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Date:      Tue, 3 Nov 1998 12:40:55 -0500 (EST)
From:      Alfred Perlstein <bright@hotjobs.com>
To:        Marius Bendiksen <Marius.Bendiksen@scancall.no>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: df hangs on 2.2.6-BETA
Message-ID:  <Pine.BSF.4.05.9811031235150.10124-100000@porkfriedrice.ny.genx.net>
In-Reply-To: <3.0.5.32.19981103180944.0096b210@mail.scancall.no>

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On Tue, 3 Nov 1998, Marius Bendiksen wrote:

> 
> I was thinking more along the lines of a generic mechanism for killing
> *any* part of the system which has gotten hung up on something.

I'm only aware of this becoming a problem in two areas:

1) NFS without intr
2) the stupid ATAPI driver (it doesn't do a real reset and hangs 
processes)

Some places might be changed to allow this, but other places it just can't
without major design changes.  Sometimes waiting for a resource is a good
thing.

Generally a lot of provisions are made to make sure kill -9 works in all
cases, perhaps with a small delay for entry/exit into the kernel.

What process specifically hangs for you?  only df?  is it the NFS issue?

you can also configure NFS to pass back an error on a certain timeout of
waiting.  however this causes problems when coders don't expect what they
think are "local" files to return such errors on access.

> .oO[¨ Marius Bendiksen ¨]Oo.
>   Dead girls don't say no.
> 

I hope that's some sort of literary referance. yuk.

Alfred Perlstein - Programmer, HotJobs Inc. - www.hotjobs.com
-- There are operating systems, and then there's FreeBSD.
-- http://www.freebsd.org/                        3.0-current


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