diff --git a/libknet/threads_tx.c b/libknet/threads_tx.c
index 7238fc81..83110b90 100644
--- a/libknet/threads_tx.c
+++ b/libknet/threads_tx.c
@@ -1,999 +1,999 @@
 /*
  * Copyright (C) 2012-2022 Red Hat, Inc.  All rights reserved.
  *
  * Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
  *          Federico Simoncelli <fsimon@kronosnet.org>
  *
  * This software licensed under LGPL-2.0+
  */
 
 #include "config.h"
 
 #include <string.h>
 #include <pthread.h>
 #include <unistd.h>
 #include <sys/uio.h>
 #include <errno.h>
 
 #include "compat.h"
 #include "compress.h"
 #include "crypto.h"
 #include "host.h"
 #include "link.h"
 #include "logging.h"
 #include "transports.h"
 #include "transport_common.h"
 #include "threads_common.h"
 #include "threads_heartbeat.h"
 #include "threads_tx.h"
 #include "netutils.h"
 #include "onwire_v1.h"
 
 /*
  * SEND
  */
 
 static int _dispatch_to_links(knet_handle_t knet_h, struct knet_host *dst_host, struct knet_mmsghdr *msg, int msgs_to_send)
 {
 	int link_idx, msg_idx, sent_msgs, prev_sent, progress;
 	int err = 0, savederrno = 0, locked = 0;
 	unsigned int i;
 	struct knet_mmsghdr *cur;
 	struct knet_link *cur_link;
 
 	for (link_idx = 0; link_idx < dst_host->active_link_entries; link_idx++) {
 		prev_sent = 0;
 		progress = 1;
 		locked = 0;
 
 		cur_link = &dst_host->link[dst_host->active_links[link_idx]];
 
 		if (cur_link->transport == KNET_TRANSPORT_LOOPBACK) {
 			continue;
 		}
 
 		savederrno = pthread_mutex_lock(&cur_link->link_stats_mutex);
 		if (savederrno) {
 			log_err(knet_h, KNET_SUB_TX, "Unable to get stats mutex lock for host %u link %u: %s",
 				dst_host->host_id, cur_link->link_id, strerror(savederrno));
 			continue;
 		}
 		locked = 1;
 
 		msg_idx = 0;
 		while (msg_idx < msgs_to_send) {
 			msg[msg_idx].msg_hdr.msg_name = &cur_link->dst_addr;
 			msg[msg_idx].msg_hdr.msg_namelen = knet_h->knet_transport_fd_tracker[cur_link->outsock].sockaddr_len;
 
 			/* Cast for Linux/BSD compatibility */
 			for (i=0; i<(unsigned int)msg[msg_idx].msg_hdr.msg_iovlen; i++) {
 				cur_link->status.stats.tx_data_bytes += msg[msg_idx].msg_hdr.msg_iov[i].iov_len;
 			}
 			cur_link->status.stats.tx_data_packets++;
 			msg_idx++;
 		}
 
 retry:
 		cur = &msg[prev_sent];
 
 		sent_msgs = _sendmmsg(dst_host->link[dst_host->active_links[link_idx]].outsock,
 				      transport_get_connection_oriented(knet_h, dst_host->link[dst_host->active_links[link_idx]].transport),
 				      &cur[0], msgs_to_send - prev_sent, MSG_DONTWAIT | MSG_NOSIGNAL);
 		savederrno = errno;
 
 		err = transport_tx_sock_error(knet_h, dst_host->link[dst_host->active_links[link_idx]].transport, dst_host->link[dst_host->active_links[link_idx]].outsock, sent_msgs, savederrno);
 		switch(err) {
 			case KNET_TRANSPORT_SOCK_ERROR_INTERNAL:
 				cur_link->status.stats.tx_data_errors++;
 				goto out_unlock;
 				break;
 			case KNET_TRANSPORT_SOCK_ERROR_IGNORE:
 				break;
 			case KNET_TRANSPORT_SOCK_ERROR_RETRY:
 				cur_link->status.stats.tx_data_retries++;
 				goto retry;
 				break;
 		}
 
 		prev_sent = prev_sent + sent_msgs;
 
 		if ((sent_msgs >= 0) && (prev_sent < msgs_to_send)) {
 			if ((sent_msgs) || (progress)) {
 				if (sent_msgs) {
 					progress = 1;
 				} else {
 					progress = 0;
 				}
 #ifdef DEBUG
 				log_debug(knet_h, KNET_SUB_TX, "Unable to send all (%d/%d) data packets to host %s (%u) link %s:%s (%u)",
 					  sent_msgs, msg_idx,
 					  dst_host->name, dst_host->host_id,
 					  dst_host->link[dst_host->active_links[link_idx]].status.dst_ipaddr,
 					  dst_host->link[dst_host->active_links[link_idx]].status.dst_port,
 					  dst_host->link[dst_host->active_links[link_idx]].link_id);
 #endif
 				goto retry;
 			}
 			if (!progress) {
 				savederrno = EAGAIN;
 				err = -1;
 				goto out_unlock;
 			}
 		}
 
 		if ((dst_host->link_handler_policy == KNET_LINK_POLICY_RR) &&
 		    (dst_host->active_link_entries > 1)) {
 			uint8_t cur_link_id = dst_host->active_links[0];
 
 			memmove(&dst_host->active_links[0], &dst_host->active_links[1], KNET_MAX_LINK - 1);
 			dst_host->active_links[dst_host->active_link_entries - 1] = cur_link_id;
 
 			break;
 		}
 		pthread_mutex_unlock(&cur_link->link_stats_mutex);
 		locked = 0;
 	}
 
 out_unlock:
 	if (locked) {
 		pthread_mutex_unlock(&cur_link->link_stats_mutex);
 	}
 	errno = savederrno;
 	return err;
 }
 
 static int _dispatch_to_local(knet_handle_t knet_h, unsigned char *data, size_t inlen, int8_t channel)
 {
 	int err = 0, savederrno = 0;
 	const unsigned char *buf = data;
 	ssize_t buflen = inlen;
 	struct knet_link *local_link = knet_h->host_index[knet_h->host_id]->link;
 
 local_retry:
 	err = write(knet_h->sockfd[channel].sockfd[knet_h->sockfd[channel].is_created], buf, buflen);
 	savederrno = errno;
 	if (err < 0) {
 		log_err(knet_h, KNET_SUB_TRANSP_LOOPBACK, "send local failed. error=%s\n", strerror(errno));
 		local_link->status.stats.tx_data_errors++;
 		goto out;
 	}
 	if (err > 0 && err < buflen) {
 		log_debug(knet_h, KNET_SUB_TRANSP_LOOPBACK, "send local incomplete=%d bytes of %zu\n", err, inlen);
 		local_link->status.stats.tx_data_retries++;
 		buf += err;
 		buflen -= err;
 		goto local_retry;
 	}
 	if (err == buflen) {
 		local_link->status.stats.tx_data_packets++;
 		local_link->status.stats.tx_data_bytes += inlen;
 	}
 out:
 	errno = savederrno;
 	return err;
 }
 
 static int _prep_tx_bufs(knet_handle_t knet_h,
 			  struct knet_header *inbuf, uint8_t onwire_ver,
 			  unsigned char *data, size_t inlen, uint32_t data_checksum,
 			  seq_num_t tx_seq_num, int8_t channel, int bcast, int data_compressed,
 			  int *msgs_to_send, struct iovec iov_out[PCKT_FRAG_MAX][2], int *iovcnt_out)
 {
 	int err = 0, savederrno = 0;
 	unsigned int temp_data_mtu;
 
 	if (!knet_h->data_mtu) {
 		/*
 		 * using MIN_MTU_V4 for data mtu is not completely accurate but safe enough
 		 */
 		log_debug(knet_h, KNET_SUB_TX,
 			  "Received data packet but data MTU is still unknown."
 			  " Packet might not be delivered."
 			  " Assuming minimum IPv4 MTU (%d)",
 			  KNET_PMTUD_MIN_MTU_V4);
 		temp_data_mtu = KNET_PMTUD_MIN_MTU_V4;
 	} else {
 		/*
 		 * take a copy of the mtu to avoid value changing under
 		 * our feet while we are sending a fragmented pckt
 		 */
 		temp_data_mtu = knet_h->data_mtu;
 	}
 
 	if (knet_h->onwire_ver_remap) {
 		prep_tx_bufs_v1(knet_h, inbuf, data, inlen, data_checksum, temp_data_mtu, tx_seq_num, channel, bcast, data_compressed, msgs_to_send, iov_out, iovcnt_out);
 	} else {
 		switch (onwire_ver) {
 			case 1:
 				prep_tx_bufs_v1(knet_h, inbuf, data, inlen, data_checksum, temp_data_mtu, tx_seq_num, channel, bcast, data_compressed, msgs_to_send, iov_out, iovcnt_out);
 				break;
 			default: /* this should never hit as filters are in place in the calling functions */
 				log_warn(knet_h, KNET_SUB_TX, "preparing data onwire version %u not supported", onwire_ver);
 				savederrno = EINVAL;
 				err = -1;
 				goto out;
 				break;
 		}
 	}
 
 out:
 	errno = savederrno;
 	return err;
 }
 
 static int _compress_data(knet_handle_t knet_h, unsigned char* data, size_t *inlen, int *data_compressed)
 {
 	int err = 0, savederrno = 0;
 	int stats_locked = 0, stats_err = 0;
 	size_t cmp_outlen = KNET_DATABUFSIZE_COMPRESS;
 	struct timespec start_time;
 	struct timespec end_time;
 	uint64_t compress_time;
 
 	/*
 	 * compress data
 	 */
 	if (knet_h->compress_model > 0) {
 		if (*inlen > knet_h->compress_threshold) {
 			clock_gettime(CLOCK_MONOTONIC, &start_time);
 			err = compress(knet_h,
 				       data, *inlen,
 				       knet_h->send_to_links_buf_compress, (ssize_t *)&cmp_outlen);
 
 			savederrno = errno;
 			clock_gettime(CLOCK_MONOTONIC, &end_time);
 			timespec_diff(start_time, end_time, &compress_time);
 
 			stats_err = pthread_mutex_lock(&knet_h->handle_stats_mutex);
 			if (stats_err < 0) {
 				log_err(knet_h, KNET_SUB_TX, "Unable to get mutex lock: %s", strerror(stats_err));
 				err = -1;
 				savederrno = stats_err;
 				goto out;
 			}
 			stats_locked = 1;
 			/* Collect stats */
 
 			if (compress_time < knet_h->stats.tx_compress_time_min) {
 				knet_h->stats.tx_compress_time_min = compress_time;
 			}
 			if (compress_time > knet_h->stats.tx_compress_time_max) {
 				knet_h->stats.tx_compress_time_max = compress_time;
 			}
 			knet_h->stats.tx_compress_time_ave =
 				(unsigned long long)(knet_h->stats.tx_compress_time_ave * knet_h->stats.tx_compressed_packets +
 				 compress_time) / (knet_h->stats.tx_compressed_packets+1);
 			if (err < 0) {
 				knet_h->stats.tx_failed_to_compress++;
 				log_warn(knet_h, KNET_SUB_COMPRESS, "Compression failed (%d): %s", err, strerror(savederrno));
 			} else {
 				knet_h->stats.tx_compressed_packets++;
 				knet_h->stats.tx_compressed_original_bytes += *inlen;
 				knet_h->stats.tx_compressed_size_bytes += cmp_outlen;
 
 				if (cmp_outlen < *inlen) {
 					memmove(data, knet_h->send_to_links_buf_compress, cmp_outlen);
 					*inlen = cmp_outlen;
 					*data_compressed = 1;
 				} else {
 					knet_h->stats.tx_unable_to_compress++;
 				}
 			}
 		}
 		if (!*data_compressed) {
 			if (!stats_locked) {
 				stats_err = pthread_mutex_lock(&knet_h->handle_stats_mutex);
 				if (stats_err < 0) {
 					log_err(knet_h, KNET_SUB_TX, "Unable to get mutex lock: %s", strerror(stats_err));
 					err = -1;
 					savederrno = stats_err;
 					goto out;
 				}
 				stats_locked = 1;
 			}
 			knet_h->stats.tx_uncompressed_packets++;
 		}
 		if (stats_locked) {
 			pthread_mutex_unlock(&knet_h->handle_stats_mutex);
 		}
 	}
 
 out:
 	errno = savederrno;
 	return err;
 }
 
 static int _encrypt_bufs(knet_handle_t knet_h, int msgs_to_send, struct iovec iov_out[PCKT_FRAG_MAX][2], int *iovcnt_out)
 {
 	int err = 0, savederrno = 0, stats_err = 0;
 	struct timespec start_time;
 	struct timespec end_time;
 	uint64_t crypt_time;
 	uint8_t frag_idx = 0;
 	size_t outlen, uncrypted_frag_size;
 	int j;
 
 	if (knet_h->crypto_in_use_config) {
 		while (frag_idx < msgs_to_send) {
 			clock_gettime(CLOCK_MONOTONIC, &start_time);
 			if (crypto_encrypt_and_signv(
 					knet_h,
 					iov_out[frag_idx], *iovcnt_out,
 					knet_h->send_to_links_buf_crypt[frag_idx],
 					(ssize_t *)&outlen) < 0) {
 				log_debug(knet_h, KNET_SUB_TX, "Unable to encrypt packet");
 				savederrno = ECHILD;
 				err = -1;
 				goto out;
 			}
 			clock_gettime(CLOCK_MONOTONIC, &end_time);
 			timespec_diff(start_time, end_time, &crypt_time);
 
 			stats_err = pthread_mutex_lock(&knet_h->handle_stats_mutex);
 			if (stats_err < 0) {
 				log_err(knet_h, KNET_SUB_TX, "Unable to get mutex lock: %s", strerror(stats_err));
 				err = -1;
 				savederrno = stats_err;
 				goto out;
 			}
 
 			if (crypt_time < knet_h->stats.tx_crypt_time_min) {
 				knet_h->stats.tx_crypt_time_min = crypt_time;
 			}
 			if (crypt_time > knet_h->stats.tx_crypt_time_max) {
 				knet_h->stats.tx_crypt_time_max = crypt_time;
 			}
 			knet_h->stats.tx_crypt_time_ave =
 				(knet_h->stats.tx_crypt_time_ave * knet_h->stats.tx_crypt_packets +
 				 crypt_time) / (knet_h->stats.tx_crypt_packets+1);
 
 			uncrypted_frag_size = 0;
 			for (j=0; j < *iovcnt_out; j++) {
 				uncrypted_frag_size += iov_out[frag_idx][j].iov_len;
 			}
 			knet_h->stats.tx_crypt_byte_overhead += (outlen - uncrypted_frag_size);
 			knet_h->stats.tx_crypt_packets++;
 			pthread_mutex_unlock(&knet_h->handle_stats_mutex);
 
 			iov_out[frag_idx][0].iov_base = knet_h->send_to_links_buf_crypt[frag_idx];
 			iov_out[frag_idx][0].iov_len = outlen;
 			frag_idx++;
 		}
 		*iovcnt_out = 1;
 	}
 out:
 	errno = savederrno;
 	return err;
 }
 
 static int _get_tx_seq_num(knet_handle_t knet_h, seq_num_t *tx_seq_num)
 {
 	int savederrno = 0;
 
 	savederrno = pthread_mutex_lock(&knet_h->tx_seq_num_mutex);
 	if (savederrno) {
 		log_debug(knet_h, KNET_SUB_TX, "Unable to get seq mutex lock");
 		errno = savederrno;
 		return -1;
 	}
 
 	knet_h->tx_seq_num++;
 	/*
 	 * force seq_num 0 to detect a node that has crashed and rejoining
 	 * the knet instance. seq_num 0 will clear the buffers in the RX
 	 * thread
 	 */
 	if (knet_h->tx_seq_num == 0) {
 		knet_h->tx_seq_num++;
 	}
 	/*
 	 * cache the value in locked context
 	 */
 	*tx_seq_num = knet_h->tx_seq_num;
 	pthread_mutex_unlock(&knet_h->tx_seq_num_mutex);
 
 	/*
 	 * forcefully broadcast a ping to all nodes every SEQ_MAX / 8
 	 * pckts.
 	 * this solves 2 problems:
 	 * 1) on TX socket overloads we generate extra pings to keep links alive
 	 * 2) in 3+ nodes setup, where all the traffic is flowing between node 1 and 2,
 	 *    node 3+ will be able to keep in sync on the TX seq_num even without
 	 *    receiving traffic or pings in betweens. This avoids issues with
 	 *    rollover of the circular buffer
 	 */
 
 	if (*tx_seq_num % (SEQ_MAX / 8) == 0) {
 		_send_pings(knet_h, 0);
 	}
 	return 0;
 }
 
 
 static int _get_data_dests(knet_handle_t knet_h, unsigned char* data, size_t inlen,
 			   int8_t *channel, int *bcast, int *send_local,
 			   knet_node_id_t *dst_host_ids, size_t *dst_host_ids_entries,
 			   int is_sync)
 {
 	int err = 0, savederrno = 0;
 	knet_node_id_t dst_host_ids_temp[KNET_MAX_HOST];	/* store destinations from filter */
 	size_t dst_host_ids_entries_temp = 0;
 	size_t dst_host_ids_entries_temp2 = 0;			/* workaround gcc here */
 	struct knet_host *dst_host;
 	size_t host_idx;
 
 	memset(dst_host_ids_temp, 0, sizeof(dst_host_ids_temp));
 
 	if (knet_h->dst_host_filter_fn) {
 		*bcast = knet_h->dst_host_filter_fn(
 				knet_h->dst_host_filter_fn_private_data,
 				data,
 				inlen,
 				KNET_NOTIFY_TX,
 				knet_h->host_id,
 				knet_h->host_id,
 				channel,
 				dst_host_ids_temp,
 				&dst_host_ids_entries_temp);
 		if (*bcast < 0) {
 			log_debug(knet_h, KNET_SUB_TX, "Error from dst_host_filter_fn: %d", *bcast);
 			savederrno = EFAULT;
 			err = -1;
 			goto out;
 		}
 
 		if ((!*bcast) && (!dst_host_ids_entries_temp)) {
 			log_debug(knet_h, KNET_SUB_TX, "Message is unicast but no dst_host_ids_entries");
 			savederrno = EINVAL;
 			err = -1;
 			goto out;
 		}
 
 		if ((!*bcast) &&
 		    (dst_host_ids_entries_temp > KNET_MAX_HOST)) {
 			log_debug(knet_h, KNET_SUB_TX, "dst_host_filter_fn returned too many destinations");
 			savederrno = EINVAL;
 			err = -1;
 			goto out;
 		}
 
 		if (is_sync) {
 			if ((*bcast) ||
 			    ((!*bcast) && (dst_host_ids_entries_temp > 1))) {
 				log_debug(knet_h, KNET_SUB_TX, "knet_send_sync is only supported with unicast packets for one destination");
 				savederrno = E2BIG;
 				err = -1;
 				goto out;
 			}
 		}
 	}
 
 	/*
 	 * check destinations hosts before spending time
 	 * in fragmenting/encrypting packets to save
 	 * time processing data for unreachable hosts.
 	 * for unicast, also remap the destination data
 	 * to skip unreachable hosts.
 	 */
 
 	if (!*bcast) {
 		*dst_host_ids_entries = dst_host_ids_entries_temp2;
 		for (host_idx = 0; host_idx < dst_host_ids_entries_temp; host_idx++) {
 			dst_host = knet_h->host_index[dst_host_ids_temp[host_idx]];
 			if (!dst_host) {
 				continue;
 			}
 			if ((dst_host->host_id == knet_h->host_id) &&
 			    (knet_h->has_loop_link)) {
 				*send_local = 1;
 			}
 			if (!((dst_host->host_id == knet_h->host_id) &&
 			     (knet_h->has_loop_link)) &&
 			    dst_host->status.reachable) {
 				dst_host_ids[dst_host_ids_entries_temp2] = dst_host_ids_temp[host_idx];
 				dst_host_ids_entries_temp2++;
 			}
 		}
 		if ((!dst_host_ids_entries_temp2) && (!*send_local)) {
 			savederrno = EHOSTDOWN;
 			err = -1;
 			goto out;
 		}
 		*dst_host_ids_entries = dst_host_ids_entries_temp2;
 	} else {
 		*bcast = 0;
 		*send_local = 0;
 		for (dst_host = knet_h->host_head; dst_host != NULL; dst_host = dst_host->next) {
 			if ((dst_host->host_id == knet_h->host_id) &&
 			    (knet_h->has_loop_link)) {
 				*send_local = 1;
 			}
 			if (!(dst_host->host_id == knet_h->host_id &&
 			      knet_h->has_loop_link) &&
 			    dst_host->status.reachable) {
 				*bcast = 1;
 			}
 		}
 		if ((!*bcast) && (!*send_local)) {
 			savederrno = EHOSTDOWN;
 			err = -1;
 			goto out;
 		}
 	}
 
 out:
 	errno = savederrno;
 	return err;
 }
 
 static int _prep_and_send_msgs(knet_handle_t knet_h, int bcast, knet_node_id_t *dst_host_ids, size_t dst_host_ids_entries, int msgs_to_send, struct iovec iov_out[PCKT_FRAG_MAX][2], int iovcnt_out)
 {
 	int err = 0, savederrno = 0;
 	struct knet_host *dst_host;
 	struct knet_mmsghdr msg[PCKT_FRAG_MAX];
 	int msg_idx;
 	size_t host_idx;
 
 	memset(&msg, 0, sizeof(msg));
 
 	msg_idx = 0;
 
 	while (msg_idx < msgs_to_send) {
 		msg[msg_idx].msg_hdr.msg_namelen = sizeof(struct sockaddr_storage); /* this will set properly in _dispatch_to_links() */
 		msg[msg_idx].msg_hdr.msg_iov = &iov_out[msg_idx][0];
 		msg[msg_idx].msg_hdr.msg_iovlen = iovcnt_out;
 		msg_idx++;
 	}
 
 	if (!bcast) {
 		for (host_idx = 0; host_idx < dst_host_ids_entries; host_idx++) {
 			dst_host = knet_h->host_index[dst_host_ids[host_idx]];
 
 			err = _dispatch_to_links(knet_h, dst_host, &msg[0], msgs_to_send);
 			savederrno = errno;
 			if (err) {
 				goto out;
 			}
 		}
 	} else {
 		for (dst_host = knet_h->host_head; dst_host != NULL; dst_host = dst_host->next) {
 			if (dst_host->status.reachable) {
 				err = _dispatch_to_links(knet_h, dst_host, &msg[0], msgs_to_send);
 				savederrno = errno;
 				if (err) {
 					goto out;
 				}
 			}
 		}
 	}
 
 out:
 	errno = savederrno;
 	return err;
 }
 
 static int _parse_recv_from_sock(knet_handle_t knet_h, size_t inlen, int8_t channel, uint8_t onwire_ver, int is_sync)
 {
 	int err = 0, savederrno = 0;
 	struct knet_header *inbuf = knet_h->recv_from_sock_buf; /* all TX packets are stored here regardless of the onwire */
 	unsigned char *data;					/* onwire neutrual pointer to data to send */
 	int data_compressed = 0;				/* track data compression to fill the header */
 	seq_num_t tx_seq_num;
 	uint32_t data_checksum = 0;				/* used only for debugging at the moment */
 
 	int bcast = 1;						/* assume all packets are to be broadcasted unless filter tells us differently */
 	knet_node_id_t dst_host_ids[KNET_MAX_HOST];		/* store destinations from filter */
 	size_t dst_host_ids_entries = 0;
 	int send_local = 0;					/* send packets to loopback */
 
 	struct iovec iov_out[PCKT_FRAG_MAX][2];
 	int iovcnt_out = 2;
 	int msgs_to_send = 0;
 
 	if (knet_h->enabled != 1) {
 		log_debug(knet_h, KNET_SUB_TX, "Received data packet but forwarding is disabled");
 		savederrno = ECANCELED;
 		err = -1;
 		goto out;
 	}
 
 	if (knet_h->onwire_ver_remap) {
 		data = get_data_v1(knet_h, inbuf);
 	} else {
 		switch (onwire_ver) {
 			case 1:
 				data = get_data_v1(knet_h, inbuf);
 				break;
 			default: /* this should never hit as filters are in place in the calling functions */
 				log_warn(knet_h, KNET_SUB_TX, "preparing data onwire version %u not supported", onwire_ver);
 				savederrno = EINVAL;
 				err = -1;
 				goto out;
 				break;
 		}
 	}
 
 #ifdef ONWIRE_V1_EXTRA_DEBUG
 	data_checksum = compute_chksum(data, inlen);
 #endif
 
 	memset(dst_host_ids, 0, sizeof(dst_host_ids));
 	err = _get_data_dests(knet_h, data, inlen,
 			      &channel, &bcast, &send_local,
 			      dst_host_ids, &dst_host_ids_entries,
 			      is_sync);
 	if (err < 0) {
 		savederrno = errno;
 		goto out;
 	}
 
 	/* Send to localhost if appropriate and enabled */
 	if (send_local) {
 		err = _dispatch_to_local(knet_h, data, inlen, channel);
 		if (err < 0) {
 			savederrno = errno;
 			goto out;
 		}
 	}
 
 	err = _compress_data(knet_h, data, &inlen, &data_compressed);
 	if (err < 0) {
 		savederrno = errno;
 		goto out;
 	}
 
 	err = _get_tx_seq_num(knet_h, &tx_seq_num);
 	if (err < 0) {
 		savederrno = errno;
 		goto out;
 	}
 
 	err = _prep_tx_bufs(knet_h, inbuf, onwire_ver, data, inlen, data_checksum, tx_seq_num, channel, bcast, data_compressed, &msgs_to_send, iov_out, &iovcnt_out);
 	if (err < 0) {
 		savederrno = errno;
 		goto out;
 	}
 
 	err = _encrypt_bufs(knet_h, msgs_to_send, iov_out, &iovcnt_out);
 	if (err < 0) {
 		savederrno = errno;
 		goto out;
 	}
 
 	err = _prep_and_send_msgs(knet_h, bcast, dst_host_ids, dst_host_ids_entries, msgs_to_send, iov_out, iovcnt_out);
 	if (err < 0) {
 		savederrno = errno;
 		goto out;
 	}
 
 out:
 	errno = savederrno;
 	return err;
 }
 
 static void _handle_send_to_links(knet_handle_t knet_h, int sockfd, uint8_t onwire_ver, int8_t channel)
 {
 	ssize_t inlen = 0;
 	int savederrno = 0, docallback = 0;
 	struct iovec iov_in;
 	struct msghdr msg;
 	struct sockaddr_storage address;
 
 	memset(&iov_in, 0, sizeof(iov_in));
 
 	if (knet_h->onwire_ver_remap) {
 		iov_in.iov_base = (void *)get_data_v1(knet_h, knet_h->recv_from_sock_buf);
 		iov_in.iov_len = KNET_MAX_PACKET_SIZE;
 	} else {
 		switch (onwire_ver) {
 			case 1:
 				iov_in.iov_base = (void *)get_data_v1(knet_h, knet_h->recv_from_sock_buf);
 				iov_in.iov_len = KNET_MAX_PACKET_SIZE;
 				break;
 			default:
 				log_warn(knet_h, KNET_SUB_TX, "preparing data onwire version %u not supported", onwire_ver);
 				break;
 		}
 	}
 
 	memset(&msg, 0, sizeof(struct msghdr));
 	msg.msg_name = &address;
 	msg.msg_namelen = knet_h->knet_transport_fd_tracker[sockfd].sockaddr_len;
 	msg.msg_iov = &iov_in;
 	msg.msg_iovlen = 1;
 
 	if ((channel >= 0) &&
 	    (channel < KNET_DATAFD_MAX) &&
 	    (!knet_h->sockfd[channel].is_socket)) {
 		inlen = readv(sockfd, msg.msg_iov, 1);
 	} else {
 		inlen = recvmsg(sockfd, &msg, MSG_DONTWAIT | MSG_NOSIGNAL);
 		if (msg.msg_flags & MSG_TRUNC) {
 			log_warn(knet_h, KNET_SUB_TX, "Received truncated message from sock %d. Discarding", sockfd);
 			return;
 		}
 	}
 
 	if (inlen == 0) {
 		savederrno = 0;
 		docallback = 1;
 	} else if (inlen < 0) {
 		struct epoll_event ev;
 
 		savederrno = errno;
 		docallback = 1;
 		memset(&ev, 0, sizeof(struct epoll_event));
 
 		if (epoll_ctl(knet_h->send_to_links_epollfd,
 			      EPOLL_CTL_DEL, knet_h->sockfd[channel].sockfd[knet_h->sockfd[channel].is_created], &ev)) {
 			log_err(knet_h, KNET_SUB_TX, "Unable to del datafd %d from linkfd epoll pool: %s",
 				knet_h->sockfd[channel].sockfd[0], strerror(savederrno));
 		} else {
 			knet_h->sockfd[channel].has_error = 1;
 		}
 	} else {
 		_parse_recv_from_sock(knet_h, inlen, channel, onwire_ver, 0);
 	}
 
 	if (docallback) {
 		knet_h->sock_notify_fn(knet_h->sock_notify_fn_private_data,
 				       knet_h->sockfd[channel].sockfd[0],
 				       channel,
 				       KNET_NOTIFY_TX,
 				       inlen,
 				       savederrno);
 	}
 }
 
 void *_handle_send_to_links_thread(void *data)
 {
 	knet_handle_t knet_h = (knet_handle_t) data;
-	struct epoll_event events[KNET_EPOLL_MAX_EVENTS];
+	struct epoll_event events[KNET_EPOLL_MAX_EVENTS + 1]; /* see _init_epolls for + 1 */
 	int i, nev;
 	int flush, flush_queue_limit;
 	int8_t channel;
 	uint8_t onwire_ver;
 
 	set_thread_status(knet_h, KNET_THREAD_TX, KNET_THREAD_STARTED);
 
 	memset(&events, 0, sizeof(events));
 
 	flush_queue_limit = 0;
 
 	while (!shutdown_in_progress(knet_h)) {
 		nev = epoll_wait(knet_h->send_to_links_epollfd, events, KNET_EPOLL_MAX_EVENTS + 1, knet_h->threads_timer_res / 1000);
 
 		flush = get_thread_flush_queue(knet_h, KNET_THREAD_TX);
 
 		/*
 		 * we use timeout to detect if thread is shutting down
 		 */
 		if (nev == 0) {
 			/*
 			 * ideally we want to communicate that we are done flushing
 			 * the queue when we have an epoll timeout event
 			 */
 			if (flush == KNET_THREAD_QUEUE_FLUSH) {
 				set_thread_flush_queue(knet_h, KNET_THREAD_TX, KNET_THREAD_QUEUE_FLUSHED);
 				flush_queue_limit = 0;
 			}
 			continue;
 		}
 
 		/*
 		 * fall back in case the TX sockets will continue receive traffic
 		 * and we do not hit an epoll timeout.
 		 *
 		 * allow up to a 100 loops to flush queues, then we give up.
 		 * there might be more clean ways to do it by checking the buffer queue
 		 * on each socket, but we have tons of sockets and calculations can go wrong.
 		 * Also, why would you disable data forwarding and still send packets?
 		 */
 		if (flush == KNET_THREAD_QUEUE_FLUSH) {
 			if (flush_queue_limit >= 100) {
 				log_debug(knet_h, KNET_SUB_TX, "Timeout flushing the TX queue, expect packet loss");
 				set_thread_flush_queue(knet_h, KNET_THREAD_TX, KNET_THREAD_QUEUE_FLUSHED);
 				flush_queue_limit = 0;
 			} else {
 				flush_queue_limit++;
 			}
 		} else {
 			flush_queue_limit = 0;
 		}
 
 		if (pthread_rwlock_rdlock(&knet_h->global_rwlock) != 0) {
 			log_debug(knet_h, KNET_SUB_TX, "Unable to get read lock");
 			continue;
 		}
 
 		if (pthread_mutex_lock(&knet_h->onwire_mutex)) {
 			log_debug(knet_h, KNET_SUB_TX, "Unable to get onwire mutex lock");
 			goto out_unlock;
 		}
 		onwire_ver = knet_h->onwire_ver;
 		pthread_mutex_unlock(&knet_h->onwire_mutex);
 
 		for (i = 0; i < nev; i++) {
 			for (channel = 0; channel < KNET_DATAFD_MAX; channel++) {
 				if ((knet_h->sockfd[channel].in_use) &&
 				    (knet_h->sockfd[channel].sockfd[knet_h->sockfd[channel].is_created] == events[i].data.fd)) {
 					break;
 				}
 			}
 			if (channel >= KNET_DATAFD_MAX) {
 				log_debug(knet_h, KNET_SUB_TX, "No available channels");
 				continue; /* channel not found */
 			}
 			if (pthread_mutex_lock(&knet_h->tx_mutex) != 0) {
 				log_debug(knet_h, KNET_SUB_TX, "Unable to get mutex lock");
 				continue;
 			}
 			_handle_send_to_links(knet_h, events[i].data.fd, onwire_ver, channel);
 			pthread_mutex_unlock(&knet_h->tx_mutex);
 		}
 out_unlock:
 		pthread_rwlock_unlock(&knet_h->global_rwlock);
 	}
 
 	set_thread_status(knet_h, KNET_THREAD_TX, KNET_THREAD_STOPPED);
 
 	return NULL;
 }
 
 int knet_send_sync(knet_handle_t knet_h, const char *buff, const size_t buff_len, const int8_t channel)
 {
 	int savederrno = 0, err = 0;
 	uint8_t onwire_ver;
 
 	if (!_is_valid_handle(knet_h)) {
 		return -1;
 	}
 
 	if (buff == NULL) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	if (buff_len <= 0) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	if (buff_len > KNET_MAX_PACKET_SIZE) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	if (channel < 0) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	if (channel >= KNET_DATAFD_MAX) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	savederrno = pthread_rwlock_rdlock(&knet_h->global_rwlock);
 	if (savederrno) {
 		log_err(knet_h, KNET_SUB_TX, "Unable to get read lock: %s",
 			strerror(savederrno));
 		errno = savederrno;
 		return -1;
 	}
 
 	if (!knet_h->dst_host_filter_fn) {
 		savederrno = ENETDOWN;
 		err = -1;
 		goto out;
 	}
 
 	if (!knet_h->sockfd[channel].in_use) {
 		savederrno = EINVAL;
 		err = -1;
 		goto out;
 	}
 
 	if (pthread_mutex_lock(&knet_h->onwire_mutex)) {
 		log_debug(knet_h, KNET_SUB_TX, "Unable to get onwire mutex lock");
 		goto out;
 	}
 	onwire_ver = knet_h->onwire_ver;
 	pthread_mutex_unlock(&knet_h->onwire_mutex);
 
 	savederrno = pthread_mutex_lock(&knet_h->tx_mutex);
 	if (savederrno) {
 		log_err(knet_h, KNET_SUB_TX, "Unable to get TX mutex lock: %s",
 			strerror(savederrno));
 		err = -1;
 		goto out;
 	}
 
 	if (knet_h->onwire_ver_remap) {
 		memmove(get_data_v1(knet_h, knet_h->recv_from_sock_buf), buff, buff_len);
 	} else {
 		switch (onwire_ver) {
 			case 1:
 				memmove(get_data_v1(knet_h, knet_h->recv_from_sock_buf), buff, buff_len);
 				break;
 			default:
 				log_warn(knet_h, KNET_SUB_TX, "preparing sync data onwire version %u not supported", onwire_ver);
 				goto out_tx;
 				break;
 		}
 	}
 
 	err = _parse_recv_from_sock(knet_h, buff_len, channel, onwire_ver, 1);
 	savederrno = errno;
 
 out_tx:
 	pthread_mutex_unlock(&knet_h->tx_mutex);
 out:
 	pthread_rwlock_unlock(&knet_h->global_rwlock);
 
 	errno = err ? savederrno : 0;
 	return err;
 }
 
 ssize_t knet_send(knet_handle_t knet_h, const char *buff, const size_t buff_len, const int8_t channel)
 {
 	int savederrno = 0;
 	ssize_t err = 0;
 	struct iovec iov_out[1];
 
 	if (!_is_valid_handle(knet_h)) {
 		return -1;
 	}
 
 	if (buff == NULL) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	if (buff_len <= 0) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	if (buff_len > KNET_MAX_PACKET_SIZE) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	if (channel < 0) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	if (channel >= KNET_DATAFD_MAX) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	savederrno = pthread_rwlock_rdlock(&knet_h->global_rwlock);
 	if (savederrno) {
 		log_err(knet_h, KNET_SUB_HANDLE, "Unable to get read lock: %s",
 			strerror(savederrno));
 		errno = savederrno;
 		return -1;
 	}
 
 	if (!knet_h->sockfd[channel].in_use) {
 		savederrno = EINVAL;
 		err = -1;
 		goto out_unlock;
 	}
 
 	memset(iov_out, 0, sizeof(iov_out));
 
 	iov_out[0].iov_base = (void *)buff;
 	iov_out[0].iov_len = buff_len;
 
 	err = writev(knet_h->sockfd[channel].sockfd[0], iov_out, 1);
 	savederrno = errno;
 
 out_unlock:
 	pthread_rwlock_unlock(&knet_h->global_rwlock);
 	errno = err ? savederrno : 0;
 	return err;
 }