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Date:      Wed, 02 Dec 1998 23:59:49 -0800
From:      David Greenman <dg@root.com>
To:        "Jordan K. Hubbard" <jkh@zippy.cdrom.com>
Cc:        Steve Kargl <sgk@troutmask.apl.washington.edu>, bford@uop.cs.uop.edu, freebsd-current@FreeBSD.ORG
Subject:   Re: panic: ffs_blkfree: bad size 
Message-ID:  <199812030759.XAA17756@root.com>
In-Reply-To: Your message of "Wed, 02 Dec 1998 23:19:19 PST." <14136.912669559@zippy.cdrom.com> 

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>> sysctl -w vfs.ffs.doreallocblks=0
>> 
>> Is the correct response.
>
>Why isn't this currently the default if it's as pathological as you
>say?  Has anyone actually asked David this question?  It would be
>only courteous given that he's the author of this bug/feature.

   The feature is fairly important. Steve and one or two other people are
the only ones seeing the problem after Kirk's fix was committed. Steve is
the only person to report filesystem corruption caused by it. I'm not able
to reproduce the panic, despite doing more than 20 "make world"s in an
attempt to reproduce it. If we disable it by default then it will never get
fixed because there will be no feedback from people who are still having
problems with it. I WILL disable it prior to the 3.0.1 release if it isn't
fixed by then, however. Meanwhile I'll look at adding something that will
ensure that filesystem corruption isn't possible - I think this will amount
to detecting the problem and panicing earlier.

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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