Kernel panic

[Jason Forbes <jforbes_(_at_)_where_(_dot_)_net>]

Hey all,

I need some help tracking down what is causing my firewall to crash.

I'm running squid, ipf and ipnat for a smallish network (~100 users).

Lately, it has been dropping into ddb with the following message:

	panic: m_copydata: null mbuf in skip

I can't get it to reboot from ddb. Sometimes it writes the core file 
and sometimes it doesn't.

Is this a disk problem? Any help would be greatly appreciated.

Here is the dmesg result:

OpenBSD 2.6 (GENERIC) #696: Tue Nov  2 01:46:05 MST 1999
    deraadt_(_at_)_i386_(_dot_)_openbsd_(_dot_)_org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Intel Pentium II ("GenuineIntel" 686-class, 512KB L2 cache) 449 MHz
cpu0: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,SYS,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR
BIOS mem  = 653312 conventional, 133159936 extended
real mem  = 133816320
avail mem = 120614912
using 1659 buffers containing 6795264 bytes of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(a1) BIOS, date 02/16/99
bios0: diskinfo 0xe055800c cksumlen 1 memmap 0xe0558088
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "Intel 82443BX PCI-AGP (PAC)" rev 0x03
ppb0 at pci0 dev 1 function 0 "Intel 82443BX AGP (PAC)" rev 0x03
pci1 at ppb0 bus 1
"Nvidia Riva TNT" rev 0x04 at pci1 dev 0 function 0 not configured
pcib0 at pci0 dev 7 function 0 "Intel 82371AB PIIX4 ISA" rev 0x02
pciide0 at pci0 dev 7 function 1 "Intel 82371AB IDE (PIIX4)" rev 
0x01: DMA, channel 0 wired to compatibility, channel 1 wired to 
compatibility
wd0 at pciide0 channel 0 drive 0: <WDC AC313000R>
wd0: can use 32-bit, PIO mode 4, DMA mode 2, Ultra-DMA mode 2
wd0: 16-sector PIO, LBA, 12416MB, 16383 cyl, 16 head, 63 sec, 25429824 sectors
pciide0: channel 0 interrupting at irq 14
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (using DMA data transfers)
atapiscsi0 at pciide0 channel 1
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <NEC, CD-ROM DRIVE:28D, 3.04> SCSI0 
5/cdrom removable
cd0: can use 32-bit, PIO mode 4, DMA mode 2, Ultra-DMA mode 2
pciide0: channel 1 interrupting at irq 15
cd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2 (using DMA data transfers)
"Intel 82371AB USB (PIIX4)" rev 0x01 at pci0 dev 7 function 2 not configured
"Intel 82371AB Power Management (PIIX4)" rev 0x02 at pci0 dev 7 
function 3 not configured
vendor "Yamaha", unknown product 0xc (class multimedia, subclass 
audio, rev 0x03) at pci0 dev 12 function 0 not configured
xl0 at pci0 dev 14 function 0 "3Com 3c905B 100Base-TX" rev 0x30: irq 
5 address 00:50:04:6f:0a:dc
exphy0 at xl0 phy 24: 3Com internal media interface
xl1 at pci0 dev 15 function 0 "3Com 3c905B 100Base-TX" rev 0x30: irq 
10 address 00:50:04:6f:0b:0b
exphy1 at xl1 phy 24: 3Com internal media interface
xl2 at pci0 dev 16 function 0 "3Com 3c905B 100Base-TX" rev 0x30: irq 
9 address 00:50:04:6f:0a:d7
exphy2 at xl2 phy 24: 3Com internal media interface
isa0 at pcib0
isadma0 at isa0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
sysbeep0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
npx0 at isa0 port 0xf0/16: using exception 16
pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pccom1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
vt0 at isa0 port 0x60/16 irq 1: generic VGA, 80 col, color, 8 scr, mf2-kbd
pms0 at vt0 irq 12
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
biomask c040 netmask c660 ttymask d6e2
pctr: 686-class user-level performance counters enabled
dkcsum: wd0 matched BIOS disk 80
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302
WARNING: / was not properly unmounted
IP Filter: initialized.  Default = pass all, Logging = enabled


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Animal testing is a terrible idea; they get very nervous
and give the wrong answers. 

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