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SubjectKernel-2.4.13/ac-6 & ucd-snmp oops
Date
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Hello,

I'm currently running RedHat 7.2 on a Dell PowerEdge 2550 with 2 x
PIII1000 and 512MB RAM together with an onboard RAID controller that
requires the AACRAID patch before the kernel can detect the controller.

Apparently all is working fine except that occasionally, especially
after running for more than 24hrs, the snmpd daemon will cause a kernel
oops and die. I can then restart the snmpd daemon and it will run for
more than 24hrs and then die again with a kernel oops.

The snmp dies randomly without a fixed pattern other than the
accompanying kernel oops as well as it runs generally fine for more than
24hrs.

The ucd-snmp is verion 4.2.1 that comes with RedHat 7.2 SRPM. I rebuilt
the ucd-snmp package from the SRPM as the stock ucd-snmp RPM cannot seem
to work properly with the "disk" parameter as it causes the snmpd to die
upon startup. A direct recompilation without any changes from the source
RPM solved the problem.

I have tried out kernel-2.4.13 as well as kernel 2.4.13-ac6 and the oops
still occurs.

The following is the oops message followed by the ksymoops output as
mentioned in the oops-tracing.txt file.

OOPS Message
============
Unable to handle kernel NULL pointer dereference at virtual address
000002de
printing eip: c01f8ec6
*pde = 00000000
Oops: 0000
CPU: 1
EIP: 0010:[sprintf_stats+38/192] Not tainted
EIP: 0010:[<c01f8ec6>] Not tainted
EFLAGS: 00010202
eax: 00000286 ebx: dfe06000 ecx: 00000000 edx: 00000286
esi: c1f041c0 edi: 00000000 ebp: 00000000 esp: de7ebf24
ds: 0018 es: 0018 ss: 0018
Process snmpd (pid: 842, stackpage=de7eb000)
Stack: 000001c0 dfe06000 c01f8fb4 c1f041c0 dfe06000 00000000 00000c00
00001000
c1f04000 c0155d64 c1f04000 de7ebf68 00000000 00000c00 c18ce5a0
00000000
00000000 00000000 dc482960 ffffffea 00000000 00001000 c0135146
dc482960
Call Trace: [dev_get_info+84/160] [proc_file_read+148/400]
[sys_read+150/208] [system_call+51/56]

Call Trace: [<c01f8fb4>] [<c0155d64>] [<c0135146>] [<c0106f1b>]

Code: 8b 42 58 50 8b 4a 44 8b 42 40 01 c8 8b 4a 50 01 c8 8b 4a 4c


KSYMOOPS OUTPUT
===============
ksymoops 2.4.1 on i686 2.4.13-ac6. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.13-ac6/ (default)
-m /boot/System.map (specified)

Unable to handle kernel NULL pointer dereference at virtual address
000002de
*pde = 00000000
Oops: 0000
CPU: 1
EIP: 0010:[sprintf_stats+38/192] Not tainted
EIP: 0010:[<c01f8ec6>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010202
eax: 00000286 ebx: dfe06000 ecx: 00000000 edx: 00000286
esi: c1f041c0 edi: 00000000 ebp: 00000000 esp: de7ebf24
ds: 0018 es: 0018 ss: 0018
Process snmpd (pid: 842, stackpage=de7eb000)
Stack: 000001c0 dfe06000 c01f8fb4 c1f041c0 dfe06000 00000000 00000c00
00001000
c1f04000 c0155d64 c1f04000 de7ebf68 00000000 00000c00 c18ce5a0
00000000
00000000 00000000 dc482960 ffffffea 00000000 00001000 c0135146
dc482960
Call Trace: [dev_get_info+84/160] [proc_file_read+148/400]
[sys_read+150/208] [system_call+51/56]
Call Trace: [<c01f8fb4>] [<c0155d64>] [<c0135146>] [<c0106f1b>]
Code: 8b 42 58 50 8b 4a 44 8b 42 40 01 c8 8b 4a 50 01 c8 8b 4a 4c

>>EIP; c01f8ec6 <sprintf_stats+26/c0> <=====
Trace; c01f8fb4 <dev_get_info+54/a0>
Trace; c0155d64 <proc_file_read+94/190>
Trace; c0135146 <sys_read+96/d0>
Trace; c0106f1b <system_call+33/38>
Code; c01f8ec6 <sprintf_stats+26/c0>
00000000 <_EIP>:
Code; c01f8ec6 <sprintf_stats+26/c0> <=====
0: 8b 42 58 mov 0x58(%edx),%eax <=====
Code; c01f8ec9 <sprintf_stats+29/c0>
3: 50 push %eax
Code; c01f8eca <sprintf_stats+2a/c0>
4: 8b 4a 44 mov 0x44(%edx),%ecx
Code; c01f8ecd <sprintf_stats+2d/c0>
7: 8b 42 40 mov 0x40(%edx),%eax
Code; c01f8ed0 <sprintf_stats+30/c0>
a: 01 c8 add %ecx,%eax
Code; c01f8ed2 <sprintf_stats+32/c0>
c: 8b 4a 50 mov 0x50(%edx),%ecx
Code; c01f8ed5 <sprintf_stats+35/c0>
f: 01 c8 add %ecx,%eax
Code; c01f8ed7 <sprintf_stats+37/c0>
11: 8b 4a 4c mov 0x4c(%edx),%ecx


Does anyone have any idea what could be causing the problem?

Many thanks in advance for any help.
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