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Date: Wed, 04 Aug 2004 15:34:49 -0600
From: Scott Long <scottl@freebsd.org>
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To: Geoff Speicher <geoff@speicher.org>
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cc: Jeremy Chadwick <freebsd@jdc.parodius.com>
cc: current@freebsd.org
Subject: Re: Postgresql locks up server - no response at all
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Geoff Speicher wrote:

> On Wed, Aug 04, 2004 at 04:19:20PM -0500, Jon Noack wrote:
> 
>>On 08/04/04 15:34, Jeremy Chadwick wrote:
>>
>>>Many people over in freebsd-threads mentioned this problem, and recommended
>>>all sorts-of different workarounds.  I tried every one available to me,
>>>except mucking with PREEMPTION (as I did not feel comfortable tinkering
>>>with a random .h file on the box; seemed to be a kernel-related thing,
>>>so I'd rather have just an "options" line for it -- I'm conditionally
>>>lazy).
>>
>>The one you didn't try most likely was the culprit.  Robert Watson 
>>showed that PREEMPTION and threading don't play well together right now:
> 
> 
> FWIW, in mid-late July, my problems were not PREEMPTION-related.  I
> tried everything I could to get usable threaded apps under XFree86, but
> my Athlon XP rebooted every time I tried to run kdm, Firefox, etc.
> 
> This included all four combinations of PREEMPTION and ULE/4BSD.  Rolling
> back to July 1 was the only thing that worked for me.
> 
> Geoff
> 

Yeah, the instant reboots have hit me too.  Disabling PREEMPTION did
seem to help this for me, but then it might have been a coincidence.
Incidentally, what video drivers are you using?

Scott