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Date:      Wed, 17 Jan 2001 20:47:48 +0100
From:      Poul-Henning Kamp <phk@critter.freebsd.dk>
To:        John Baldwin <jhb@FreeBSD.org>
Cc:        current@FreeBSD.org, arch@FreeBSD.org, Randell Jesup <rjesup@wgate.com>, Soren Schmidt <sos@freebsd.dk>, Alfred Perlstein <bright@wintelcom.net>
Subject:   Re: HEADS-UP: await/asleep removal imminent 
Message-ID:  <54340.979760868@critter>
In-Reply-To: Your message of "Wed, 17 Jan 2001 10:55:09 PST." <XFMail.010117105509.jhb@FreeBSD.org> 

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In message <XFMail.010117105509.jhb@FreeBSD.org>, John Baldwin writes:
>
>On 17-Jan-01 Poul-Henning Kamp wrote:
>> 
>>>Perhaps you can explain how you're able to trigger this instability
>>>with a test script?  Poul-Henning told me he just needed to do a
>>>make -j256 world, I did 10 of them without a problem...
>> 
>> Then you misunderstood me, I don't have anything in the dept
>> of SMP hw which can trigger it.
>
>Ok, what _does_ trigger this then?

My theory is that it's related to disk-IO.

My guess is that it may be related to calling a *_strategy()
routine from an interrupt routine.   That is what sets ccd,
ata-raid and vinum apart from normal disk-IO.

--
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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