kernel panic while using tcpdump

[Kris Kennaway]

Bartosz Giza wrote:
> Hi,
> 
> We are using a lot of i386 computers as routers for out network. All of those 
> routers are using FreeBSD from 4.x to 7.x (exept 5.x)
> 
> We are having problem with kernel panic on routers based on 6.x and 7.x while 
> using tcpdump or trafshow. It is not that always we got kernel panics. We got 
> them in random occurence. Some time i can tcpdump for a minute and turn it 
> off and again while i am testing packets comming thru iface for an hour, and 
> nothin happens. But sometime i run tcpdump and after few second i got kernel 
> panic. It happens mostly when i am trying to close tcpdump with ctrl-c.
> It happens also with trafshow3 which we are using to track transfers.
> 
> It happens on 6.x series and i thought that maybe there is bug in this line 
> and i have tryied 7.x line i got kernel panics also.
> 
> The problem is that i can't really get message when it happens because those 
> routers are in remote places and after 15 second they are rebooting (and that 
> is great:)
> 
> Is there any way to save this message to a file that i could paste over here ?
> 
> Could some one help me to diagnoze this behaviour ?
> 
> We are using i386 arch on all routers. The hardware is totally different from 
> quite old parts to quite new dell.
> What is strange on 4.x we never hit such a kernel panic.
> 
> We are using mostly fxp NIC on all routers with some exeptions and i have 
> started wondering that maybe fxp driver has some bug or bpf code.
> 
> Thanks for any help in diagnosing this panics.
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http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html

Kris