gd->gen is not used in the latest code. If I remember, there was a bug
removing recent cached entries resulting in permission errors. What
version are you using? Try using V2.5.
Regards, Malahal.
On Sat, Mar 11, 2017 at 12:54 AM, Satya Prakash GS
<g.satyaprak...@gmail.com> wrote:
> On Sat, Mar 11, 2017 at 12:37 AM, William Allen Simpson
> <william.allen.simp...@gmail.com> wrote:
>> I'm not familiar with this code, so not likely to be much help.
>> Looks mostly written by Matt, but Malahal made the most recent
>> changes in July 2016.
>>
>> On 3/10/17 9:35 AM, Satya Prakash GS wrote:
>>>
>>> Is this a possibility :
>>>
>>> Server first rejects a client op with CREDPROBLEM/REJECTEDCRED,
>>> Client does an upcall and gssd initializes the context with the server.
>>> However the server recycles it immediately before the operation was
>>> retried (looks like there is a bug in the LRU implementation on
>>> Ganesha. To make things worse, I enabled the server debugs and it
>>> slowed down the client operations making the eviction of the entry
>>> easier). This happens thrice failing the client op.
>>>
>> Problem is not obvious.
>>
>> axp->gen is initialized to zero with the rest of *axp -- mem_zalloc().
>>
>> gd->gen is initialized to zero by alloc_svc_rpc_gss_data().
>>
>> axp->gen is bumped by one (++) each time it is handled by LRU code in
>> authgss_ctx_hash_get().
>>
>
> If a node gen isn't getting incremented it means that node is not
> being looked up often.
>
>> atomic_inc_uint32_t(&gd->gen) is immediately after that.
>>
>> You think gd->gen also needs to be set to axp->gen in _set()?
>>
>
>> I'm not sure they are related. There are many gd per axp, so
>> axp->gen could be much higher than gd->gen.
>>
>
> >From authgss_ctx_gc_idle ->
>
> if (abs(axp->gen - gd->gen) > __svc_params->gss.max_idle_gen) {
> Remove the entry from the tree; //gd is no more in the cache after this
> }
>
> Translates to - gd wasn't looked up in quite sometime let's clean it up.
>
> //gss.max_idle_gen -> by default set to 1024
>
> If tree's gen is 5000 and a new node gets inserted into the tree, node
> gen shouldn't start at 0 or it might pass the above condition in the
> next authgss_ctx_gc_idle call.
>
>> Both _get and _set are only called in svc_auth_gss.c _svcauth_gss().
>>
>> Admittedly, it is hard to track that there are 2 fields both called gen.
>>
>>> Thanks,
>>> Satya.
>>>
>>> On Thu, Mar 9, 2017 at 8:07 PM, Satya Prakash GS
>>> <g.satyaprak...@gmail.com> wrote:
>>>>
>>>> Looks like the gen field in svc_rpc_gss_data is used to check the
>>>> freshness of a context. However it is not initialized to axp->gen in
>>>> authgss_ctx_hash_set.
>>>> Will this not result in evicting the entries out early or am I missing
>>>> something ?
>>>>
>>>> Thanks,
>>>> Satya.
>>>>
>>>
>>>
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>>
>
> Thanks,
> Satya.
>
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