race condition in the concurrency profiler (percept)?

Ahmed Omar <>
Mon Dec 13 18:05:26 CET 2010


Any feedback?

On Fri, Dec 10, 2010 at 2:27 PM, Ahmed Omar <> wrote:

> if you confirm it's a bug i can submit a patch supported with a test case
>
>
> On Fri, Dec 10, 2010 at 2:00 PM, Ahmed Omar <> wrote:
>
>> In percept_db, the function start/1 if it find an instance running , it
>> will send a message to stop the running db and spawn a process to start a
>> new one, which leads to a race condition.
>>
>> It can be reproduced with enough stress testing. But one way to easily
>> reproduce it, you can call percept:analyze/2 two subsequent times.
>>
>> 63> percept:analyze("test.dat").
>> Parsing: "test.dat"
>>
>> =ERROR REPORT==== 10-Dec-2010::13:52:46 ===
>> Error in process <0.252.0> with exit value:
>> {badarg,[{ets,new,[pdb_info,[named_table,private,{keypos,2},set]]},{percept_db,init_percept_db,0}]}
>>
>>
>> =ERROR REPORT==== 10-Dec-2010::13:52:46 ===
>> Error in process <0.253.0> with exit value:
>> {badarg,[{percept_db,insert,1},{percept,trace_parser,2},{dbg,tc_loop,3}]}
>>
>> {error,{badarg,[{percept_db,insert,1},
>>                 {percept,trace_parser,2},
>>                 {dbg,tc_loop,3}]}}
>>
>>
>> --
>> Best Regards,
>> - Ahmed Omar
>> http://nl.linkedin.com/in/adiaa
>> Follow me on twitter
>> @spawn_think <http://twitter.com/#!/spawn_think>
>>
>>
>
>
> --
> Best Regards,
> - Ahmed Omar
> http://nl.linkedin.com/in/adiaa
> Follow me on twitter
> @spawn_think <http://twitter.com/#!/spawn_think>
>
>


-- 
Best Regards,
- Ahmed Omar
http://nl.linkedin.com/in/adiaa
Follow me on twitter
@spawn_think <http://twitter.com/#!/spawn_think>


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