bin/129760: after 'umount -f' of a stale NFS share FreeBSD locks up

Eugene M. Zheganin emz at
Fri Dec 19 04:40:01 PST 2008

>Number:         129760
>Category:       bin
>Synopsis:       after 'umount -f' of a stale NFS share FreeBSD locks up
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Dec 19 12:40:00 UTC 2008
>Originator:     Eugene M. Zheganin
>Release:        7.1-PRERELEASE
Norma JSC.
FreeBSD 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #0: Tue Dec 16 16:23:33 YEKT 2008     emz at  i386
I got a FreeBSD with some NFS shares mounted from the network. I decided to change its IP but forgot to umount NFS shares.

When trying to 'umount /mountpoint-of-a-nfs-share' without -f I got mount hanged up infinitely.
After successful umount -f I got the inability to log in via ssh, hanged up midnight commander, and 'reboot', issued from local console also hanged up. (Probably some other side effects had place too).

Repeat similar actions.


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