I am trying to upgrade a 1.3_ALPHA system to the BETA snapshot of Dec 16. 
The upgrade script fails when  'chroot /mnt fsck -f -p'  finds errors

/dev/wd0a: INCORRECT  BLOCK COUNT I=3984 (2128 should be 208) (CORRECTED) 
/dev/wd0a: FREE BLK COUNT(S) WRONG IN SUPERBLK (SALVAGED)
/dev/wd0a: BLK(S) MISSING IN BIT MAPS (SALVAGED)
/dev/wd0a: SUMMARY INFORMATION BAD (SALVAGED)

and segfaults when checking the root partition. I can avoid the problem by 
adding a 'sync' command to the upgrade script after it copies the new fsck 
to /mnt/sbin, right before remounting / ro.  

When running the same sequence of commands 'upgrade' runs by hand the 
problem does not occur - looks like the typing time is enough to flush all dirty 
blocks to disk before root is re-mounted ro.

Is the a generic problem, ie should mount sync the fs before re-mounting it 
ro? 

-- 
Andreas Wrede              Planix, Inc.
andreas@planix.com         Networking, System Administration, Consulting
http://www.planix.com      Toronto, Ontario, Canada