[OpenAFS] many packet are as rx_ignoreAckedPacket and meltdown

[Jeffrey Altman]

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Michal Svamberg wrote:
> I have a question about this problem, do you consider about new option
> with maximum clients with the same UUID that can connected to
> fileserver? Or write warning message to FileLog (without debug)?
> By my opinion it is not good if clients are able to shutdown a server.

If you have 100 clients with the same UUID as far as the file server
is concerned, they are the same client that just happens to be
multi-homed with 100 address-port combinations.

The whole point of the UUID is to provide a unique identifier for
each client.  If you are distributing clients that are all manually
configured to use the same UUID, that is an administrative problem.

The specific problem that you have run into is that your clients have
registered more callbacks via FetchStatus calls then can be maintained
by the file server in the callbacks table.  The file server is therefore
searching for a callback that can be deregistered.  It doesn't want to
deregister a callback from the same host that is attempting to register
a new one because doing so could produce a feedback loop.  Unfortunately
because all of your clients have the same UUID, there is only one host
entry and there are no other hosts from which callbacks can be
deregistered.  The answer is not to place a limit on the number of
address-port values that can be associated with a host.  Doing so would
adversely impact clients behind NATs or that migrate across networks
that dynamically assign IP addresses.

The answer is to fix the clients.

Jeffrey Altman

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