kern/43799: NFS sillyrename causes transient failures

[pooka%iki.fi@localhost]

>Number:         43799
>Category:       kern
>Synopsis:       NFS sillyrename causes transient failures
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 25 18:15:00 +0000 2010
>Originator:     Antti Kantee
>Release:        
>Organization:
>Environment:
>Description:
Doing sillyrename in workqueue context causes transient failures
in unmount.  This is because the parent directories remain referenced
even after all user operations have returned.
>How-To-Repeat:
tests/fs/vfs/t_renamerace nfs_renamerace (remove sleep workaround
from the test)
>Fix: