Softupdates not preventing lengthy fsck

[Don Lewis]

On 11 Apr, Kris Kennaway wrote:
> I'm seeing the following problem: on 6.0 machines which have had a lot
> of FS activity in the past but are currently quiet, an unclean reboot
> will require an hour or more of fscking and will end up clearing
> thousands of inodes:
> 
> [...]
> /dev/da0s1e: UNREF FILE I=269731  OWNER=root MODE=100644
> /dev/da0s1e: SIZE=8555 MTIME=Apr 18 02:29 2002  (CLEARED)

> /dev/da0s1e: UNREF FILE I=269741  OWNER=root MODE=100644
> [...]
> 
> It's as if dirty buffers aren't being written out properly, or
> something.  Has anyone else seen this?

This looks a lot like it could be a vnode refcnt leak.  Files won't get
removed from the disk while they are still in use (the old unlink while
open trick).  Could nullfs be a factor?