+30/50>
Trace; c012e7c0 <kswapd_balance_pgdat+50/a0>
Trace; c012e826 <kswapd_balance+16/30>
Trace; c012e940 <kswapd+90/c0>
Trace; c0105000 <_stext+0/0>
Trace; c0105673 <arch_kernel_thread+23/30>
Trace; c012e8b0 <kswapd+0/c0>
Code; c0136b56 <__remove_from_lru_list+16/80>
00000000 <_EIP>:
Code; c0136b56 <__remove_from_lru_list+16/80> <=====
0: 89 51 24 mov %edx,0x24(%ecx) <=====
Code; c0136b59 <__remove_from_lru_list+19/80>
3: 81 e3 ff ff 00 00 and $0xffff,%ebx
Code; c0136b5f <__remove_from_lru_list+1f/80>
9: 89 4a 20 mov %ecx,0x20(%edx)
Code; c0136b62 <__remove_from_lru_list+22/80>
c: 39 34 9d b0 94 30 c0 cmp %esi,0xc03094b0(,%ebx,4)
Code; c0136b69 <__remove_from_lru_list+29/80>
13: 74 00 je 15 <_EIP+0x15>
1 warning issued. Results may not be reliable.
Jason Lunz <[email protected]> wrote:
>
> I built a raid5 nfs server out of an old pentium 200 mmx
>
> ...
>
> Unable to handle kernel NULL pointer dereference at virtual address 00000824
> c0136b56
> *pde = 00000000
> Oops: 0002
> CPU: 0
> EIP: 0010:[<c0136b56>] Not tainted
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010206
> eax: 00000000 ebx: 00000000 ecx: 00000800 edx: 00000000
^ single bit error.
It's time to treat yourself to a new computer.