i think this i a kernel bug

root@cs:/var/swaret# cat /proc/version
Linux version 2.4.22 (root@cs) (gcc version 3.2.3) #3 Sat Oct 25 13:58:37 EEST 2003

syslog msg:

Oct 25 17:10:06 cs kernel: LIST_DELETE: ip_conntrack_core.c:301 `&ct->tuplehash[IP_CT_DIR_REPLY]'(de7be444) not in &ip_conntrack_hash [hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple)].
Oct 25 17:10:53 cs kernel: LIST_DELETE: ip_conntrack_core.c:301 `&ct->tuplehash[IP_CT_DIR_REPLY]'(de7bebc4) not in &ip_conntrack_hash [hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple)].
Oct 25 17:25:00 cs kernel: LIST_DELETE: ip_conntrack_core.c:301 `&ct->tuplehash[IP_CT_DIR_REPLY]'(de7bee44) not in &ip_conntrack_hash [hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple)].
Oct 25 17:25:00 cs kernel: LIST_DELETE: ip_conntrack_core.c:301 `&ct->tuplehash[IP_CT_DIR_REPLY]'(de8230a4) not in &ip_conntrack_hash [hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple)].
Oct 25 17:25:00 cs kernel: LIST_DELETE: ip_conntrack_core.c:301 `&ct->tuplehash[IP_CT_DIR_REPLY]'(de8231e4) not in &ip_conntrack_hash [hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple)].
Oct 25 17:25:00 cs kernel: LIST_DELETE: ip_conntrack_core.c:301 `&ct->tuplehash[IP_CT_DIR_REPLY]'(de823324) not in &ip_conntrack_hash [hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple)].
Oct 25 17:25:00 cs kernel: LIST_DELETE: ip_conntrack_core.c:301 `&ct->tuplehash[IP_CT_DIR_REPLY]'(de823464) not in &ip_conntrack_hash [hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple)].

notes:

i can not show you /proc/modules because the box just hangs up after some time and i can't get that information.

root@cs:/var/swaret# iptables -V
iptables v1.2.6a

root@cs:/var/swaret# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 8
model name      : Pentium III (Coppermine)
stepping        : 10
cpu MHz         : 996.783
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips        : 1985.74

root@cs:/var/swaret# cat /proc/ioports
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
0376-0376 : ide1
03c0-03df : vga+
03f6-03f6 : ide0
0cf8-0cff : PCI conf1
d400-d4ff : Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
  d400-d4ff : 8139too
d800-d8ff : Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (#2)
  d800-d8ff : 8139too
ef40-ef5f : Intel Corp. 82801BA/BAM USB (Hub #1)
ef80-ef9f : Intel Corp. 82801BA/BAM USB (Hub #2)
efa0-efaf : Intel Corp. 82801BA/BAM SMBus
ffa0-ffaf : Intel Corp. 82801BA IDE U100
  ffa0-ffa7 : ide0
  ffa8-ffaf : ide1

root@cs:/var/swaret# cat /proc/iomem
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-1febffff : System RAM
  00100000-0024e081 : Kernel code
  0024e082-002c75a3 : Kernel data
1fec0000-1fef7fff : ACPI Tables
1fef8000-1fefffff : ACPI Non-volatile Storage
f8000000-fbffffff : Intel Corp. 82810E DC-133 CGC [Chipset Graphics Controller]
ff8ff800-ff8ff8ff : Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
  ff8ff800-ff8ff8ff : 8139too
ff8ffc00-ff8ffcff : Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (#2)
  ff8ffc00-ff8ffcff : 8139too
ffa80000-ffafffff : Intel Corp. 82810E DC-133 CGC [Chipset Graphics Controller]
ffb80000-ffbfffff : reserved
fff00000-ffffffff : reserved

root@cs:/var/swaret# lspci -vv
00:00.0 Host bridge: Intel Corp. 82810E DC-133 GMCH [Graphics Memory Controller Hub] (rev 03)
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
        Latency: 0

00:01.0 VGA compatible controller: Intel Corp. 82810E DC-133 CGC [Chipset Graphics Controller] (rev 03) (prog-if 00 [VGA])
Subsystem: Intel Corp.: Unknown device 4333
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin A routed to IRQ 11
Region 0: Memory at f8000000 (32-bit, prefetchable) [size=64M]
Region 1: Memory at ffa80000 (32-bit, non-prefetchable) [size=512K]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB PCI Bridge (rev 02) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
I/O behind bridge: 0000d000-0000dfff
Memory behind bridge: ff800000-ff8fffff
Prefetchable memory behind bridge: f6a00000-f6afffff
BridgeCtl: Parity- SERR+ NoISA- VGA- MAbort- >Reset- FastB2B-

00:1f.0 ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 02)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0

00:1f.1 IDE interface: Intel Corp. 82801BA IDE U100 (rev 02) (prog-if 80 [Master])
Subsystem: Intel Corp.: Unknown device 4333
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Region 4: I/O ports at ffa0 [size=16]

00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #1) (rev 02) (prog-if 00 [UHCI])
Subsystem: Intel Corp.: Unknown device 4333
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin D routed to IRQ 5
Region 4: I/O ports at ef40 [size=32]

00:1f.3 SMBus: Intel Corp. 82801BA/BAM SMBus (rev 02)
Subsystem: Intel Corp.: Unknown device 4333
Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin B routed to IRQ 10
Region 4: I/O ports at efa0 [size=16]

00:1f.4 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #2) (rev 02) (prog-if 00 [UHCI])
Subsystem: Intel Corp.: Unknown device 4333
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin C routed to IRQ 9
Region 4: I/O ports at ef80 [size=32]

01:0b.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
Subsystem: Compex FN22-3(A) LinxPRO Ethernet Adapter
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (8000ns min, 16000ns max)
Interrupt: pin A routed to IRQ 3
Region 0: I/O ports at d400 [size=256]
Region 1: Memory at ff8ff800 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1+,D2+,D3hot+,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

01:0c.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
Subsystem: Realtek Semiconductor Co., Ltd. RT8139
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (8000ns min, 16000ns max)
Interrupt: pin A routed to IRQ 10
Region 0: I/O ports at d800 [size=256]
Region 1: Memory at ff8ffc00 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1+,D2+,D3hot+,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

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Quoted 7 lines

Oct 25 17:10:06 cs kernel: LIST_DELETE: ip_conntrack_core.c:301 `&ct->tuplehash[IP_CT_DIR_REPLY]'(de7be444) not in &ip_conntrack_hash [hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple)].

notes:

i can not show you /proc/modules because the box just hangs up after some time and i can't get that information.