OK, it's not a bug in the client but in the poller. One stream
(0x7fd0e4001070) is trying to send some data, and simultaneously another
stream (0x7fcfb80048b0) is being removed due to TTL expiration.
Andy, can you please have a look?
Alja, if it disturbs your testing you can temporarily switch to libevent
by playing with XRD_POLLERPREFERENCE envvar.
Cheers,
Lukasz
On 13.02.2014 10:17, Lukasz Janyst wrote:
> Strange. I took care to avoid just this kind of deadlock. I will have a
> look.
>
> Lukasz
>
> PS. for the future, please report these as issues on github.
>
> On 13.02.2014 07:09, Alja Mrak-Tadel wrote:
>> Hi,
>>
>> I'm running proxy server from the master branch and I consistently get a
>> dead lock after running jobs more than 15 min, e.g.,
>> http://uaf-2.t2.ucsd.edu/~alja/traffic.png
>>
>> The lock seems to be related to removing sockets in the client after
>> elapsing the XRD_DATASERVERTTL of the proxy. This is what I inferred
>> from debugging proxy with gdb (I picked a locked up thread and followed
>> the owners of contended locks):
>>
>> https://gist.github.com/alja/2e6a69c48f864cccf1d9#file-xrdcl-pollerbuiltin-removesocket-bt-txt-L12
>>
>> and server debug messages http://uaf-2.t2.ucsd.edu/~alja/proxy-lock.log
>> If I set the TTL high enough the proxy server can be 100% efficient and
>> stable.
>>
>> The lock is not simple to reproduce -- I'm running 600 jobs with 10%
>> probability of replicated file paths. The gcore after lock-up is in
>> noric38.slac.stanford.edu:/usr/work/matevz/gcore.12905
>>
>> Thanks,
>> Alya
>>
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