misc/157365: [nfs] cannot umount an nfs from dead server

[Eugene M. Zheganin]

>Number:         157365
>Category:       misc
>Synopsis:       [nfs] cannot umount an nfs from dead server
>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 May 27 08:10:09 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Eugene M. Zheganin
>Release:        8.2-RELEASE
>Organization:
Norma LLC.
>Environment:
FreeBSD omega.norman-neva.spb.ru 8.2-RELEASE FreeBSD 8.2-RELEASE #2: Fri Apr 22 10:40:22 MSD 2011     emz at omega.norman-neva.spb.ru:/usr/obj/usr/src/sys/SPB-HA  amd64
>Description:
cannot umount an nfs from dead server.

umount hangs indefinitely. so does umount -f.
>How-To-Repeat:
Mount an FNS resource, disconnect the server from the network, try to umount resource.
>Fix:
Bring the server back from the dead or simply go back in time. Or reboot. Sometimes going back in time is more likely since reboot is not even possible.

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