Unable to handle kernel NULL pointer dereference at virtual address

[Ratz <ratz@xxxxxx>]

Hi Wensong, 

Since several days I get those kernel messages running ipvs-0.9.9 patch
on kernel 2.2.14.
It seems to have no impact on the functionality of the service itself,
so I think my test
machine is somewhat f*ed up. Here's the message:

IP_VS: WRR scheduling module loaded.
.
.
-> After hours
.
.
Unable to handle kernel NULL pointer dereference at virtual address
0000002b
current->tss.cr3 = 025e7000, %cr3 = 025e7000
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<0000002b>]
EFLAGS: 00010282
eax: fffffff7   ebx: 8211a000   ecx: 0000002b   edx: 2ac56b74
esi: 00000002   edi: 00000008   ebp: 7fffe788   esp: 8211bfec
ds: 0018   es: 0018   ss: 0018
Process standard (pid: 11422, process nr: 49, stackpage=8211b000)
Stack: 2ac56b74 00000023 00000246 7fffe75c 0000002b 
Call Trace: 
Code: <1>Unable to handle kernel NULL pointer dereference at virtual
address 000
0002b
current->tss.cr3 = 025e7000, %cr3 = 025e7000
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<80109391>]
EFLAGS: 00010046
eax: 00000000   ebx: 00000000   ecx: 0000002b   edx: 832b0000
esi: 0000002b   edi: 8211c000   ebp: 84800000   esp: 8211bf2c
ds: 0018   es: 0018   ss: 0018
Process standard (pid: 11422, process nr: 49, stackpage=8211b000)
Stack: 0000002b 08048000 801e7d4e 00000002 00000008 7fffe788 fffffff7
8211a000 
       0000002b 2ac56b74 0000002b 00010282 04000000 85000000 801093f4
8211bfb0 
       801a2458 801a3b2e 00000000 00000000 8010e410 801a3b2e 8211bfb0
00000000 
Call Trace: [<85000000>] [<801093f4>] [<801a2458>] [<801a3b2e>]
[<8010e410>] [<8
01a3b2e>] [<80109035>] 
Code: 8a 04 0b 89 44 24 38 50 68 50 24 1a 80 e8 cd 9b 00 00 83 c4 
IP_VS: WRR scheduling module unloaded.
IP_VS: WRR scheduling module loaded.
IP_VS: WRR scheduling module unloaded.
IP_VS: vs_ctl: invalid protocol: 00.0.0.0:0 

As a more detailed investigation with the map file showed, this seems to
be 
happening also on other processes, no only when deleting a template. A
check
back reveiled dumps for bash, sh, watch, so I'd suggest my machine is
has
a little problem (memory?). The strange point is, however, that it runs 
very stable for days now. 

If somebody out there experienced the same problem, I'd like to know,
this 
could help me tracking down this occurency.

Thanks,

Roberto Nibali, ratz