On 4/4/11 4:35 PM, David Somayajulu wrote:
Hi All,
Is there some way I can setup a running FreeBSD - (I use PCBSD7.2) - to break into kgdb
when the system panics. I am trying to get a stack trace when "Fatal trap 12: page
fault while in kernel mode" happens.
thanks
david S.
sure but firstly have you already got everything set up so you can get
into kgdb normally?
(serial cable? (or firewire?) ports all set up right? second machine?
here are som bits of the puzzle for my machine:
from /boot/device.hints:
hint.uart.1.at="isa"
hint.uart.1.port="0x2F8"
hint.uart.1.flags="0x80"
hint.uart.1.irq="3"
hint.uart.1.baud="115200"
in /etc/sysctl.conf:
debug.kdb.current=gdb
but usually I find it better to go to ddb first and do a ps and
backtrace as
ps is a pain on gdb and needs macros etc.
and of course kgdb needs to be set up correctly
the handbook says a lot about that.
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