Re: [Boost-users] shared_ptr leaking memory and crashing / gcc 3.4.6

Subject: Re: [Boost-users] shared_ptr leaking memory and crashing / gcc 3.4.6
From: Michael (boost_at_[hidden])
Date: 2008-11-01 17:21:07

Peter Dimov wrote:
>> Anybody interested in this or could point me to a different boost list?
>>
>> Michael wrote:
>>> Hello,
>>>
>>> I figured that shared_ptr (boost 3.4, but I don't think this is 
>>> really a boost problem) will lose memory in the following example
> ...
>>> int main(int argc, char** argv)
>>> {
>>>   while (true)
>>>   {
>>>     XRef myX;
>>>     try
>>>     {
>>>       myX = getx();
>>>     }
>>>     catch(...)
>>>     {
>>>     }
>>>   }
>>> }
> ...
>>> Platform is FreeBSD 6, gcc 3.4.6. It only happens when compiled like 
>>> above (without optimization).
> 
> I'm interested in principle in everything concerning shared_ptr, but I'm 
> not sure what we can do about this specific case. Maybe report it to the 
> GCC Bugzilla? Is 3.4.6 even being maintained?
Thanks for your response.

I'm not certain if 3.4.6 is still maintained (the gcc site is not very 
specific about this), but since it is still shipped with some OSes as 
default I thought it might me worthwhile to put a warning somewhere in 
the boost documentation (sth like "known issues") to save somebody else 
from getting hit by this (in my case it was a server process crashing 
once a week for no apparent reason). Posting a bug at the gcc mailing 
list would only be an option if I can track this further down so I can 
report it without referring to boost (otherwise I'm pretty sure they 
will tell me to report this to the boost mailing list :). I don't know 
shared_ptr's internals (yet) and if this relates to something that is 
very specific to shared_ptr or a general issue that is easy to put in a 
small example case. So if you or anybody has a clue what might cause 
this I could try to get this to the gcc guys. If not, I would just 
suggest a warning in the documentation and hope that 3.4 won't be used 
by anybody in the near future.

/michael

> 
> -- 
> Peter Dimov
> http://www.pdplayer.com
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