Date: Sun, 1 Sep 2002 12:08:17 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Crash with KVM monitoring in place ... Message-ID: <200209011908.g81J8HbP014776@apollo.backplane.com> References: <20020901153933.S27764-100000@hub.org>
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:> 'trace'. If over several crashes it dies in the same place
:> then we at least have an idea where to look.
:>
:> How large is your swap space, or your largest free partition?
:
:My swap is only ~2gig, and my drive looks like:
Right... then do as I suggested in a previous email. Reduce
the machine's memory to 2G via /boot/loader.conf:
hw.physmem="2048m"
Then reboot and turn on dumps to the swap device. If you
can reproduce the crash with the machine downgraded to 2G
we should get a dump we can work with.
:Awhile back, someone posted this to the lists:
:
:http://www.cs.duke.edu/~anderson/freebsd/netdump/readme.html
:
:To do dumps to a 'dump server' ... i tried it on a 4.4 kernel, I believe
:it was, and altho it looked like it was dumping, I got zero bits on the
:remote server, so I'm figuring changes in the kernel itself ...
:
:Any chance on getting such working (and maybe into) the latest source
:trees? It seems to be it would be most valuable, especially as more and
:more "large servers" are coming online? I've got the two servers sitting
:next to each other, so network isn't an issue, and they are both running
:fxp interfaces ... the code itself is at:
:
:http://www.cs.duke.edu/~anderson/freebsd/netdump/
:
:with the netdump_client.c code being 17k, and the _server.c code being 7k,
:so they aren't that large .. the code appears to be from '00, so don't
:know what would have to be changed to reflect -STABLE's present state ...
I really like the idea of doing dumps over the net. The code looks
workable though a good deal of work is probably required to make
the network stuff work again. I don't have time to do it myself,
though, but this sounds like a good project for someone.
-Matt
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