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Date:      Mon, 16 Mar 1998 23:49:21 -0600
From:      Karl Denninger  <karl@mcs.net>
To:        current@FreeBSD.ORG
Cc:        dyson@FreeBSD.ORG
Subject:   WARNING WILL ROBINSON! Risk of severe filesystem damage suspected
Message-ID:  <19980316234921.07586@mcs.net>

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************ URGENT **************

I strongly advise that you *DO NOT* use -CURRENT as it sits at the 
present time.

The kernel you build may do SEVERE damage to your filesystems.  

I am working on finding the commit which is causing this and will post to 
the list as soon as I have identified it.  

This is not a trivial matter.  It is a very good thing indeed that I use a
scratch disk for my /usr/obj area, or I would be really rather upset. :-)

The symptoms are random core dumps and other problems - but the underlying
reason is that the filesystem has been trashed beyond belief!  

I unmounted the disk in question CLEANLY and found both partially truncated 
and duplicate inodes all over it, along with severe internal file damage.

I suspect the commit today in kern/vfs_cluster.c, as that's the only
filesystem or VM related commit that my first-level examination has found.
I am backing that out locally right now and will advise if it makes the 
problem go away.

Note that kernels built LAST NIGHT (3/15) at about 23:00 *do not* exhibit 
the problem.

--
-- 
Karl Denninger (karl@MCS.Net)| MCSNet - Serving Chicagoland and Wisconsin
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