how to diagnose server freeze with ddb?

Lowell Gilbert freebsd-questions-local at
Fri May 13 17:01:03 UTC 2011

cronfy <cronfy at> writes:

> I have a server that freezes under high load sometimes. It is on
> FreeBSD 7.3. It does not respond neither by network nor to keyboard.
> In the same time I can hit Ctrl-Alt-ESC and go to debugger - it works.
> What can I try to do in DDB to find out the reason of server freezing?

There are a lot of ddb(4) commands that show the state of the system,
and there isn't a lot to go on here.  "show locks", "show alllocks", 
"show intr", "show pcpu" are some of the commands that occur to me as
ones I would look at first.

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