Agent crash @FlowMgmtManager::EnqueueUveAddEvent

full core : 10.84.5.112:/cs-shared/bugs/<bug-id>/

Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/contrail-vrouter-agent'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 __memcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S:36
#0 __memcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S:36
#1 0x00007fc7accd1df0 in std::string::_Rep::_M_clone(std::allocator<char> const&, unsigned long) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#2 0x00007fc7accd244c in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3 0x0000000000c17308 in FlowMgmtManager::EnqueueUveAddEvent(FlowEntry const*) const ()
#4 0x0000000000c17694 in FlowMgmtManager::LogHandler(boost::shared_ptr<FlowMgmtRequest>) ()
#5 0x0000000000c1b9dc in boost::detail::function::function_obj_invoker1<boost::_bi::bind_t<bool, boost::_mfi::mf1<bool, FlowMgmtManager, boost::shared_ptr<FlowMgmtRequest> >, boost::_bi::list2<boost::_bi::value<FlowMgmtManager*>, boost::arg<1> > >, bool, boost::shared_ptr<FlowMgmtRequest> >::invoke(boost::detail::function::function_buffer&, boost::shared_ptr<FlowMgmtRequest>) ()
#6 0x0000000000c21f44 in QueueTaskRunner<boost::shared_ptr<FlowMgmtRequest>, WorkQueue<boost::shared_ptr<FlowMgmtRequest> > >::RunQueue() ()
#7 0x0000000001186b3c in TaskImpl::execute() ()
#8 0x00007fc7acf3bb3a in ?? () from /usr/lib/libtbb.so.2
#9 0x00007fc7acf37816 in ?? () from /usr/lib/libtbb.so.2
#10 0x00007fc7acf36f4b in ?? () from /usr/lib/libtbb.so.2
#11 0x00007fc7acf330ff in ?? () from /usr/lib/libtbb.so.2
#12 0x00007fc7acf332f9 in ?? () from /usr/lib/libtbb.so.2
#13 0x00007fc7ad157182 in start_thread (arg=0x7fc7a4df0700) at pthread_create.c:312
#14 0x00007fc7ac43047d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111