I just saw something strange: systat bufcache showed a large number of
buffers, some 90% of total, in use for /scratch2, a partition that
should not be in use. I do my building with pkg_comp there with union
mounts. It also has softdeps. The last time I used pkg_comp was several
days ago.

So I tried to force out those buffers by unmounting it, which failed
(busy). I didn't believe it, so I tried unmount -f. This hung my machine
for at least 15 seconds; I was remote and I already feared that it had
crashed. However after that the unmount was successful and the buffers
were no longer shown as in use.

So I wonder: could there be some circular dependency in softdep data,
perhaps caused by union mounts, that prevented the disk from being
updated? (this is with 2.0)

I wonder if a similar scenario happened the one time I had significant
data loss on another /scratch partition...

-Olaf.
-- 
___ Olaf 'Rhialto' Seibert                            --  rhialto/at/falu.nl
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