[ndnSIM] SIGSEGV when simply assigning one smart pointer to another?

[John Baugh]

This seems to imply a thread resource contention of some sort...  but I'm
hoping there is a resolution to this?

And what is causing the issue?  That would be the question.

On Tue, Apr 11, 2017 at 12:05 AM, John Baugh <jpbaugh at umich.edu> wrote:

> Ashlesh, Spyridon, and ndnSIM friends,
>
> As requested, the gdb output:
>
> jpbaugh at Janeway:~/ndnSIM/my-simulations$ gdb --args ./build/jpb-pop1
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> Reading symbols from ./build/jpb-pop1...done.
> (gdb) run
> Starting program: /home/jpbaugh/ndnSIM/my-simulations/build/jpb-pop1
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> Inside ctor for PStrat
> Inside ctor for PStrat
> Inside ctor for PStrat
> Inside ctor for PStrat
> In jpb-pop1 main: 0x7fffffffd6a0
> About to get forwarder
> Just got forwarder.  About to get strategy choice
> Just got strategy choice, about to get effectiveStrategy
> Just got effective strategy, about to set popularity manager for it.
> About to set Popularity Manager inside PStrat
> Before assignment line
>
>
>
>
>
> *Program received signal SIGSEGV, Segmentation
> fault.std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release
> (this=0x2710)    at /usr/include/c++/5/bits/shared_ptr_base.h:147147
> if (__gnu_cxx::__exchange_and_add_dispatch(&_M_use_count, -1) == 1)(gdb) *
>
>
>
>
> Thanks,
>
> John
>
> On Mon, Apr 10, 2017 at 8:53 PM, Spyridon (Spyros) Mastorakis <
> mastorakis at cs.ucla.edu> wrote:
>
>> Hi John,
>>
>> as Ashlesh mentioned, please post a gdb backtrace, so that we can take a
>> look.
>>
>> Thanks,
>>
>> Spyridon (Spyros) Mastorakis
>> Personal Website: http://cs.ucla.edu/~mastorakis/
>> Internet Research Laboratory
>> Computer Science Department
>> UCLA
>>
>> On Apr 10, 2017, at 1:20 PM, Ashlesh Gawande (agawande) <
>> agawande at memphis.edu> wrote:
>>
>> Perhaps you can post the gdb backtrace so that other people can take a
>> look.
>>
>> Ashlesh
>> ------------------------------
>> *From:* ndnSIM <ndnsim-bounces at lists.cs.ucla.edu> on behalf of John
>> Baugh <jpbaugh at umich.edu>
>> *Sent:* Monday, April 10, 2017 2:55:10 PM
>> *To:* ndnsim
>> *Subject:* Re: [ndnSIM] SIGSEGV when simply assigning one smart pointer
>> to another?
>>
>> I think maybe I'm mailing the list when no one is awake :)
>>
>> If anyone has any ideas, I'd be very interested in hearing them.  This is
>> a true Heisenbug
>>
>> On Apr 9, 2017 11:36 PM, "John Baugh" <jpbaugh at umich.edu> wrote:
>>
>>> Greetings all,
>>>
>>> I posted this question before but received no responses, so I figured
>>> I'd give it another shot.
>>>
>>> I've updated my Github repository with the updated code:
>>> profjpbaugh/ndnSIM-strategy1
>>>
>>> The scenario in question is *jpb-pop1*.  The offending code seems to be
>>> when I pass my PopularityManager object to a set method, and then do the
>>> actual assignment.  I created the PopularityManager as an adapter object
>>> (and go-between) between the PStrat (strategy) and the PopularityPolicy
>>> (policy).
>>>
>>> In order to establish my definition of "popularity", I require the
>>> interest information (which PStrat has), and to control caching /
>>> replacement ultimately (which is in PopularityPolicy), I need this
>>> information about interests.
>>>
>>> I am able to print (using cout) just before the assignment occurs, but
>>> it seems the segfault happens right then.
>>>
>>> I used GDB and it does indeed say there's a SIGSEGV, but I cannot for
>>> the life of me figure out why this is happening.  It happens if I try to
>>> set the data member (popularityManager) to anything.
>>>
>>> So I don't think it's the parameter (or argument) being passed in.
>>>
>>> Any assistance would be appreciated.  This may be some peculiar smart
>>> pointer issue, but I'm not sure.
>>>
>>>
>>> Thanks,
>>>
>>> John
>>>
>>
>>
>>
>
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