Re: Randomly rebooting FreeBSD 5.2.1 (Continued)

From: Martin Foster (martin_at_ethereal-realms.org)
Date: 06/28/04 

Date: Mon, 28 Jun 2004 01:51:35 GMT

Kris Kennaway wrote:
> On 2004-06-27, Martin Foster <martin@ethereal-realms.org> wrote:
>
>
>>In the previous threads, it was mentioned that a USB UPS was connected.
>> This has been disconnected and problems persist. At the moment only
>>the default bind server and PostgreSQL 7.4.x are running.
>>
>>Any ideas?
>
>
> It's probably panicking. Set up and obtain a crashdump (see the
> developer's handbook chapter on kernel debugging).
>
> Kris

Normally under OpenBSD a panic will not result in a 'reboot' or 'halt'
entry being placed in the last commands. That's what always puzzled me
on the matter.

However, I have kicked in the appropriate changes to have cores saved
when the system drops off. This should at least shed light on the matter.

However, there are two points that still confuse me since I am somewhat
new to FreeBSD. The first is related to rebooting, as in under OpenBSD
the default behavior is to simply crash to a debugger and wait for
things to handle itself there? Using a 'sysctl' command and setting it
to 'ddb.panic=1' will alleviate the problem. Does FreeBSD require such
a setting? Or is it automatic?

If reboots are automatic, what could cause the system to hang? I have
noticed that it attempts to synch before rebooting itself. Could this
cause problems or hiccups?

        Martin Foster
        Creator/Designer Ethereal Realms
        martin@ethereal-realms.org

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