VERY frustrated with FreeBSD/UFS stability - please help or comment...

[Rick C. Petty]

On Mon, May 21, 2007 at 04:39:39PM -0400, Kris Kennaway wrote:
> On Mon, May 21, 2007 at 03:35:56PM -0500, Rick C. Petty wrote:
> > 
> > Hmm, this recently happened to me in 6.2-STABLE.  I was unable to replicate
> > it so filing a PR was pointless.  What I saw happen was that /usr filled up
> > completely (I caught it before it hit 100% full, but watched helplessly as
> > it switched from time to space optimization).  I even did a "du -hd0 /usr"
> > and saw it only using about 20% of the file system.  lsof and fstat weren't
> > terribly helpful.  After shutting down to single-user mode, I saw it full
> > even though I deleted a lot of superfluous files, and du/df differences
> > were still present.  I restarted and fsck cleaned up the 80% "used" space,
> > stating the superblock free maps were incorrect, which explains the
> > discrepency.  Why it happened, I'm still baffled.
> 
> OK, it may be that the bug is still around in some form, or it could
> be a different issue.  One thing to check is whether you have a
> snapshot active, because this will cause a very similar behaviour.

I don't use snapshots, except for bgfsck, which wasn't necessary because
everything preened clean.

Like I said, it would be difficult to chase down.  I should probably just
enable kernel DDB in case it happens again.

-- Rick C. Petty