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Subject: Re: [Boost-users] [Boost Serialization] crashing use case about serialization using pointers to objects of an abstract derived class using two DLLs
From: François Mauger (mauger_at_[hidden])
Date: 2011-06-13 17:54:39


Thank you Robert for the fast reply and the hint.
I've just checkout the trunk and built it.
Now I link against 1.47 and my use case ran without
apparent problem.
Of course it needs more tests to validate a production approach
for my DLLs but it is very encouraging after weeks/months of struggle
to setup this multi DLL approach.

It seems the code that you have modified/fixed is the
'void_caster::recursive_unregister()' method in 'void_cast.cpp'
where there was some possibly double deletion occurence, depending on
how the set was filled.

If I copy the fix in the 1.44 source, is it supposed to work, or is
there other stuff to be modified ?


 >>> On 13/06/2011 18:42, Robert Ramey wrote:
> François Mauger wrote:
>> Basically, the bits attached in the zip file work (under Linux/gcc,
>> 4.X
>> and Boost 1.44) BUT there is still one problem:
>> one of the sample executable badly segfaults while terminating,
>> probably
>> at some singleton termination (however it is just a feeling).
>> Here is a GDB dump:
>>   >>>
>>      from
>> /scratch/sw/boost/install-1_44_0-Linux-i686-gcc45/lib/
>> #6  0x001aac6b in
>> boost::serialization::void_cast_detail::void_caster_primitive<A::c1,
>> A::base>::~void_caster_primitive() () from ./lib/
>> #7  0x001aaced in
>> boost::serialization::detail::singleton_wrapper<boost::serialization::void_cast_detail::void_caster_primitive<A::c1,
>> A::base>  >::~singleton_wrapper() () from ./lib/
>> #8  0x00389e14 in __cxa_finalize () from /lib/i386-linux-gnu/
>> #9  0x001a02b4 in __do_global_dtors_aux () from ./lib/
>> #10 0x001adab0 in _fini () from ./lib/
>> #11 0x0011ec3d in ?? () from /lib/
>> #12 0x00389a6f in ?? () from /lib/i386-linux-gnu/
>> #13 0x00389acf in exit () from /lib/i386-linux-gnu/
>> #14 0x00370e3f in __libc_start_main () from
>> /lib/i386-linux-gnu/
>> #15 0x08048b41 in _start ()
>> <<<
> We have recently made some some small changes which I believe
> may address this.  The changes have been checked into the trunk
> and release branches so should appear in 1.47.  It would be valueable
> for you to test the most recent release version to see if I'm correct on
> this.
>> The funny thing (however likely relevant) is that this program does
>> NOT use serialization; it is just linked against DLLs with embedded
>> serialization code. It encounters some kind of side-effect. All the
>> executable that use serialization code from both DLLs work fine and we
>> get the proper serialization/deserialization actions. Also this
>> problem
> Correct.  This is an effect of "registering" the derived types which
> occurs whenever the DLL is loaded.  Since the process of loading
> a DLL is the same regardless of whether the included functions are
> called or not, this problem would still manifest itself.
>> does not occur when the inheritance scheme of serializable class has
>> only one level (see README in the zip file).
>> As it is a rather complex problem which turns to be only demonstrated
>> given a full multi-DLLs skeleton package, the attached ZIP provides
>> all  the source code and a README file that explains how the DLLs are
>> designed and used. There are build instructions and scripts too (for
>> Linux).
> I think we're ahead of you on this.  Turns out that this area is a minefield
> which is much more subtle than it first appears.  On the upside, several
> good people have taken an interest and progress is (slowly) being made.
> Robert Ramey
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
François Mauger
   Groupe "Interactions Fondamentales et Nature du Neutrino"
   NEMO-3/SuperNEMO Collaboration
Département de Physique -- Université de Caen Basse-Normandie
   Laboratoire de Physique Corpusculaire de Caen (UMR 6534)
   6, Boulevard du Marechal Juin
   14050 CAEN Cedex
Courriel/e-mail: mauger_at_[hidden]
Tél./phone:      02 31 45 25 12 / (+33) 2 31 45 25 12
Fax:             02 31 45 25 49 / (+33) 2 31 45 25 49

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