Re: [boost] boost::thread segfault

From: Phil Endecott (spam_from_boost_dev_at_[hidden])
Date: 2008-01-28 12:31:41

James Sutherland wrote:
> On 1/26/08 10:32 AM, "Phil Endecott" <spam_from_boost_dev_at_[hidden]>
> wrote:
>> James Sutherland wrote:
>>> I am getting segmentation violations from inside of boost::thread
>>> 
>>> Running valgrind, I get the following:
>>>> ==31129== Thread 2:
>>>> ==31129== Jump to the invalid address stated on the next line
>>>> ==31129==    at 0xEC834853E5894855: ???
>>>> ==31129==    by 0x4A4DDE1: boost::function0<void,
>>>> std::allocator<boost::function_base> >::function0(boost::function0<void,
>>>> std::allocator<boost::function_base> > const&) (function_template.hpp:527)
>>>> ==31129==    by 0x4A4CF21: thread_proxy (thread.cpp:106)
>>>> ==31129==    by 0x31A0D06136: start_thread (in
>>>> /lib64/tls/libpthread-2.3.4.so)
>>>> ==31129==    by 0x31A04C7532: clone (in /lib64/tls/libc-2.3.4.so)
>> 
>> Is this the "non-thread-safe-threads" bug?  Have you upgraded your
>> Boost.Function per the instructions at http://boost.org/ ?  Are you
>> creating several threads at nearly the same time?  Does this only ever
>> happen when the first few threads are created?  What compiler are you using?
>
> I have not upgraded Boost.Function (I am running version 1.34.0).  Is there
> a potential problem there that could be causing this?

Yes, see http://boost.org/.

> I am spawning several
> threads concurrently, but the segfault consistently occurs while creating
> the first thread.  I am using gcc 3.4.6.

I'm guessing that gcc introduced its thread-safe statics feature 
sometime after 3.4.6, but I don't know that.

I think this is consistent with the "non-thread-safe-threads" bug.  
Either upgrade your Boost.Function per the instructions at 
http://boost.org/, or use a newer g++ with thread-safe statics (it will 
probably have other improvements too), or wait for a boost release that 
includes this fix.

Phil.