We saw today the same error on our linux boxes after a takeover has been executed on the netapp heads.
All mountpoints we're visible as "/mountpoint (deleted)" in /proc/mounts - however the mountpoints were still usable but couldn't be unmounted without the /etc/mtab workaround (add \040(deleted) to the end of mount path).
Uname -a:
Linux <hostname>-3 3.2.0-49-generic #75-Ubuntu SMP Tue Jun 18 17:39:32 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
We saw today the same error on our linux boxes after a takeover has been executed on the netapp heads.
All mountpoints we're visible as "/mountpoint (deleted)" in /proc/mounts - however the mountpoints were still usable but couldn't be unmounted without the /etc/mtab workaround (add \040(deleted) to the end of mount path).
Uname -a:
Linux <hostname>-3 3.2.0-49-generic #75-Ubuntu SMP Tue Jun 18 17:39:32 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux