Mount another Linux system (ocs3, 2.0.35) on NFS. Disconnect ocs3 from
the LAN. All attempts to getcwd() take ages with timeout messages :-
nfs: server ocs3 not responding, timed out
nfs_revalidate_inode: /// getattr failed, ino=1476395010, error=-5
shell-init: could not get current directory: getwd: cannot access parent directories
nfs: server ocs3 not responding, timed out
nfs_revalidate_inode: /// getattr failed, ino=1476395010, error=-5
job-working-directory: could not get current directory: getwd: cannot access parent directories
getcwd() runs up the directory tree, if its search algorithm crosses
the disconnected NFS mount point it tries to access the remote system.
Not good when a remote system drops off, even users who are not using
ocs3 directories are hit. Lots of tasks invoke getcwd().
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