diff --git a/spa/plugins/alsa/alsa-sink.c b/spa/plugins/alsa/alsa-sink.c
index b7bf4cd1e..036ba38d9 100644
--- a/spa/plugins/alsa/alsa-sink.c
+++ b/spa/plugins/alsa/alsa-sink.c
@@ -587,6 +587,8 @@ impl_node_port_set_io(void *object,
 
 	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
 
+	spa_log_debug(this->log, NAME " %p: io %d %p %zd", this, id, data, size);
+
 	switch (id) {
 	case SPA_IO_Buffers:
 		this->io = data;
diff --git a/spa/plugins/audioconvert/audioconvert.c b/spa/plugins/audioconvert/audioconvert.c
index 7db2cad33..aef5353e0 100644
--- a/spa/plugins/audioconvert/audioconvert.c
+++ b/spa/plugins/audioconvert/audioconvert.c
@@ -310,8 +310,8 @@ static int negotiate_link_buffers(struct impl *this, struct link *link)
 		SPA_PARAM_BUFFERS_align,   SPA_POD_Int(&align)) < 0)
 		return -EINVAL;
 
-	spa_log_debug(this->log, "%p: buffers %d, blocks %d, size %d, align %d",
-			this, buffers, blocks, size, align);
+	spa_log_debug(this->log, "%p: buffers %d, blocks %d, size %d, align %d %d:%d",
+			this, buffers, blocks, size, align, out_alloc, in_alloc);
 
 	datas = alloca(sizeof(struct spa_data) * blocks);
 	memset(datas, 0, sizeof(struct spa_data) * blocks);
@@ -329,7 +329,7 @@ static int negotiate_link_buffers(struct impl *this, struct link *link)
 		free(link->buffers);
 	link->buffers = spa_buffer_alloc_array(buffers, flags, 0, NULL, blocks, datas, aligns);
 	if (link->buffers == NULL)
-		return -ENOMEM;
+		return -errno;
 
 	link->n_buffers = buffers;
 
@@ -896,8 +896,8 @@ static int impl_node_process(void *object)
 		ready = 0;
 		for (i = 0; i < this->n_nodes; i++) {
 			r = spa_node_process(this->nodes[i]);
-			spa_log_trace_fp(this->log, NAME " %p: process %d %d", this, i, r);
-
+			spa_log_trace_fp(this->log, NAME " %p: process %d %d: %s",
+					this, i, r, r < 0 ? spa_strerror(r) : "ok");
 			if (r < 0)
 				return r;
 
diff --git a/spa/plugins/audioconvert/fmtconvert.c b/spa/plugins/audioconvert/fmtconvert.c
index 0fcd0fe10..c22524f57 100644
--- a/spa/plugins/audioconvert/fmtconvert.c
+++ b/spa/plugins/audioconvert/fmtconvert.c
@@ -809,8 +809,11 @@ static int impl_node_process(void *object)
 	inport = GET_IN_PORT(this, 0);
 
 	outio = outport->io;
-	spa_return_val_if_fail(outio != NULL, -EIO);
 	inio = inport->io;
+
+	spa_log_trace_fp(this->log, NAME " %p: io %p %p", this, inio, outio);
+
+	spa_return_val_if_fail(outio != NULL, -EIO);
 	spa_return_val_if_fail(inio != NULL, -EIO);
 
 	spa_log_trace_fp(this->log, NAME " %p: status %p %d %d -> %p %d %d", this,
diff --git a/spa/plugins/audioconvert/merger.c b/spa/plugins/audioconvert/merger.c
index 3d32ca084..d467f13e1 100644
--- a/spa/plugins/audioconvert/merger.c
+++ b/spa/plugins/audioconvert/merger.c
@@ -820,6 +820,9 @@ impl_node_port_set_io(void *object,
 
 	spa_return_val_if_fail(this != NULL, -EINVAL);
 
+	spa_log_debug(this->log, NAME " %p: set io %d on port %d:%d",
+			this, id, direction, port_id);
+
 	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
 
 	port = GET_PORT(this, direction, port_id);
@@ -853,8 +856,12 @@ static inline int get_in_buffer(struct impl *this, struct port *port, struct buf
 {
 	struct spa_io_buffers *io;
 
-	if ((io = port->io) == NULL ||
-	    io->status != SPA_STATUS_HAVE_BUFFER ||
+	if ((io = port->io) == NULL) {
+		spa_log_trace_fp(this->log, NAME " %p: no io on port %d",
+				this, port->id);
+		return -EIO;
+	}
+	if (io->status != SPA_STATUS_HAVE_BUFFER ||
 	    io->buffer_id >= port->n_buffers) {
 		spa_log_trace_fp(this->log, NAME " %p: empty port %d %p %d %d %d",
 				this, port->id, io, io->status, io->buffer_id,
@@ -926,7 +933,8 @@ static int impl_node_process(void *object)
 	spa_return_val_if_fail(outio != NULL, -EIO);
 	spa_return_val_if_fail(this->conv.process != NULL, -EIO);
 
-	spa_log_trace_fp(this->log, NAME " %p: status %d %d", this, outio->status, outio->buffer_id);
+	spa_log_trace_fp(this->log, NAME " %p: status %p %d %d", this,
+			outio, outio->status, outio->buffer_id);
 
 	if ((res = get_out_buffer(this, outport, &dbuf)) != 0)
 		return res;
diff --git a/src/modules/module-client-node/client-node.c b/src/modules/module-client-node/client-node.c
index df3a1fc2a..55f16e9f9 100644
--- a/src/modules/module-client-node/client-node.c
+++ b/src/modules/module-client-node/client-node.c
@@ -1565,7 +1565,7 @@ static void node_port_added(void *data, struct pw_port *port)
 	struct impl *impl = data;
 	struct port *p = pw_port_get_user_data(port);
 
-	pw_port_set_mix(port, (struct spa_node *)&p->mix_node,
+	pw_port_set_mix(port, &p->mix_node,
 			PW_PORT_MIX_FLAG_MULTI |
 			PW_PORT_MIX_FLAG_MIX_ONLY);
 
diff --git a/src/pipewire/node.c b/src/pipewire/node.c
index 10150097e..a3ff885e9 100644
--- a/src/pipewire/node.c
+++ b/src/pipewire/node.c
@@ -179,7 +179,8 @@ static int start_node(struct pw_node *this)
 				    &SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Start));
 
 	if (res < 0)
-		pw_log_debug("node %p: start node error %s", this, spa_strerror(res));
+		pw_log_error("node %p: start node error %d: %s",
+				this, res, spa_strerror(res));
 
 	return res;
 }
diff --git a/src/pipewire/port.c b/src/pipewire/port.c
index 20ac04aef..ed8f04c85 100644
--- a/src/pipewire/port.c
+++ b/src/pipewire/port.c
@@ -200,8 +200,8 @@ int pw_port_init_mix(struct pw_port *port, struct pw_port_mix *mix)
 		}
 	}
 
-	pw_log_debug("port %p: init mix %d.%d io %p", port,
-			port->port_id, mix->port.port_id, mix->io);
+	pw_log_debug("port %p: init mix %d.%d io %p: (%s)", port,
+			port->port_id, mix->port.port_id, mix->io, spa_strerror(res));
 
 	return res;
 }
@@ -1061,9 +1061,12 @@ int pw_port_use_buffers(struct pw_port *port, uint32_t mix_id,
 	}
 	if (port->state == PW_PORT_STATE_READY) {
 		if (!SPA_FLAG_CHECK(port->mix_flags, PW_PORT_MIX_FLAG_MIX_ONLY)) {
+			pw_log_debug("port %p: use buffers on node: %p", port,
+					node->node);
 			res = spa_node_port_use_buffers(node->node,
 					port->direction, port->port_id, buffers, n_buffers);
-			pw_log_debug("port %p: use buffers on node: %d (%s)",
+			if (res < 0)
+				pw_log_error("port %p: use buffers on node: %d (%s)",
 					port, res, spa_strerror(res));
 		}
 		port->allocated = false;