kern/188754: GEOM Problem: gmirror gm0 destroyed on shutdown

[Mikhail]

>Number:         188754
>Category:       kern
>Synopsis:       GEOM Problem: gmirror gm0 destroyed on shutdown
>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:   Fri Apr 18 10:40:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Mikhail
>Release:        8.3-RELEASE
>Organization:
GlobalTel
>Environment:
FreeBSD as4new.globaltel.ru 8.3-RELEASE FreeBSD 8.3-RELEASE #0: Mon Apr  9 21:47:23 UTC 2012     root at almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386


>Description:
There are two disk ( 465GB), mirroring is configured by means of gmirror.
After sync:

as4new# gmirror list
Geom name: gm0
State: COMPLETE
Components: 2
Balance: round-robin
Slice: 4096
Flags: NONE
GenID: 0
SyncID: 11
ID: 1161288843
Providers:
1. Name: mirror/gm0
Mediasize: 500107861504 (465G)
Sectorsize: 512
Mode: r5w5e14
Consumers:
1. Name: ad4
Mediasize: 500107862016 (465G)
Sectorsize: 512
Mode: r1w1e1
State: ACTIVE
Priority: 0
Flags: NONE
GenID: 0
SyncID: 11
ID: 2104388952
2. Name: ad6
Mediasize: 500107862016 (465G)
Sectorsize: 512
Mode: r1w1e1
State: ACTIVE
Priority: 0
Flags: NONE
GenID: 0
SyncID: 11
ID: 2687380763

as4new# gmirror status
Name Status Components
mirror/gm0 COMPLETE ad4 (ACTIVE)
ad6 (ACTIVE)

After restarting, the system displays an error: GEOM: gmirror gm0 destroyed.
Then follows a cyclic reboot in 15 seconds.
>How-To-Repeat:
Reboot server
>Fix:
To boot only possible when one of the disks.
After loading the server again is syncing disks.

What could be the problem?

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