PROBLEM: in.tftpd + iptables kernel panic
From: Kevin Stewart (kevins_at_netgate.net.nz)
Date: 05/11/04
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To: <linux-kernel@vger.kernel.org> Date: Wed, 12 May 2004 09:22:15 +1200
I am running a stable debian install with tftpd 0.17-9 kernel 2.4.26
While backing up cisco configs via tftp I caused a kernel panic
tftpd is run from inetd with
#grep tftp /etc/inetd.conf
tftp dgram udp wait nobody /usr/sbin/tcpd
/usr/sbin/in.tftpd /tftpboot
#ls -ld /tftpboot/
drwxrwxrwx 2 root root 4096 May 10 15:32 /tftpboot/
the tftp target file had been created and was set 777 I had been tftping
configs for most of the AM
I was also adding items to my iptables rules to allow tftp from specific
hosts
Eg
iptables -A INPUT -p udp --dport 69 -j TFTP
iptables -A INPUT -j LOG
iptables -A INPUT -j DROP
iptables -A TFTP -j ACCEPT --source x.x.x.x
iptables -A TFTP -j ACCEPT --source x.x.x.y
and I had a
tail -f /var/log/messages
looking at the source of the tftp (first drop) then cut past the ip to the
accept and the tftp continues.
I had just hit enter on the iptables -A TFTP ... when the panic occurred
It did not return a prompt
The box is not yet in production so I can test patches
Hope I have all relevant info
Thank you
Kevin Stewart
# cat /proc/version
Linux version 2.4.26 (root@TKHCollector2) (gcc version 2.95.4 20011002
(Debian prerelease)) #2 Thu Apr 22 13:29:23 NZST 2004
# ksymoops -k /proc/ksyms -l /proc/modules -o /lib/modules/2.4.26/ -m
/System.map-2.4.26 Oops.txt
ksymoops 2.4.5 on i686 2.4.26. Options used
-V (default)
-k /proc/ksyms (specified)
-l /proc/modules (specified)
-o /lib/modules/2.4.26/ (specified)
-m /System.map-2.4.26 (specified)
Unable to handle kernel NULL pointer derefrence at virtual address 00000018
c0244a3a
*pde = 00000000
EFLAGS: 00010286
eax: 00000000 ebx: f569e7a0 ebx: f569e7a0 edx: 00000000
esi: 00000001 edi: d0d15d18 ebp: d0d15ce4 esp: d0d15cb8
Process in.ftpd (pid: 10457, stackpage=d0d15000)
Stack: d0d15d14 d0d15d18 f533c800 e1729300 e1729308 223236d2 f569e7a0
04b01bca
4013a2d2 223236d2 0011748d d0d15dac c0244c1d d0d15d18 c02d30a0
f533c800
d0d15d9c c032a8d8 c021fedc f7e4a800 d0d15d10 c02d30a0 08051a20
00000000
Call Trace: [<c0244c1d>] [<c021fedc>] [<c0243970>] [<c021fedc>]
[<c0215998>]
[<c021fedc>] [<c021fedc>] [<c0215c4d>] [<c021fedc>] [<c021f7f9>]
[<c021fedc>]
[<c0238a55>] [<c02385f8>] [<c016498c>] [<c023e886>] [<c0207cb5>]
[<c0208a05>]
[<c012fdc7>] [<c0122972>] [<c0122ede>] [<c0122eea>] [<c0208a42>]
[<c02091e1>]
[<c0108613>]
Code: 83 78 18 00 74 15 8d 43 2c 50 e8 df 74 ed ff 89 c2 83 c4 04
Using defaults from ksymoops -t elf32-i386 -a i386
>>ebx; f569e7a0 <_end+353705c4/38562e24>
>>ebx; f569e7a0 <_end+353705c4/38562e24>
>>edi; d0d15d18 <_end+109e7b3c/38562e24>
>>ebp; d0d15ce4 <_end+109e7b08/38562e24>
>>esp; d0d15cb8 <_end+109e7adc/38562e24>
Trace; c0244c1d <ip_conntrack_in+139/26c>
Trace; c021fedc <output_maybe_reroute+0/14>
Trace; c0243970 <ip_conntrack_local+54/58>
Trace; c021fedc <output_maybe_reroute+0/14>
Trace; c0215998 <nf_iterate+30/84>
Trace; c021fedc <output_maybe_reroute+0/14>
Trace; c021fedc <output_maybe_reroute+0/14>
Trace; c0215c4d <nf_hook_slow+b5/144>
Trace; c021fedc <output_maybe_reroute+0/14>
Trace; c021f7f9 <ip_build_xmit+2a9/328>
Trace; c021fedc <output_maybe_reroute+0/14>
Trace; c0238a55 <udp_sendmsg+351/3cc>
Trace; c02385f8 <udp_getfrag+0/c4>
Trace; c016498c <ext2_truncate+3c8/3d4>
Trace; c023e886 <inet_sendmsg+3a/40>
Trace; c0207cb5 <sock_sendmsg+69/88>
Trace; c0208a05 <sys_sendto+d9/f8>
Trace; c012fdc7 <do_truncate+6b/98>
Trace; c0122972 <__vma_link+62/b0>
Trace; c0122ede <do_mmap_pgoff+42e/4ec>
Trace; c0122eea <do_mmap_pgoff+43a/4ec>
Trace; c0208a42 <sys_send+1e/24>
Trace; c02091e1 <sys_socketcall+119/200>
Trace; c0108613 <system_call+33/38>
Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: 83 78 18 00 cmpl $0x0,0x18(%eax)
Code; 00000004 Before first symbol
4: 74 15 je 1b <_EIP+0x1b> 0000001b Before
first symbol
Code; 00000006 Before first symbol
6: 8d 43 2c lea 0x2c(%ebx),%eax
Code; 00000009 Before first symbol
9: 50 push %eax
Code; 0000000a Before first symbol
a: e8 df 74 ed ff call ffed74ee <_EIP+0xffed74ee> ffed74ee
<END_OF_CODE+76443e7/????>
Code; 0000000f Before first symbol
f: 89 c2 mov %eax,%edx
Code; 00000011 Before first symbol
11: 83 c4 04 add $0x4,%esp
<0>Kernel panic: Aiee, killing interrupt handler!
# 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 TKHCollector2 2.4.26 #2 Thu Apr 22 13:29:23 NZST 2004 i686 unknown
Gnu C 2.95.4
Gnu make 3.79.1
util-linux 2.11n
mount 2.11n
modutils 2.4.15
e2fsprogs 1.27
PPP 2.4.1
Linux C Library 2.2.5
Dynamic linker (ldd) 2.2.5
Procps 2.0.7
Net-tools 1.60
Console-tools 0.2.3
Sh-utils 2.0.11
Modules Loaded af_packet
cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Pentium(R) 4 CPU 2.40GHz
stepping : 7
cpu MHz : 2399.764
cache size : 512 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 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
bogomips : 4613.73
# cat /proc/modules
af_packet 8456 0 (unused)
# 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
03f8-03ff : serial(set)
0cf8-0cff : PCI conf1
4000-400f : PCI device 1039:5513
4000-4007 : ide0
4008-400f : ide1
d000-dfff : PCI Bus #01
d000-d07f : PCI device 1039:6325
e000-e0ff : PCI device 1039:7012
e400-e47f : PCI device 1039:7012
e800-e87f : PCI device 10b7:9805
e800-e87f : 00:06.0
ec00-ecff : PCI device 10ec:8139
# cat /proc/iomem
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000d4000-000d67ff : Extension ROM
000f0000-000fffff : System ROM
00100000-3dfeffff : System RAM
00100000-0025fde6 : Kernel code
0025fde7-002d469b : Kernel data
3dff0000-3dff2fff : ACPI Non-volatile Storage
3dff3000-3dffffff : ACPI Tables
e0000000-e7ffffff : PCI Bus #01
e0000000-e7ffffff : PCI device 1039:6325
e8000000-ebffffff : PCI device 1039:0651
ed000000-ed0fffff : PCI Bus #01
ed000000-ed01ffff : PCI device 1039:6325
ed100000-ed100fff : PCI device 1039:7001
ed101000-ed101fff : PCI device 1039:7002
ed102000-ed10207f : PCI device 10b7:9805
ed103000-ed103fff : PCI device 1039:7001
ed104000-ed1040ff : PCI device 10ec:8139
fec00000-ffffffff : reserved
# lspci -vvv
00:00.0 Host bridge: Silicon Integrated Systems [SiS]: Unknown device 0651
(rev 02)
Subsystem: Silicon Integrated Systems [SiS]: Unknown device 0651
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: 32
Region 0: Memory at e8000000 (32-bit, non-prefetchable) [size=64M]
Capabilities: [c0] AGP version 2.0
Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] 5591/5592 AGP (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: 64
Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
I/O behind bridge: 0000d000-0000dfff
Memory behind bridge: ed000000-ed0fffff
Prefetchable memory behind bridge: e0000000-e7ffffff
BridgeCtl: Parity- SERR+ NoISA+ VGA+ MAbort- >Reset- FastB2B-
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] 85C503/5513 (rev 25)
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
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (prog-if
80 [Master])
Subsystem: Micro-star International Co Ltd: Unknown device 5332
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: 128
Interrupt: pin ? routed to IRQ 3
Region 4: I/O ports at 4000 [size=16]
Capabilities: [58] 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-
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS]
SiS7012 PCI Audio Accelerator (rev a0)
Subsystem: Micro-star International Co Ltd: Unknown device 5332
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: 32 (13000ns min, 2750ns max)
Interrupt: pin C routed to IRQ 11
Region 0: I/O ports at e000 [size=256]
Region 1: I/O ports at e400 [size=128]
Capabilities: [48] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=55mA
PME(D0-,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00:03.0 USB Controller: Silicon Integrated Systems [SiS] 7001 (rev 0f)
(prog-if 10 [OHCI])
Subsystem: Micro-star International Co Ltd: Unknown device 5332
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: 32 (20000ns max), cache line size 08
Interrupt: pin A routed to IRQ 5
Region 0: Memory at ed103000 (32-bit, non-prefetchable) [size=4K]
00:03.1 USB Controller: Silicon Integrated Systems [SiS] 7001 (rev 0f)
(prog-if 10 [OHCI])
Subsystem: Micro-star International Co Ltd: Unknown device 5332
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: 32 (20000ns max), cache line size 08
Interrupt: pin B routed to IRQ 11
Region 0: Memory at ed100000 (32-bit, non-prefetchable) [size=4K]
00:03.3 USB Controller: Silicon Integrated Systems [SiS]: Unknown device
7002 (prog-if 20)
Subsystem: Micro-star International Co Ltd: Unknown device 5332
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: 32 (20000ns max), cache line size 08
Interrupt: pin D routed to IRQ 9
Region 0: Memory at ed101000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00:06.0 Ethernet controller: 3Com Corporation 3c980-TX 10/100baseTX NIC
[Python-T] (rev 78)
Subsystem: 3Com Corporation: Unknown device 1000
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: 32 (2500ns min, 2500ns max), cache line size 08
Interrupt: pin A routed to IRQ 5
Region 0: I/O ports at e800 [size=128]
Region 1: Memory at ed102000 (32-bit, non-prefetchable) [size=128]
Expansion ROM at <unassigned> [disabled] [size=128K]
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-
00:0f.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139 (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: 32 (8000ns min, 16000ns max)
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at ec00 [size=256]
Region 1: Memory at ed104000 (32-bit, non-prefetchable) [size=256]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0-,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS]: Unknown
device 6325 (prog-if 00 [VGA])
Subsystem: Micro-star International Co Ltd: Unknown device 5339
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 3
BIST result: 00
Region 0: Memory at e0000000 (32-bit, prefetchable) [size=128M]
Region 1: Memory at ed000000 (32-bit, non-prefetchable) [size=128K]
Region 2: I/O ports at d000 [size=128]
Capabilities: [40] 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-
Capabilities: [50] AGP version 2.0
Status: RQ=15 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
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- Previous message: John McCutchan: "Re: [RFC/PATCH] inotify -- a dnotify replacement"
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