misc/172086: reboot hang with 'All buffers synced' after freebsd-update FreeBSD9 to p3 on ZFS root

[Marek]

>Number:         172086
>Category:       misc
>Synopsis:       reboot hang with 'All buffers synced' after freebsd-update FreeBSD9 to p3 on ZFS root
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Sep 26 08:50:06 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Marek
>Release:        9.0
>Organization:
none
>Environment:
default freebsd 9.0 install, generic kernel
(sorry, don't have access to machine at this time to fetch uname output).
>Description:
I have a problem with FreeBSD 9-RELEASE installed on ZFS mirror file system using tips from here:
http://wiki.freebsd.org/RootOnZFS/GP...ot/9.0-RELEASE


Immediately after installation I'm inovking:
# freebsd-update fetch
# freebsd-update install

Update is always successfull, but when I invoke:
# reboot / # shutdown -r / # halt / # poweroff / etc.

system will try to reboot, but will stop on the

All buffers synced

message.


The funny thing is that the server is responding to ping's, prints messages if I attach USB stick etc.


This problem doesn't take place if FreeBSD is installed "normally", on UFS.

Also it doesn't occurs when I remove 'world' from Components in /etc/freebsd-update.conf

(so the line looks like this):
Components src kernel

The problem also occurs when I invoke
# freebsd-update rollback


The interesting fact is that after invoking the 'freebsd-update fetch' we get list of files to be updated with information:

The following files will be updated as part of updating to 9.0-RELEASE-p4

but after reboot we've go the -p3 version.




---

I searched a lot, but found nothing related to freebsd-update.


Thank you for your time,
Marek
>How-To-Repeat:
The problem is very easy to reproduce:
Just create Virtual Machine in VirtualBox with two disks, install using instructions I have used (http://wiki.freebsd.org/RootOnZFS/GP...ot/9.0-RELEASE), after installation reboot, login as root, invoke:

# freebsd-update fetch
# freebsd-update install
# reboot
>Fix:


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