Re: [Boost-users] crash in boost serialization (1.44)

Subject: Re: [Boost-users] crash in boost serialization (1.44)
From: Jeff Flinn (TriumphSprint2000_at_[hidden])
Date: 2010-12-10 07:48:02

Guy Prémont wrote:
> I had the same problem, i could pin point to the fact that when
> serialization is in a DLL, the i/oserializer and pointer_i/oserializer are
> created for each DLL that uses serialization of a class (and in the main exe
> if there is code there that uses serialization for this class). The
> singleton are always dll exported, never imported.
> 
> To make a long story short, in the serialization libs, the method
> basic_iarchive_impl::register_type(const basic_iserializer & bis) is called
> several times and may overwrite the bpis_ptr that was set earlier.
> 
> To fix this, I had to rebuild boost.serialization by and modify
> basic_iarchive.cpp.
> I changed the line:
> 	coid.bpis_ptr = bis.get_bpis_ptr();
> to
>      if (coid.bpis_ptr == 0) coid.bpis_ptr = bis.get_bpis_ptr();
> 
> But, there are a few issues with serialization methods when they are
> implemented inside a dll and called from outside.
> 
> Guy
> 
> --
> Guy Prémont, D.Sc.
> Architecte logiciel senior / Senior software architect
> CM Labs Simulations Inc. http://www.cm-labs.com/
> Tel. [phone] ext. 237 
>> -----Original Message-----
>> From: boost-users-bounces_at_[hidden] [mailto:boost-users-
>> bounces_at_[hidden]] On Behalf Of rico.cadetg_at_[hidden]
>> Sent: Wednesday, December 08, 2010 11:20 AM
>> To: boost-users_at_[hidden]
>> Subject: [Boost-users] crash in boost serialization (1.44)
>>
>> Hello,
>>
>> I’ve noticed a crash (accessing a null pointer) inside the boost
>> serialization (version 1.44). I use visual studio 2005, the code to
>> serialize is in a Dll. I have a small visual studio solution that
>> reproduces the crash, I guess it is a bug and should cause a crash in
>> other environments as well.
>>
>> I have the following classes
>>
>> INode (Interface)
>> Node (Abstract, derived from INode)
>> LeafNode(derived from Node)
>> TableNode(derived from Node)
>>
>> The TableNode has a list of INode*, the children. A TableNode itself
>> can be a child of a TableNode.
>>
>> All classes are inside a Dll and correctly exported (I have no
>> “unregistered class” exceptions).
>>
>> If I create a TableNode with some entries including another TableNode
>> and serialize it as an object, I get the crash when trying to
>> deserialize later. If I do the same, but serialize the parent TableNode
>> as a pointer, it works.
>>
>> I guess the serialization framework does not recognize that a TableNode
>> gets serialized through a pointer and therefore the object tracking
>> does not work correctly.
>>
>> I can send the example solution if needed.
>>
>> The crash is in the basic_iarchive.cpp, line 456 (bpis_ptr is null):
>> if(! tracking){
>>     bpis_ptr->load_object_ptr(ar, t, co.file_version);
>> }

Have you passed this on to Robert? Any downside to doing this?

Thanks, Jeff