URGENT: [diagnostic] cache_lock: blocked on 0xda5265a8 ""

[elekktretterr at exemail.com.au]

>
>     The server is still exporting /backup after the restart, before the
> stick
>     gets mounted?  That would definitely lead to problems because it would
>     suddenly be exporting a filesystem with a different FSID.
>
>     I should have time to reproduce this thing today and hopefully at
> least
>     make the clients return an I/O error.
>

Yes thats quite right. It also happend when i did the small test and
umounted the backup drive while still being exported to the clients, the
clients start getting stuck processes.

petr