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Date:      Wed, 13 Aug 1997 11:10:47 +0930 (CST)
From:      Michael Smith <msmith@atrad.adelaide.edu.au>
To:        julian@FreeBSD.ORG (Julian Elischer)
Cc:        hackers@FreeBSD.ORG
Subject:   Re: 2.2.2+ crash.. more info
Message-ID:  <199708130140.LAA11047@genesis.atrad.adelaide.edu.au>
In-Reply-To: <199708130110.SAA21060@freefall.freebsd.org> from Julian Elischer at "Aug 12, 97 06:10:50 pm"

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Julian Elischer stands accused of saying:
> 
> We have several hundred Bsd machines here.. we see this one enough for
> me to recognise it..
> 
> the plot thickens..
> I have discovered the following:
> 1/ the code that crashes:
>   scanning the queues in swithc:

This looks a lot like the sort of crazy stuff I was seeing when I was
doing Verboten things inside a 'fast' ISA interrupt handler.  Do you have
RI_FAST set for any of your drivers, particularly ones that you've written
yourself?

You could try ripping RI_FAST out ouf _all_ of the handlers you're using
to start with and see if this cures things.

> code examinations will follow with more info..
> if this strikes anyone as familiar, do chime in!

Frighteningly.  It took us the best part of a year just to get a stack
trace that actually hinted at the problem.

> julian

-- 
]] Mike Smith, Software Engineer        msmith@gsoft.com.au             [[
]] Genesis Software                     genesis@gsoft.com.au            [[
]] High-speed data acquisition and      (GSM mobile)     0411-222-496   [[
]] realtime instrument control.         (ph)          +61-8-8267-3493   [[
]] Unix hardware collector.             "Where are your PEZ?" The Tick  [[



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