Date: Sat, 27 Mar 1999 17:47:38 +1030 From: Greg Lehey <grog@lemis.com> To: Jesse <j@lumiere.net>, "Daniel C. Sobral" <dcs@newsguy.com> Cc: freebsd-net@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Taking panic dumps (was: 3.1-STABLE dies on 40+ connects (resolved)) Message-ID: <19990327174738.B425@lemis.com> In-Reply-To: <Pine.BSF.4.05.9903251606080.1956-100000@leaf.lumiere.net>; from Jesse on Thu, Mar 25, 1999 at 04:09:44PM -0800 References: <36FACE5B.D0926C2C@newsguy.com> <Pine.BSF.4.05.9903251606080.1956-100000@leaf.lumiere.net>
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On Thursday, 25 March 1999 at 16:09:44 -0800, Jesse wrote:
>
>>> Thanks everybody for your help! FreeBSD is great and it's 80% about the
>>> community. Not that I didn't always know it. =)
>>
>> Notice that a core dump + kernel with symbols would still be very
>> useful to find *where* in our code is the bug.
>
> I asked in other messages if anyone still wanted me to do that. No one
> replied. Anyway, I'll do this at an off hour and get a core dump.
OK. I really should put this in the FAQ, since it's really important.
1. Build a kernel with debug symbols. Assuming your config file is
called MYKERNEL, do:
n
cd /sys/i386/conf
config -g MYCONFIG
cd ../../compile/MYCONFIG
make depend all
cp kernel kernel.gdb
strip -g kernel
make install
2. If you don't have the directory /var/crash, create it in a file
system which has space for the dump (memory size) and the kernel
(about 10 MB, 15 is safer).
3. You *must* have a single swap area which is at least a little
larger than physical memory. You can have other swap areas as
well, but for dumping you need one which will take the contents of
memory and a little additional for headers (1 MB would be more
than enough extra). Assuming you have such a partition on
/dev/da0s1b, add a line like this to /etc/rc.conf:
dumpdev="/dev/da0s1b" # Device name to crashdump to (if enabled).
If you don't have an /etc/rc.conf, put it in
/etc/defaults/rc.conf.
4. Boot the new kernel.
There are a number of points to comment about:
1. If you have the space (about 10 MB), you don't need to copy kernel
to kernel.gdb and strip the original. It doesn't buy you much,
though, unless you have ddb installed, and that is rather painful
to use.
2. /etc/rc.conf and friends are still moving around and changing
their relationships to each other. This applies to 3.1-RELEASE.
It doesn't apply exactly to previous or subsequent releases,
though you should be able to figure out what's going on.
Greg
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