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Date:      Fri, 29 Nov 2002 16:02:47 +0100
From:      Poul-Henning Kamp <phk@critter.freebsd.dk>
To:        Wesley Morgan <morganw@chemikals.org>
Cc:        current@FreeBSD.ORG
Subject:   Re: Harry Potter and the Disappearing Disklabel 
Message-ID:  <1515.1038582167@critter.freebsd.dk>
In-Reply-To: Your message of "Fri, 29 Nov 2002 09:41:56 EST." <20021129093417.V7358-100000@volatile.chemikals.org> 

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In message <20021129093417.V7358-100000@volatile.chemikals.org>, Wesley Morgan 
writes:
>Yesterday morning I was having some trouble with XFree consuming much more
>cpu time than necessary... A truss showed that some kind of shared memory
>issue going on, but also froze my system hard. After rebooting (kernel was
>from Nov 26 or 27) fsck could not check my one dirty UFS2 partition. Had
>to newfs and mtree to recreate /var. No big deal, and I saved an image of
>it beforehand.
>
>After rebooting, there was... NOTHING. GRUB errored out and wouldn't boot.
>Nothing could see my partitions. After a minimal 4.7-R install (DP2
>disklabel whined about offsets and some other STRANGE error messages,
>so I went with 4.7) on a small fat32 partition, I discovered that the
>disklabel was empty. Had to edit it by hand... Booted up fine, made
>a backup, rebooted, and nothing. Not only was there NOTHING, but the
>disklabel on the new 4.7 install had vanished as well. This time the
>disklabel had to be recreated with -w -r AND the boot blocks had to be
>reinstalled.
>
>I've seen one post similar to this, but not much else. I think maybe the
>UFS2 problem had to do with Kirk's recent changes, but the disklabel
>issue... I'm wary to reboot my machine! What in the hell could be causing
>this? I'm tempted to point the finger at GEOM, but hate to say anything
>like that.

I have absolutely no idea how this can happen, and would really
appreciate if people can try to find a way to reproduce it, I've
tried today and couldn't :-(

-- 
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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