Ceph high cpu in encoding

#0  0x0000000000655f19 in ceph::buffer::list::iterator::advance(unsigned int) ()
#1  0x0000000000656d81 in ceph::buffer::list::copy_in(unsigned int, unsigned int, char const*) ()
#2  0x00000000006b0495 in hobject_t::encode(ceph::buffer::list&) const ()
#3  0x0000000000530ef9 in ReplicatedPG::remove_object_with_snap_hardlinks(ObjectStore::Transaction&, hobject_t const&) ()
#4  0x000000000053141e in ReplicatedPG::clean_up_local(ObjectStore::Transaction&) ()
#5  0x0000000000746ec9 in PG::activate(ObjectStore::Transaction&, std::list<Context*, std::allocator<Context*> >&, std::map<int, std::map<pg_t, pg_query_t, std::less<pg_t>, std::allocator<std::pair<pg_t const, pg_query_t> > >, std::less<int>, std::allocator<std::pair<int const, std::map<pg_t, pg_query_t, std::less<pg_t>, std::allocator<std::pair<pg_t const, pg_query_t> > > > > >&, std::map<int, MOSDPGInfo*, std::less<int>, std::allocator<std::pair<int const, MOSDPGInfo*> > >*) ()
#6  0x0000000000749fe3 in PG::RecoveryState::Active::Active(boost::statechart::state<PG::RecoveryState::Active, PG::RecoveryState::Primary, boost::mpl::list<mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, (boost::statechart::history_mode)0>::my_context) ()
#7  0x0000000000763837 in boost::statechart::detail::safe_reaction_result boost::statechart::simple_state<PG::RecoveryState::Peering, PG::RecoveryState::Primary, PG::RecoveryState::GetInfo, (boost::statechart::history_mode)0>::transit_impl<PG::RecoveryState::Active, PG::RecoveryState::RecoveryMachine, boost::statechart::detail::no_transition_function>(boost::statechart::detail::no_transition_function const&) ()
#8  0x0000000000763e02 in boost::statechart::simple_state<PG::RecoveryState::Peering, PG::RecoveryState::Primary, PG::RecoveryState::GetInfo, (boost::statechart::history_mode)0>::react_impl(boost::statechart::event_base const&, void const*) ()
#9  0x0000000000763f7a in boost::statechart::simple_state<PG::RecoveryState::WaitUpThru, PG::RecoveryState::Peering, boost::mpl::list<mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, (boost::statechart::history_mode)0>::react_impl(boost::statechart::event_base const&, void const*) ()
#10 0x000000000075e14b in boost::statechart::state_machine<PG::RecoveryState::RecoveryMachine, PG::RecoveryState::Initial, std::allocator<void>, boost::statechart::null_exception_translator>::process_event(boost::statechart::event_base const&) ()
#11 0x000000000071b24c in PG::RecoveryState::handle_activate_map(PG::RecoveryCtx*) ()
#12 0x00000000005d5fe4 in OSD::activate_map(ObjectStore::Transaction&, std::list<Context*, std::allocator<Context*> >&) ()
#13 0x00000000005e1fb0 in OSD::handle_osd_map(MOSDMap*) ()
#14 0x00000000005e3c8b in OSD::_dispatch(Message*) ()
#15 0x00000000005e425f in OSD::ms_dispatch(Message*) ()
#16 0x00000000006bfd5a in SimpleMessenger::dispatch_entry() ()
#17 0x00000000005111dd in SimpleMessenger::DispatchThread::entry() ()
#18 0x00007f7260d088ca in start_thread () from /lib/libpthread.so.0
#19 0x00007f725f38c92d in clone () from /lib/libc.so.6
#20 0x0000000000000000 in ?? ()