kern/58154: Snapshots prevent disk sync on shutdown

[David Gilbert]

>Number:         58154
>Category:       kern
>Synopsis:       Snapshots prevent disk sync on shutdown
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Oct 16 18:40:12 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator:     David Gilbert
>Release:        FreeBSD 5.1-CURRENT i386
>Organization:
daveg.ca
>Environment:
System: FreeBSD canoe.dclg.ca 5.1-CURRENT FreeBSD 5.1-CURRENT #1: Tue Oct 7 16:54:59 EDT 2003 dgilbert at canoe.dclg.ca:/usr/src/sys/i386/compile/CANOE i386


-CURRENT, cvsup-d as above.  Centrino 1.6 in a laptop (Dell D800), 1G
RAM, 60G drive with 2G swap.
>Description:
When a sufficiently large partition (mine's 55G) contains more than
one snapshot, a shutdown -h now will not sync the disk.  The output
of 'syncing disks' never counts down.  This works fine with one
snapshot ... but not with more.  Small partitions (my other partition is
256M) don't appear to exhibit this problem.
>How-To-Repeat:
I create snapshots once per day on both / and /usr on my laptop.  If more
than one snapshot exists on /usr, this problem occurs.
>Fix:

None known to me.


>Release-Note:
>Audit-Trail:
>Unformatted: