Crash Dump

[Greg 'groggy' Lehey]

On Monday, 30 May 2005 at 23:28:38 -0700, Kevin Downey wrote:
> first off:
> FreeBSD zifnab 6.0-CURRENT FreeBSD 6.0-CURRENT #0: Mon May 30 07:53:44
> PDT 2005     kevin at zifnab:/usr/obj/usr/src/sys/SEE_NO_EVIL  i386
> built from sources cvsuped yesterday (the 29th of May) ontop of the
> SNAP002 or whatever it was called from March.
>
> Now, I am getting what seem to me, to be random crashes. Of course
> there are many things in this world which seem random to me because I
> do not know what is going on. These crashes indubitably fall in to
> this category of things.
> I figure the best way to learn more about this is to ask other people.
> And I also know that when asking other people, particular this list,
> it is a good idea to be in possession of various background
> information. But, and here is the twist, when the panic happens, the
> 'dumping X megabytes of memory`, or whatever the exact wording is,
> message pops up, and then just sits there for however long I am
> willing to let the machine sit(2 hours is the upper limit on that).
> The IDE activity LED does not blink(I assume it should be blinking if
> the memory is being dumped to swap on an IDE drive), it does blink
> when I hit keys on the keyboard.

Sounds like the crash involves block I/O, so you're not able to dump.
Try remote debugging.  See the handbook or
http://www.lemis.com/grog/Papers/Debug-tutorial/tutorial.pdf for
details.

> dmesg from the machine: http://kevin.is.a.zombie.org/dmesg
> kernel config: http://kevin.is.a.zombie.org/SEE_NO_EVIL
>
> kevin at zifnab:~% swapinfo
> Device          1K-blocks     Used    Avail Capacity
> /dev/ad0s1b       2572288    19972  2572288     1%

This won't be your issue here, but the only important thing is that
the swap partition should be slightly larger than RAM (about 64 kB or
so).

> And on a somewhat unrelated note, I get hard lockups(have to hit the
> reboot button to reboot) when playing videos using xv(have not tried
> other options). It does happen somewhat intermittently, mostly if I
> play more than one video file in a row.

We don't know yet if this is unrelated.

Greg
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