id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8395	Valgrind error in lockfree::queue	adam@…	timblechmann	"The following code


{{{
#include <boost/lockfree/queue.hpp>

int main()
{
        int i = 0;
        boost::lockfree::queue<int*> q(128);

        q.push(&i);
        q.push(&i);

        return 0;
}
}}}

compiled with

{{{
g++ -o test test.cpp -I/opt/boost/include
}}}

produces the following valgrind output 

{{{
==32040== Memcheck, a memory error detector
==32040== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==32040== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==32040== Command: ./test
==32040== 
==32040== Conditional jump or move depends on uninitialised value(s)
==32040==    at 0x401E77: boost::atomics::detail::base_atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::node>, void, 8u, false>::compare_exchange_strong(boost::lockfree::detail::tagged_ptr<boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::node>&, boost::lockfree::detail::tagged_ptr<boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::node> const&, boost::memory_order, boost::memory_order) volatile (in /tmp/test)
==32040==    by 0x401DD9: boost::atomics::detail::base_atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::node>, void, 8u, false>::compare_exchange_weak(boost::lockfree::detail::tagged_ptr<boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::node>&, boost::lockfree::detail::tagged_ptr<boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::node> const&, boost::memory_order, boost::memory_order) volatile (in /tmp/test)
==32040==    by 0x4019E0: boost::atomics::detail::base_atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::node>, void, 8u, false>::compare_exchange_weak(boost::lockfree::detail::tagged_ptr<boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::node>&, boost::lockfree::detail::tagged_ptr<boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::node>, boost::memory_order) volatile (in /tmp/test)
==32040==    by 0x40121C: bool boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::do_push<false>(int* const&) (in /tmp/test)
==32040==    by 0x400CF6: boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::push(int* const&) (in /tmp/test)
==32040==    by 0x40097E: main (in /tmp/test)
==32040== 
==32040== Conditional jump or move depends on uninitialised value(s)
==32040==    at 0x40121F: bool boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::do_push<false>(int* const&) (in /tmp/test)
==32040==    by 0x400CF6: boost::lockfree::queue<int*, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::push(int* const&) (in /tmp/test)
==32040==    by 0x40097E: main (in /tmp/test)
==32040== 
==32040== 
==32040== HEAP SUMMARY:
==32040==     in use at exit: 0 bytes in 0 blocks
==32040==   total heap usage: 129 allocs, 129 frees, 8,256 bytes allocated
==32040== 
==32040== All heap blocks were freed -- no leaks are possible
==32040== 
==32040== For counts of detected and suppressed errors, rerun with: -v
==32040== Use --track-origins=yes to see where uninitialised values come from
==32040== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 2 from 2)
}}}

This might be an issue with the atomic library, but I have not been able to track it further.

OS is Fedora F18 (3.8.3-203.fc18.x86_64)

G++ is g++ (GCC) 4.7.2 20121109 (Red Hat 4.7.2-8)

Valgrind is valgrind-3.8.1
"	Bugs	new	To Be Determined	lockfree	Boost 1.53.0	Problem