[OpenAFS] enobufs, "No buffer space available" messages

[Jeffrey Altman]

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Since the client is 1.6.5, a newer client will alter the error message
but not the behavior.  If the file server concludes that the connection
has stalled (been idle) for too long, it will terminate it with a
VNOSERVICE abort code.

If the VNOSERVICE is reproducible when performing an "unlink" operation
on a lock file, that might indicate some other problem.

 * Is the lock file one that would be in use by other cache managers?

 * How contended would the directory containing the lock file be?

VNOSERVICE errors should not be result of a failure of the file server
to send callback messages to cache managers other than the one
requesting the change.  I'm suspicious of a VNOSERVICE reliably being
returned on an unlink operation because the RPC issues the request in a
single packet and sends the result in a single packet.  The idle
detection code is supposed to be engaged if a call is started and all of
the data required to perform the call fails to arrive.

If this behavior can be reliably reproduced it would be useful to
examine a tcpdump of the rx traffic on the file server that is issuing
the VNOSERVICE abort.

Jeffrey Altman


On 7/12/2014 12:57 PM, Renata Maria Dart wrote:
> Hi Jeff, the client is 1.6.5.
>=20
> Renata
>=20
> On Fri, 11 Jul 2014, Jeffrey Altman wrote:
>=20
>> Since 1.6.5 a change was made to the client to translate the VNOSERVIC=
E
>> error to ETIMEDOUT.  That doesn't change any behavior but it results i=
n
>> a more reasonable error message being reported.  (VNOSERVICE has the
>> same numeric value as ENOBUFS.)
>>
>> In 1.6.2 a change was made to the client to treat a VNOSERVICE error a=
s
>> a condition which permits a retry of the operation.  However as the
>> e-mail thread you quoted from indicates, doing so is not always safe.
>>
>> What version is the client?
>>
>> Jeffrey Altman



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