diff --git a/libtorrent/bindings/python/src/docstrings.cpp b/libtorrent/bindings/python/src/docstrings.cpp
index f2aa7bfd0..0fa001f39 100755
--- a/libtorrent/bindings/python/src/docstrings.cpp
+++ b/libtorrent/bindings/python/src/docstrings.cpp
@@ -177,8 +177,6 @@ char const* session_start_natpmp_doc =
     "";
 char const* session_stop_natpmp_doc =
     "";
-char const* session_wait_for_alert_doc =
-    "";
     
 // -- alert -----------------------------------------------------------------
 
diff --git a/libtorrent/bindings/python/src/session.cpp b/libtorrent/bindings/python/src/session.cpp
index 1b9f0ffc3..481348730 100755
--- a/libtorrent/bindings/python/src/session.cpp
+++ b/libtorrent/bindings/python/src/session.cpp
@@ -5,7 +5,6 @@
 #include <libtorrent/session.hpp>
 #include <libtorrent/torrent.hpp>
 #include <libtorrent/storage.hpp>
-#include <libtorrent/time.hpp>
 #include <boost/python.hpp>
 #include "gil.hpp"
 
@@ -57,7 +56,6 @@ extern char const* session_stop_lsd_doc;
 extern char const* session_stop_upnp_doc;
 extern char const* session_start_natpmp_doc;
 extern char const* session_stop_natpmp_doc;
-extern char const* session_wait_for_alert_doc;
 
 namespace
 {
@@ -250,7 +248,6 @@ void bind_session()
         .def("stop_lsd", allow_threads(&session::stop_lsd), session_stop_lsd_doc)
         .def("start_natpmp", allow_threads(&session::start_natpmp), session_start_natpmp_doc)
         .def("stop_natpmp", allow_threads(&session::stop_natpmp), session_stop_natpmp_doc)
-        .def("wait_for_alert", allow_threads(&session::wait_for_alert), session_wait_for_alert_doc)
         ;
 
     register_ptr_to_python<std::auto_ptr<alert> >();
diff --git a/libtorrent/include/libtorrent/alert.hpp b/libtorrent/include/libtorrent/alert.hpp
index 896443aaa..ab8065f1f 100755
--- a/libtorrent/include/libtorrent/alert.hpp
+++ b/libtorrent/include/libtorrent/alert.hpp
@@ -100,7 +100,7 @@ namespace libtorrent {
 		void set_severity(alert::severity_t severity);
 		bool should_post(alert::severity_t severity) const;
 
-		std::auto_ptr<alert> wait_for_alert(time_duration max_wait);
+		alert const* wait_for_alert(time_duration max_wait);
 
 	private:
 		std::queue<alert*> m_alerts;
diff --git a/libtorrent/include/libtorrent/aux_/session_impl.hpp b/libtorrent/include/libtorrent/aux_/session_impl.hpp
index 803d78e00..cf627c70b 100644
--- a/libtorrent/include/libtorrent/aux_/session_impl.hpp
+++ b/libtorrent/include/libtorrent/aux_/session_impl.hpp
@@ -280,7 +280,7 @@ namespace libtorrent
 			void set_severity_level(alert::severity_t s);
 			std::auto_ptr<alert> pop_alert();
 
-			std::auto_ptr<alert> wait_for_alert(time_duration max_wait);
+			alert const* wait_for_alert(time_duration max_wait);
 
 			int upload_rate_limit() const;
 			int download_rate_limit() const;
diff --git a/libtorrent/include/libtorrent/bandwidth_manager.hpp b/libtorrent/include/libtorrent/bandwidth_manager.hpp
index ef132543f..da251cf4b 100644
--- a/libtorrent/include/libtorrent/bandwidth_manager.hpp
+++ b/libtorrent/include/libtorrent/bandwidth_manager.hpp
@@ -111,7 +111,7 @@ struct bandwidth_limit
 
 	void assign(int amount) throw()
 	{
-		TORRENT_ASSERT(amount > 0);
+		TORRENT_ASSERT(amount >= 0);
 		m_current_rate += amount;
 		m_quota_left += amount;
 	}
@@ -225,8 +225,14 @@ struct bandwidth_manager
 		}
 #endif
 
-		TORRENT_ASSERT(peer->max_assignable_bandwidth(m_channel) > 0);
 		boost::shared_ptr<Torrent> t = peer->associated_torrent().lock();
+
+		if (peer->max_assignable_bandwidth(m_channel) == 0)
+		{
+			t->expire_bandwidth(m_channel, blk);
+			peer->assign_bandwidth(m_channel, 0);
+			return;
+		}
 		m_queue.push_back(bw_queue_entry<PeerConnection>(peer, blk, non_prioritized));
 		if (!non_prioritized)
 		{
@@ -389,6 +395,7 @@ private:
 			if (max_assignable == 0)
 			{
 				t->expire_bandwidth(m_channel, qe.max_block_size);
+				qe.peer->assign_bandwidth(m_channel, 0);
 				TORRENT_ASSERT(amount == limit - m_current_quota);
 				continue;
 			}
@@ -430,7 +437,7 @@ private:
 			if (block_size > qe.max_block_size) block_size = qe.max_block_size;
 
 #ifdef TORRENT_VERBOSE_BANDWIDTH_LIMIT
-		std::cerr << " block_size = " << block_size << " amount = " << amount << std::endl;
+			std::cerr << " block_size = " << block_size << " amount = " << amount << std::endl;
 #endif
 			if (amount < block_size / 2)
 			{
diff --git a/libtorrent/include/libtorrent/disk_io_thread.hpp b/libtorrent/include/libtorrent/disk_io_thread.hpp
index b93ea8b75..a77522356 100644
--- a/libtorrent/include/libtorrent/disk_io_thread.hpp
+++ b/libtorrent/include/libtorrent/disk_io_thread.hpp
@@ -124,7 +124,8 @@ namespace libtorrent
 
 	private:
 
-		mutable boost::mutex m_mutex;
+		typedef boost::recursive_mutex mutex_t;
+		mutable mutex_t m_mutex;
 		boost::condition m_signal;
 		bool m_abort;
 		std::deque<disk_io_job> m_jobs;
diff --git a/libtorrent/include/libtorrent/kademlia/dht_tracker.hpp b/libtorrent/include/libtorrent/kademlia/dht_tracker.hpp
index f61364707..c032c19d1 100644
--- a/libtorrent/include/libtorrent/kademlia/dht_tracker.hpp
+++ b/libtorrent/include/libtorrent/kademlia/dht_tracker.hpp
@@ -127,7 +127,20 @@ namespace libtorrent { namespace dht
 
 		// used to resolve hostnames for nodes
 		udp::resolver m_host_resolver;
-		
+
+		// used to ignore abusive dht nodes
+		struct node_ban_entry
+		{
+			node_ban_entry(): count(0) {}
+			udp::endpoint src;
+			ptime limit;
+			int count;
+		};
+
+		enum { num_ban_nodes = 20 };
+
+		node_ban_entry m_ban_nodes[num_ban_nodes];
+
 		// reference counter for intrusive_ptr
 		mutable boost::detail::atomic_count m_refs;
 
diff --git a/libtorrent/include/libtorrent/session.hpp b/libtorrent/include/libtorrent/session.hpp
index b9a726fb8..d2ab6ab2e 100755
--- a/libtorrent/include/libtorrent/session.hpp
+++ b/libtorrent/include/libtorrent/session.hpp
@@ -265,7 +265,7 @@ namespace libtorrent
 		std::auto_ptr<alert> pop_alert();
 		void set_severity_level(alert::severity_t s);
 
-		std::auto_ptr<alert> wait_for_alert(time_duration max_wait);
+		alert const* wait_for_alert(time_duration max_wait);
 
 		connection_queue& get_connection_queue();
 
diff --git a/libtorrent/include/libtorrent/session_settings.hpp b/libtorrent/include/libtorrent/session_settings.hpp
index df393692a..7cc7d26da 100644
--- a/libtorrent/include/libtorrent/session_settings.hpp
+++ b/libtorrent/include/libtorrent/session_settings.hpp
@@ -84,7 +84,7 @@ namespace libtorrent
 			LIBTORRENT_VERSION)
 			: user_agent(user_agent_)
 			, tracker_completion_timeout(60)
-			, tracker_receive_timeout(20)
+			, tracker_receive_timeout(40)
 			, stop_tracker_timeout(5)
 			, tracker_maximum_response_length(1024*1024)
 			, piece_timeout(10)
diff --git a/libtorrent/include/libtorrent/time.hpp b/libtorrent/include/libtorrent/time.hpp
index 4ab7a3819..ec1c0bce9 100644
--- a/libtorrent/include/libtorrent/time.hpp
+++ b/libtorrent/include/libtorrent/time.hpp
@@ -99,6 +99,7 @@ namespace libtorrent
 		time_duration operator/(int rhs) const { return time_duration(diff / rhs); }
 		explicit time_duration(boost::int64_t d) : diff(d) {}
 		time_duration& operator-=(time_duration const& c) { diff -= c.diff; return *this; }
+		time_duration operator+(time_duration const& c) { return time_duration(diff + c.diff); }
 		boost::int64_t diff;
 	};
 
diff --git a/libtorrent/src/alert.cpp b/libtorrent/src/alert.cpp
index 5b0f892f8..cb89147da 100755
--- a/libtorrent/src/alert.cpp
+++ b/libtorrent/src/alert.cpp
@@ -78,11 +78,11 @@ namespace libtorrent {
 		}
 	}
 
-	std::auto_ptr<alert> alert_manager::wait_for_alert(time_duration max_wait)
+	alert const* alert_manager::wait_for_alert(time_duration max_wait)
 	{
 		boost::mutex::scoped_lock lock(m_mutex);
 
-		if (!m_alerts.empty()) return std::auto_ptr<alert>(m_alerts.front());
+		if (!m_alerts.empty()) return m_alerts.front();
 		
 		int secs = total_seconds(max_wait);
 		max_wait -= seconds(secs);
@@ -96,10 +96,10 @@ namespace libtorrent {
 			xt.sec += 1;
 		}
 		xt.nsec = nsec;
-		if (!m_condition.timed_wait(lock, xt)) return std::auto_ptr<alert>(NULL);
+		if (!m_condition.timed_wait(lock, xt)) return 0;
 		TORRENT_ASSERT(!m_alerts.empty());
-		if (m_alerts.empty()) return std::auto_ptr<alert>(NULL);
-		return std::auto_ptr<alert>(m_alerts.front());
+		if (m_alerts.empty()) return 0;
+		return m_alerts.front();
 	}
 
 	void alert_manager::post_alert(const alert& alert_)
diff --git a/libtorrent/src/disk_io_thread.cpp b/libtorrent/src/disk_io_thread.cpp
index a9446f664..e0fa982bc 100644
--- a/libtorrent/src/disk_io_thread.cpp
+++ b/libtorrent/src/disk_io_thread.cpp
@@ -62,7 +62,7 @@ namespace libtorrent
 
 	disk_io_thread::~disk_io_thread()
 	{
-		boost::mutex::scoped_lock l(m_mutex);
+		mutex_t::scoped_lock l(m_mutex);
 		m_abort = true;
 		m_signal.notify_all();
 		l.unlock();
@@ -74,7 +74,7 @@ namespace libtorrent
 	disk_io_job disk_io_thread::find_job(boost::intrusive_ptr<piece_manager> s
 		, int action, int piece) const
 	{
-		boost::mutex::scoped_lock l(m_mutex);
+		mutex_t::scoped_lock l(m_mutex);
 		for (std::deque<disk_io_job>::const_iterator i = m_jobs.begin();
 			i != m_jobs.end(); ++i)
 		{
@@ -98,7 +98,7 @@ namespace libtorrent
 	// aborts read operations
 	void disk_io_thread::stop(boost::intrusive_ptr<piece_manager> s)
 	{
-		boost::mutex::scoped_lock l(m_mutex);
+		mutex_t::scoped_lock l(m_mutex);
 		// read jobs are aborted, write and move jobs are syncronized
 		for (std::deque<disk_io_job>::iterator i = m_jobs.begin();
 			i != m_jobs.end();)
@@ -151,7 +151,7 @@ namespace libtorrent
 	{
 		TORRENT_ASSERT(!j.callback);
 		TORRENT_ASSERT(j.storage);
-		boost::mutex::scoped_lock l(m_mutex);
+		mutex_t::scoped_lock l(m_mutex);
 		
 		std::deque<disk_io_job>::reverse_iterator i = m_jobs.rbegin();
 		if (j.action == disk_io_job::read)
@@ -206,7 +206,7 @@ namespace libtorrent
 
 	char* disk_io_thread::allocate_buffer()
 	{
-		boost::mutex::scoped_lock l(m_mutex);
+		mutex_t::scoped_lock l(m_mutex);
 #ifdef TORRENT_STATS
 		++m_allocations;
 #endif
@@ -215,7 +215,7 @@ namespace libtorrent
 
 	void disk_io_thread::free_buffer(char* buf)
 	{
-		boost::mutex::scoped_lock l(m_mutex);
+		mutex_t::scoped_lock l(m_mutex);
 #ifdef TORRENT_STATS
 		--m_allocations;
 #endif
@@ -229,7 +229,7 @@ namespace libtorrent
 #ifdef TORRENT_DISK_STATS
 			m_log << log_time() << " idle" << std::endl;
 #endif
-			boost::mutex::scoped_lock l(m_mutex);
+			mutex_t::scoped_lock l(m_mutex);
 #ifndef NDEBUG
 			m_current.action = (disk_io_job::action_t)-1;
 			m_current.piece = -1;
@@ -250,7 +250,7 @@ namespace libtorrent
 
 			int ret = 0;
 
-			bool free_buffer = true;
+			bool free_current_buffer = true;
 			try
 			{
 				TORRENT_ASSERT(j.storage);
@@ -264,15 +264,10 @@ namespace libtorrent
 #ifdef TORRENT_DISK_STATS
 						m_log << log_time() << " read " << j.buffer_size << std::endl;
 #endif
-						free_buffer = false;
+						free_current_buffer = false;
 						if (j.buffer == 0)
 						{
-							l.lock();
-							j.buffer = (char*)m_pool.ordered_malloc();
-#ifdef TORRENT_STATS
-							++m_allocations;
-#endif
-							l.unlock();
+							j.buffer = allocate_buffer();
 							TORRENT_ASSERT(j.buffer_size <= m_block_size);
 							if (j.buffer == 0)
 							{
@@ -347,14 +342,7 @@ namespace libtorrent
 			m_current.callback.clear();
 #endif
 			
-			if (j.buffer && free_buffer)
-			{
-				l.lock();
-				m_pool.ordered_free(j.buffer);
-#ifdef TORRENT_STATS
-				--m_allocations;
-#endif
-			}
+			if (j.buffer && free_current_buffer) free_buffer(j.buffer);
 		}
 	}
 }
diff --git a/libtorrent/src/http_connection.cpp b/libtorrent/src/http_connection.cpp
index a0d8e3fa3..a73d0a9af 100644
--- a/libtorrent/src/http_connection.cpp
+++ b/libtorrent/src/http_connection.cpp
@@ -284,7 +284,17 @@ void http_connection::on_read(asio::error_code const& e
 	{
 		libtorrent::buffer::const_interval rcv_buf(&m_recvbuffer[0]
 			, &m_recvbuffer[0] + m_read_pos);
-		m_parser.incoming(rcv_buf);
+		try
+		{
+			m_parser.incoming(rcv_buf);
+		}
+		catch (std::exception& e)
+		{
+			m_timer.cancel();
+			m_handler(asio::error::fault, m_parser, 0, 0);
+			m_handler.clear();
+			return;
+		}
 		if (!m_bottled && m_parser.header_finished())
 		{
 			if (m_read_pos > m_parser.body_start())
diff --git a/libtorrent/src/http_tracker_connection.cpp b/libtorrent/src/http_tracker_connection.cpp
index 86d21e494..b9581e862 100755
--- a/libtorrent/src/http_tracker_connection.cpp
+++ b/libtorrent/src/http_tracker_connection.cpp
@@ -217,7 +217,11 @@ namespace libtorrent
 					char dummy;
 					std::string bytes;
 					size_type range_start, range_end;
-					range_str >> bytes >> range_start >> dummy >> range_end;
+					// apparently some web servers do not send the "bytes"
+					// in their content-range
+					if (value.find(' ') != std::string::npos)
+						range_str >> bytes;
+					range_str >> range_start >> dummy >> range_end;
 					if (!range_str || range_end < range_start)
 					{
 						throw std::runtime_error("invalid content-range in HTTP response: " + range_str.str());
diff --git a/libtorrent/src/kademlia/dht_tracker.cpp b/libtorrent/src/kademlia/dht_tracker.cpp
index 3f47eb070..1a074bc20 100644
--- a/libtorrent/src/kademlia/dht_tracker.cpp
+++ b/libtorrent/src/kademlia/dht_tracker.cpp
@@ -405,6 +405,54 @@ namespace libtorrent { namespace dht
 
 		if (error) return;
 
+		node_ban_entry* match = 0;
+		node_ban_entry* min = m_ban_nodes;
+		ptime now = time_now();
+		for (node_ban_entry* i = m_ban_nodes; i < m_ban_nodes + num_ban_nodes; ++i)
+		{
+			if (i->src == m_remote_endpoint[current_buffer])
+			{
+				match = i;
+				break;
+			}
+			if (i->count < min->count) min = i;
+		}
+
+		if (match)
+		{
+			++match->count;
+			if (match->count >= 20)
+			{
+				if (now < match->limit)
+				{
+#ifdef TORRENT_DHT_VERBOSE_LOGGING
+					if (match->count == 20)
+					{
+						TORRENT_LOG(dht_tracker) << time_now_string() << " BANNING PEER [ ip: "
+							<< m_remote_endpoint[current_buffer] << " | "
+							"time: " << total_seconds((now - match->limit) + seconds(5))
+							<< " | count: " << match->count << " ]";
+					}
+#endif
+					// we've received 20 messages in less than 5 seconds from
+					// this node. Ignore it until it's silent for 5 minutes
+					match->limit = now + minutes(5);
+					return;
+				}
+
+				// we got 50 messages from this peer, but it was in
+				// more than 5 seconds. Reset the counter and the timer
+				match->count = 0;
+				match->limit = now + seconds(5);
+			}
+		}
+		else
+		{
+			min->count = 1;
+			min->limit = now + seconds(5);
+			min->src = m_remote_endpoint[current_buffer];
+		}
+
 #ifdef TORRENT_DHT_VERBOSE_LOGGING
 		++m_total_message_input;
 		m_total_in_bytes += bytes_transferred;
diff --git a/libtorrent/src/kademlia/rpc_manager.cpp b/libtorrent/src/kademlia/rpc_manager.cpp
index 5ae448501..e4019bab8 100644
--- a/libtorrent/src/kademlia/rpc_manager.cpp
+++ b/libtorrent/src/kademlia/rpc_manager.cpp
@@ -213,11 +213,11 @@ bool rpc_manager::incoming(msg const& m)
 			return false;
 		}
 		
-		if (m.addr != o->target_addr)
+		if (m.addr.address() != o->target_addr.address())
 		{
 #ifdef TORRENT_DHT_VERBOSE_LOGGING
 			TORRENT_LOG(rpc) << "Reply with incorrect address and valid transaction id: " 
-				<< tid << " from " << m.addr;
+				<< tid << " from " << m.addr << " expected: " << o->target_addr;
 #endif
 			return false;
 		}
diff --git a/libtorrent/src/session.cpp b/libtorrent/src/session.cpp
index 8efad6b0d..331ffa377 100755
--- a/libtorrent/src/session.cpp
+++ b/libtorrent/src/session.cpp
@@ -422,7 +422,7 @@ namespace libtorrent
 		return m_impl->pop_alert();
 	}
 
-	std::auto_ptr<alert> session::wait_for_alert(time_duration max_wait)
+	alert const* session::wait_for_alert(time_duration max_wait)
 	{
 		return m_impl->wait_for_alert(max_wait);
 	}
diff --git a/libtorrent/src/session_impl.cpp b/libtorrent/src/session_impl.cpp
index fdaacfabc..c1969d523 100755
--- a/libtorrent/src/session_impl.cpp
+++ b/libtorrent/src/session_impl.cpp
@@ -1836,7 +1836,7 @@ namespace detail
 			t.abort();
 
 			if ((!t.is_paused() || t.should_request())
-				&& !t.torrent_file().trackers().empty())
+				&& !t.trackers().empty())
 			{
 				tracker_request req = t.generate_tracker_request();
 				TORRENT_ASSERT(req.event == tracker_request::stopped);
@@ -2272,7 +2272,7 @@ namespace detail
 		return std::auto_ptr<alert>(0);
 	}
 	
-	std::auto_ptr<alert> session_impl::wait_for_alert(time_duration max_wait)
+	alert const* session_impl::wait_for_alert(time_duration max_wait)
 	{
 		return m_alerts.wait_for_alert(max_wait);
 	}
diff --git a/libtorrent/src/torrent.cpp b/libtorrent/src/torrent.cpp
index d28c97d47..557289d60 100755
--- a/libtorrent/src/torrent.cpp
+++ b/libtorrent/src/torrent.cpp
@@ -735,8 +735,10 @@ namespace libtorrent
 			return make_tuple(m_torrent_file->total_size()
 				, m_torrent_file->total_size());
 
+		TORRENT_ASSERT(m_num_pieces >= m_picker->num_have_filtered());
 		size_type wanted_done = size_type(m_num_pieces - m_picker->num_have_filtered())
 			* piece_size;
+		TORRENT_ASSERT(wanted_done >= 0);
 		
 		size_type total_done
 			= size_type(m_num_pieces) * piece_size;
@@ -762,6 +764,7 @@ namespace libtorrent
 
 		TORRENT_ASSERT(total_done <= m_torrent_file->total_size());
 		TORRENT_ASSERT(wanted_done <= m_torrent_file->total_size());
+		TORRENT_ASSERT(total_done >= wanted_done);
 
 		const std::vector<piece_picker::downloading_piece>& dl_queue
 			= m_picker->get_download_queue();
@@ -2760,6 +2763,8 @@ namespace libtorrent
 #endif
 
 		disconnect_all();
+		if (!m_paused)
+			m_just_paused = true;
 		m_paused = true;
 		// tell the tracker that we stopped
 		m_event = tracker_request::stopped;
@@ -3033,6 +3038,7 @@ namespace libtorrent
 		st.num_incomplete = m_incomplete;
 		st.paused = m_paused;
 		boost::tie(st.total_done, st.total_wanted_done) = bytes_done();
+		TORRENT_ASSERT(st.total_done >= st.total_wanted_done);
 
 		// payload transfer
 		st.total_payload_download = m_stat.total_payload_download();