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From URL - http://kernel.org/pub/linux/docs/lkml/reporting-bugs.html [1.] One line summary of the problem: kernel panic/oops system hangs [2.] Full description of the problem/report: After some random period of time (from 1 hour to several days) kernel receives an 'oops' and dies. Requires power cycle to recover. I've a few of the 'oops' output saved and converted with ksymoops if required (included one below) Error appear to be in the iptables connection_tracking actually. [3.] Keywords (i.e., modules, networking, kernel): networking kernel oops [4.] Kernel version (from /proc/version): Linux version 2.4.31 (root@neo-u2.ops-netman.net) (gcc version 3.3.5 (Debian 1:3.3.5-13)) #1 SMP Sun Mar 12 15:09:22 GMT 2006 [5.] Output of Oops.. message (if applicable) with symbolic information resolved (see Documentation/oops-tracing.txt) Unable to handle kernel NULL pointer dereference at virtual address 00000012 printing eip: c0122485 *pde = 00000000 Oops: 0002 CPU: 0 EIP: 0010:[<c0122485>] Not tainted EFLAGS: 00010006 eax: ca5e47a4 ebx: dc2f3704 ecx: 02932dff edx: 0000000e esi: 00000282 edi: 02932e00 ebp: c7a76000 esp: c7a77bf4 ds: 0018 es: 0018 ss: 0018 Process smtp (pid: 11743, stackpage=c7a77000) Stack: 00000001 00000000 dc2f36c0 dc2f3704 f0b62cb1 dc2f3704 00000001 e16e1042 00000001 f0b63bf7 dc2f36c0 02932e00 cc7cab20 c7a77cdc dc2f36c0 f0b65660 f0b61dfe dc2f36c0 e16e102e 000005b6 00000000 00000000 00000000 a9d690db Call Trace: [<f0b62cb1>] [<f0b63bf7>] [<f0b65660>] [<f0b61dfe>] [<c0231580>] [<c0201c74>] [<c0231580>] [<c0231580>] [<c020201b>] [<c0231580>] [<f0b64ec0>] [<c02313ad>] [<c0231580>] [<c01f85e4>] [<c01f873d>] [<c01f88b5>] [<c011ee36>] [<c010af16>] [<c010d5b8>] [<c0117e64>] [<c013fe2e>] [<c01f8427>] [<c018c3bc>] [<c0172a9c>] [<c012e030>] [<c018b2f5>] [<c012e030>] [<c017a0cd>] [<c0155bbd>] [<c015780c>] [<c012e1e7>] [<c012e030>] [<c013eb09>] [<c0108ebb>] Code: 89 5a 04 89 13 89 43 04 89 18 c6 05 bc df 2a c0 01 56 9d 8b <0>Kernel panic: Aiee, killing interrupt handler! In interrupt handler - not syncing neo-u2:/home/morrowc/work/oops# more output-ksymoops-06-25-01 ksymoops 2.4.9 on i686 2.4.31. Options used -v /usr/src/linux-2.4.31/vmlinux (specified) -k /proc/ksyms (default) -l /proc/modules (default) -o /lib/modules/2.4.31/ (default) -m /usr/src/linux-2.4.31/System.map (specified) Unable to handle kernel NULL pointer dereference at virtual address 00000012 c0122485 *pde = 00000000 Oops: 0002 CPU: 0 EIP: 0010:[<c0122485>] Not tainted Using defaults from ksymoops -t elf32-i386 -a i386 EFLAGS: 00010006 eax: ca5e47a4 ebx: dc2f3704 ecx: 02932dff edx: 0000000e esi: 00000282 edi: 02932e00 ebp: c7a76000 esp: c7a77bf4 ds: 0018 es: 0018 ss: 0018 Process smtp (pid: 11743, stackpage=c7a77000) Stack: 00000001 00000000 dc2f36c0 dc2f3704 f0b62cb1 dc2f3704 00000001 e16e1042 00000001 f0b63bf7 dc2f36c0 02932e00 cc7cab20 c7a77cdc dc2f36c0 f0b65660 f0b61dfe dc2f36c0 e16e102e 000005b6 00000000 00000000 00000000 a9d690db Call Trace: [<f0b62cb1>] [<f0b63bf7>] [<f0b65660>] [<f0b61dfe>] [<c0231580>] [<c0201c74>] [<c0231580>] [<c0231580>] [<c020201b>] [<c0231580>] [<f0b64ec0>] [<c02313ad>] [<c0231580>] [<c01f85e4>] [<c01f873d>] [<c01f88b5>] [<c011ee36>] [<c010af16>] [<c010d5b8>] [<c0117e64>] [<c013fe2e>] [<c01f8427>] [<c018c3bc>] [<c0172a9c>] [<c012e030>] [<c018b2f5>] [<c012e030>] [<c017a0cd>] [<c0155bbd>] [<c015780c>] [<c012e1e7>] [<c012e030>] [<c013eb09>] [<c0108ebb>] Code: 89 5a 04 89 13 89 43 04 89 18 c6 05 bc df 2a c0 01 56 9d 8b >>EIP; c0122485 <add_timer+55/110> <===== >>eax; ca5e47a4 <_end+a29c204/307f8ac0>>>ebx; dc2f3704 <_end+1bfab164/307f8ac0>>>ebp; c7a76000 <_end+772da60/307f8ac0>>>esp; c7a77bf4 <_end+772f654/307f8ac0> Trace; f0b62cb1 <[ip_conntrack]ip_ct_refresh+b1/c0> Trace; f0b63bf7 <[ip_conntrack]tcp_packet+177/220> Trace; f0b65660 <[ip_conntrack]ip_conntrack_protocol_tcp+0/40> Trace; f0b61dfe <[ip_conntrack]ip_conntrack_in+fe/2b0> Trace; c0231580 <ip_rcv_finish+0/23f> Trace; c0201c74 <nf_iterate+54/a0> Trace; c0231580 <ip_rcv_finish+0/23f> Trace; c0231580 <ip_rcv_finish+0/23f> Trace; c020201b <nf_hook_slow+cb/210> Trace; c0231580 <ip_rcv_finish+0/23f> Trace; f0b64ec0 <[ip_conntrack]ip_conntrack_in_ops+0/0> Trace; c02313ad <ip_rcv+3dd/440> Trace; c0231580 <ip_rcv_finish+0/23f> Trace; c01f85e4 <netif_receive_skb+e4/1b0> Trace; c01f873d <process_backlog+8d/130> Trace; c01f88b5 <net_rx_action+d5/180> Trace; c011ee36 <do_softirq+d6/e0> Trace; c010af16 <do_IRQ+e6/f0> Trace; c010d5b8 <call_do_IRQ+5/d> Trace; c0117e64 <.text.lock.sched+57/1e3> Trace; c013fe2e <__wait_on_buffer+5e/90> Trace; c01f8427 <net_tx_action+57/130> Trace; c018c3bc <reiserfs_prepare_for_journal+7c/a0> Trace; c0172a9c <reiserfs_update_sd+cc/1c0> Trace; c012e030 <file_read_actor+0/100> Trace; c018b2f5 <journal_begin+25/30> Trace; c012e030 <file_read_actor+0/100> Trace; c017a0cd <reiserfs_dirty_inode+6d/e0> Trace; c0155bbd <__mark_inode_dirty+bd/c0> Trace; c015780c <update_atime+6c/70> Trace; c012e1e7 <generic_file_read+b7/1b0> Trace; c012e030 <file_read_actor+0/100> Trace; c013eb09 <sys_read+99/110> Trace; c0108ebb <system_call+33/38> Code; c0122485 <add_timer+55/110> 00000000 <_EIP>: Code; c0122485 <add_timer+55/110> <===== 0: 89 5a 04 mov %ebx,0x4(%edx) <===== Code; c0122488 <add_timer+58/110> 3: 89 13 mov %edx,(%ebx) Code; c012248a <add_timer+5a/110> 5: 89 43 04 mov %eax,0x4(%ebx) Code; c012248d <add_timer+5d/110> 8: 89 18 mov %ebx,(%eax) Code; c012248f <add_timer+5f/110> a: c6 05 bc df 2a c0 01 movb $0x1,0xc02adfbc Code; c0122496 <add_timer+66/110> 11: 56 push %esi Code; c0122497 <add_timer+67/110> 12: 9d popf Code; c0122498 <add_timer+68/110> 13: 8b 00 mov (%eax),%eax <0>Kernel panic: Aiee, killing interrupt handler! [6.] A small shell script or example program which triggers the problem (if possible) N/A [7.] Environment [7.1.] Software (add the output of the ver_linux script here) s# sh ver_linux If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes. Linux neo-u2.ops-netman.net 2.4.31 #1 SMP Sun Mar 12 15:09:22 GMT 2006 i686 GNU/Linux Gnu C 3.3.5 Gnu make 3.80 util-linux 2.12p mount 2.12p modutils 2.4.26 e2fsprogs 1.37 PPP 2.4.3 Linux C Library 2.3.2 Dynamic linker (ldd) 2.3.2 Procps 3.2.1 Net-tools 1.60 Console-tools 0.2.3 Sh-utils 5.2.1 Modules Loaded sd_mod scsi_mod ipt_LOG ipt_REJECT ipt_state ip_conntrack iptable_filter ip_tables ip6t_LOG ip6table_filter ip6_tables [7.2.] Processor information (from /proc/cpuinfo): # cat /proc/version Linux version 2.4.31 (root@neo-u2.ops-netman.net) (gcc version 3.3.5 (Debian 1:3.3.5-13)) #1 SMP Sun Mar 12 15:09:22 GMT 2006 You have new mail in /var/mail/morrowc neo-u2:/home/morrowc/work/oops# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 8 model name : Pentium III (Coppermine) stepping : 3 cpu MHz : 596.009 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 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse bogomips : 1189.47 processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 8 model name : Pentium III (Coppermine) stepping : 3 cpu MHz : 596.009 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 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse bogomips : 1189.47 [7.3.] Module information (from /proc/modules): # cat /proc/modules sd_mod 10860 0 (autoclean) (unused) scsi_mod 91636 1 (autoclean) [sd_mod] ipt_LOG 3544 1 (autoclean) ipt_REJECT 3384 1 (autoclean) ipt_state 536 2 (autoclean) ip_conntrack 22432 0 (autoclean) [ipt_state] iptable_filter 1740 1 (autoclean) ip_tables 12960 4 [ipt_LOG ipt_REJECT ipt_state iptable_filter] ip6t_LOG 4312 1 (autoclean) ip6table_filter 1836 1 (autoclean) ip6_tables 13600 2 [ip6t_LOG ip6table_filter] [7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem) # cat /proc/ioports 0000-001f : dma1 0020-003f : pic1 0040-0043 : timer0 0050-0053 : timer1 0060-006f : keyboard 0080-008f : dma page reg 00a0-00bf : pic2 00c0-00df : dma2 00f0-00ff : fpu 0170-0177 : ide1 01f0-01f7 : ide0 02f8-02ff : serial(set) 0376-0376 : ide1 03c0-03df : vga+ 03f6-03f6 : ide0 03f8-03ff : serial(set) 0400-043f : Intel Corp. 82371AB/EB/MB PIIX4 ACPI 0440-045f : Intel Corp. 82371AB/EB/MB PIIX4 ACPI 0cf8-0cff : PCI conf1 c000-cfff : PCI Bus #01 d000-dfff : PCI Bus #02 df00-df3f : Intel Corp. 82557/8/9 [Ethernet Pro 100] (#3) df00-df3f : eepro100 ee80-eebf : Intel Corp. 82557/8/9 [Ethernet Pro 100] (#2) ee80-eebf : eepro100 ef00-ef3f : Intel Corp. 82557/8/9 [Ethernet Pro 100] ef00-ef3f : eepro100 ef80-ef9f : Intel Corp. 82371AB/EB/MB PIIX4 USB ffa0-ffaf : Intel Corp. 82371AB/EB/MB PIIX4 IDE ffa0-ffa7 : ide0 ffa8-ffaf : ide1 # cat /proc/iomem 00000000-0009fbff : System RAM 0009fc00-0009ffff : reserved 000a0000-000bffff : Video RAM area 000c0000-000c7fff : Video ROM 000c9800-000ca7ff : Extension ROM 000f0000-000fffff : System ROM 00100000-2fffffff : System RAM 00100000-0026e208 : Kernel code 0026e209-002bebbf : Kernel data fbd00000-fddfffff : PCI Bus #01 fc000000-fcffffff : Chips and Technologies F69000 HiQVideo fde00000-fe2fffff : PCI Bus #02 fe100000-fe1fffff : Intel Corp. 82557/8/9 [Ethernet Pro 100] (#3) fe2ff000-fe2fffff : Intel Corp. 82557/8/9 [Ethernet Pro 100] (#3) fe2ff000-fe2fffff : eepro100 fe800000-fe8fffff : Intel Corp. 82557/8/9 [Ethernet Pro 100] (#2) fea00000-feafffff : Intel Corp. 82557/8/9 [Ethernet Pro 100] febfe000-febfefff : Intel Corp. 82557/8/9 [Ethernet Pro 100] (#2) febfe000-febfefff : eepro100 febff000-febfffff : Intel Corp. 82557/8/9 [Ethernet Pro 100] febff000-febfffff : eepro100 fec00000-fec00fff : reserved fee00000-fee00fff : reserved ff000000-ff0fffff : PCI Bus #01 ff100000-ff1fffff : PCI Bus #02 ff400000-ff7fffff : Intel Corp. 440GX - 82443GX Host bridge fffc0000-ffffffff : reserved [7.5.] PCI information ('lspci -vvv' as root) # lspci -vvv 0000:00:00.0 Host bridge: Intel Corp. 440GX - 82443GX Host bridge 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 Region 0: Memory at ff400000 (32-bit, prefetchable) [size=4M] Capabilities: [a0] AGP version 1.0 Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2 Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none> 0000:00:01.0 PCI bridge: Intel Corp. 440GX - 82443GX AGP bridge (prog-if 00 [Normal decode]) 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 Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 I/O behind bridge: 0000c000-0000cfff Memory behind bridge: fbd00000-fddfffff Prefetchable memory behind bridge: ff000000-ff0fffff BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B+ 0000:00:07.0 ISA bridge: Intel Corp. 82371AB/EB/MB PIIX4 ISA (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 0000:00:07.1 IDE interface: Intel Corp. 82371AB/EB/MB PIIX4 IDE (rev 01) (prog-if 80 [Master]) 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 Region 4: I/O ports at ffa0 [size=16] 0000:00:07.2 USB Controller: Intel Corp. 82371AB/EB/MB PIIX4 USB (rev 01) (prog-if 00 [UHCI]) 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 Interrupt: pin D routed to IRQ 0 Region 4: I/O ports at ef80 [size=32] 0000:00:07.3 Bridge: Intel Corp. 82371AB/EB/MB PIIX4 ACPI (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- Interrupt: pin ? routed to IRQ 9 0000:00:11.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) Subsystem: Intel Corp. 82559 Fast Ethernet LAN on Motherboard 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 (2000ns min, 14000ns max), Cache Line Size: 0x08 (32 bytes) Interrupt: pin A routed to IRQ 11 Region 0: Memory at febff000 (32-bit, non-prefetchable) [size=4K] Region 1: I/O ports at ef00 [size=64] Region 2: Memory at fea00000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at fe900000 [disabled] [size=1M] Capabilities: [dc] Power Management version 2 Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=2 PME- 0000:00:12.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) Subsystem: Intel Corp. 82559 Fast Ethernet LAN on Motherboard 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 (2000ns min, 14000ns max), Cache Line Size: 0x08 (32 bytes) Interrupt: pin A routed to IRQ 10 Region 0: Memory at febfe000 (32-bit, non-prefetchable) [size=4K] Region 1: I/O ports at ee80 [size=64] Region 2: Memory at fe800000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at fe700000 [disabled] [size=1M] Capabilities: [dc] Power Management version 2 Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=2 PME- 0000:00:14.0 PCI bridge: Digital Equipment Corporation DECchip 21152 (rev 03) (prog-if 00 [Normal decode]) 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, Cache Line Size: 0x08 (32 bytes) Bus: primary=00, secondary=02, subordinate=02, sec-latency=64 I/O behind bridge: 0000d000-0000dfff Memory behind bridge: fde00000-fe2fffff Prefetchable memory behind bridge: 00000000ff100000-00000000ff100000 BridgeCtl: Parity+ SERR+ NoISA- VGA- MAbort- >Reset- FastB2B- Capabilities: [dc] Power Management version 1 Flags: PMEClk- DSI- D1- D2- AuxCurrent=220mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Bridge: PM- B3+ 0000:01:00.0 VGA compatible controller: Chips and Technologies F69000 HiQVideo (rev 64) (prog-if 00 [VGA]) Subsystem: Chips and Technologies F69000 HiQVideo 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 A routed to IRQ 0 Region 0: Memory at fc000000 (32-bit, non-prefetchable) [size=16M] Expansion ROM at fddc0000 [disabled] [size=256K] 0000:02:0e.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) Subsystem: Intel Corp. EtherExpress PRO/100+ Management 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 (2000ns min, 14000ns max), Cache Line Size: 0x08 (32 bytes) Interrupt: pin A routed to IRQ 10 Region 0: Memory at fe2ff000 (32-bit, non-prefetchable) [size=4K] Region 1: I/O ports at df00 [size=64] Region 2: Memory at fe100000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at fe000000 [disabled] [size=1M] Capabilities: [dc] Power Management version 2 Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=2 PME- [7.6.] SCSI information (from /proc/scsi/scsi) # cat /proc/scsi/scsi Attached devices: none [7.7.] Other information that might be relevant to the problem (please look in /proc and include all information that you think to be relevant): [X.] Other notes, patches, fixes, workarounds: If more info is required I believe I can provide it if requested. 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