From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux 2.4.2-2 i686; en-US; rv:0.8.1+)
Gecko/20010430

Description of problem:
We have a Pentium II (Klamath) oopsing (sometimes crashing the machine)
with the following oops (standard i686 kernel):

Unable to handle kernel paging request at virtual address 840fc084
 printing eip:
c0147af7
pgd entry c6d3e840: 0000000000000000
pmd entry c6d3e840: 0000000000000000
... pmd not present!
Oops: 0002
CPU:    0
EIP:    0010:[<c0147af7>]
EFLAGS: 00010246
eax: 00000000   ebx: c36a2bc0   ecx: c36a2bd0   edx: c36a2bd0
esi: c0268f20   edi: c36a2bc0   ebp: c51bb960   esp: c6cd1f40
ds: 0018   es: 0018   ss: 0018
Process ypbind (pid: 575, stackpage=c6cd1000)
Stack: c6d5b060 00000000 c36a2cd0 c1230440 c51bb960 c36a2bc0 c0145a0d c36a2bc0 
       c36a2cd0 ffffffff c79b62c0 00000000 c79b62c0 c1230440 c0134531 c51bb960 
       c79b62c0 00000000 080500e0 41182a94 c0133603 c79b62c0 c7dce6c0 00000000 
Call Trace: [<c0145a0d>] [<c0134531>] [<c0133603>] [<c0133653>]
[<c010901b>] [<c010002b>] 

Code: 0f 94 80 84 c0 0f 84 0d 01 00 00 66 83 7b 2c 00 0f 85 93 00 

We've ran a memory tester (memtest86), and it reported no faults after
several hours. The machine worked for a long time with a 2.2.19 kernel with
no problems. Is this hardware or the kernel??


How reproducible:
Always

Steps to Reproduce:
1. Leave machine. Happens roughly every few hours
2.
3.
	

Additional info:

From ksymoops:

ksymoops 2.4.0 on i686 2.4.2-2.  Options used
     -v /boot/vmlinux-2.4.2-2 (specified)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.4.2-2/ (default)
     -m /boot/System.map-2.4.2-2 (default)

[...warnings...]

Unable to handle kernel paging request at virtual address 840fc084
c0147af7
Oops: 0002
CPU:    0
EIP:    0010:[<c0147af7>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000   ebx: c36a2bc0   ecx: c36a2bd0   edx: c36a2bd0
esi: c0268f20   edi: c36a2bc0   ebp: c51bb960   esp: c6cd1f40
ds: 0018   es: 0018   ss: 0018
Process ypbind (pid: 575, stackpage=c6cd1000)
Stack: c6d5b060 00000000 c36a2cd0 c1230440 c51bb960 c36a2bc0 c0145a0d c36a2bc0 
       c36a2cd0 ffffffff c79b62c0 00000000 c79b62c0 c1230440 c0134531 c51bb960 
       c79b62c0 00000000 080500e0 41182a94 c0133603 c79b62c0 c7dce6c0 00000000 
Call Trace: [<c0145a0d>] [<c0134531>] [<c0133603>] [<c0133653>]
[<c010901b>] [<c010002b>] 
Code: 0f 94 80 84 c0 0f 84 0d 01 00 00 66 83 7b 2c 00 0f 85 93 00 

>>EIP; c0147af7 <iput_free+37/160>   <=====
Trace; c0145a0d <dput+10d/180>
Trace; c0134531 <fput+71/d0>
Trace; c0133603 <filp_close+53/60>
Trace; c0133653 <sys_close+43/50>
Trace; c010901b <system_call+33/38>
Trace; c010002b <startup_32+2b/139>
Code;  c0147af7 <iput_free+37/160>
00000000 <_EIP>:
Code;  c0147af7 <iput_free+37/160>   <=====
   0:   0f 94 80 84 c0 0f 84      sete   0x840fc084(%eax)   <=====
Code;  c0147afe <iput_free+3e/160>
   7:   0d 01 00 00 66         or     $0x66000001,%eax
Code;  c0147b03 <iput_free+43/160>
   c:   83 7b 2c 00               cmpl   $0x0,0x2c(%ebx)
Code;  c0147b07 <iput_free+47/160>
  10:   0f 85 93 00 00 00         jne    a9 <_EIP+0xa9> c0147ba0
<iput_free+e0/160>


18 warnings and 4 errors issued.  Results may not be reliable.

pci:xpc6:/root> cat /proc/pci
PCI devices found:
  Bus  0, device   0, function  0:
    Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 2).
      Master Capable.  Latency=32.  
  Bus  0, device   7, function  0:
    ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] (rev 1).
  Bus  0, device   7, function  1:
    IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
(rev 0).
      Master Capable.  Latency=32.  
      I/O at 0xffa0 [0xffaf].
  Bus  0, device  15, function  0:
    Ethernet controller: Intel Corporation 82557 [Ethernet Pro 100] (rev 4).
      IRQ 10.
      Master Capable.  Latency=72.  Min Gnt=8.Max Lat=56.
      Prefetchable 32 bit memory at 0xfff7f000 [0xfff7ffff].
      I/O at 0xff80 [0xff9f].
      Non-prefetchable 32 bit memory at 0xffe00000 [0xffefffff].
  Bus  0, device  17, function  0:
    SCSI storage controller: Adaptec 7892A (rev 2).
      IRQ 10.
      Master Capable.  Latency=240.  Min Gnt=40.Max Lat=25.
      I/O at 0xfc00 [0xfcff].
      Non-prefetchable 64 bit memory at 0xffbeb000 [0xffbebfff].
  Bus  0, device  19, function  0:
    VGA compatible controller: Matrox Graphics, Inc. MGA 2164W [Millennium
II] (rev 0).
      IRQ 11.
      Master Capable.  Latency=32.  
      Prefetchable 32 bit memory at 0xfb000000 [0xfbffffff].
      Non-prefetchable 32 bit memory at 0xffbec000 [0xffbeffff].
      Non-prefetchable 32 bit memory at 0xff000000 [0xff7fffff].

/proc/meminfo:

        total:    used:    free:  shared: buffers:  cached:
Mem:  129748992 126480384  3268608        0  3276800 51159040
Swap: 1085718528  3309568 1082408960
MemTotal:       126708 kB
MemFree:          3192 kB
MemShared:           0 kB
Buffers:          3200 kB
Cached:          49960 kB
Active:          47276 kB
Inact_dirty:      3712 kB
Inact_clean:      2172 kB
Inact_target:      596 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       126708 kB
LowFree:          3192 kB
SwapTotal:     1060272 kB
SwapFree:      1057040 kB