diff --git a/spa/include/spa/defs.h b/spa/include/spa/defs.h
index c725ffdf9..62ccfe8f6 100644
--- a/spa/include/spa/defs.h
+++ b/spa/include/spa/defs.h
@@ -72,6 +72,7 @@ enum spa_result {
 	SPA_RESULT_INCOMPATIBLE_PROPS = -36,
 	SPA_RESULT_INCOMPATIBLE_VERSION = -37,
 	SPA_RESULT_NOT_FOUND = -38,
+	SPA_RESULT_BUSY = -39,
 };
 
 #define SPA_ASYNC_BIT			(1 << 30)
diff --git a/spa/plugins/alsa/alsa-sink.c b/spa/plugins/alsa/alsa-sink.c
index 44858bced..7a4f9e30c 100644
--- a/spa/plugins/alsa/alsa-sink.c
+++ b/spa/plugins/alsa/alsa-sink.c
@@ -245,6 +245,7 @@ impl_node_port_set_format(struct spa_node *node,
 			  const struct spa_format *format)
 {
 	struct state *this;
+	int err;
 
 	spa_return_val_if_fail(node != NULL, SPA_RESULT_INVALID_ARGUMENTS);
 
@@ -270,8 +271,8 @@ impl_node_port_set_format(struct spa_node *node,
 		if (spa_format_audio_raw_parse(format, &info.info.raw, &this->type.format_audio) < 0)
 			return SPA_RESULT_INVALID_MEDIA_TYPE;
 
-		if (spa_alsa_set_format(this, &info, flags) < 0)
-			return SPA_RESULT_ERROR;
+		if ((err = spa_alsa_set_format(this, &info, flags)) < 0)
+			return err;
 
 		this->current_format = info;
 		this->have_format = true;
diff --git a/spa/plugins/alsa/alsa-source.c b/spa/plugins/alsa/alsa-source.c
index 027688cfd..8f86e440c 100644
--- a/spa/plugins/alsa/alsa-source.c
+++ b/spa/plugins/alsa/alsa-source.c
@@ -273,6 +273,7 @@ impl_node_port_set_format(struct spa_node *node,
 			  uint32_t port_id, uint32_t flags, const struct spa_format *format)
 {
 	struct state *this;
+	int err;
 
 	spa_return_val_if_fail(node != NULL, SPA_RESULT_INVALID_ARGUMENTS);
 
@@ -297,8 +298,8 @@ impl_node_port_set_format(struct spa_node *node,
 		if (spa_format_audio_raw_parse(format, &info.info.raw, &this->type.format_audio) < 0)
 			return SPA_RESULT_INVALID_MEDIA_TYPE;
 
-		if (spa_alsa_set_format(this, &info, flags) < 0)
-			return SPA_RESULT_ERROR;
+		if ((err = spa_alsa_set_format(this, &info, flags)) < 0)
+			return err;
 
 		this->current_format = info;
 		this->have_format = true;
@@ -384,7 +385,7 @@ impl_node_port_enum_params(struct spa_node *node,
 			t->param_alloc_buffers.Buffers,
 			":", t->param_alloc_buffers.size,    "i", this->props.min_latency * this->frame_size,
 			":", t->param_alloc_buffers.stride,  "i", 0,
-			":", t->param_alloc_buffers.buffers, "i", 2,
+			":", t->param_alloc_buffers.buffers, "ir", 2,
 									2, 1, 32,
 			":", t->param_alloc_buffers.align,   "i", 16);
 		break;
diff --git a/spa/plugins/alsa/alsa-utils.c b/spa/plugins/alsa/alsa-utils.c
index aa827dc83..f04472d78 100644
--- a/spa/plugins/alsa/alsa-utils.c
+++ b/spa/plugins/alsa/alsa-utils.c
@@ -14,7 +14,16 @@
 
 #include "alsa-utils.h"
 
-#define CHECK(s,msg) if ((err = (s)) < 0) { spa_log_error(state->log, msg ": %s", snd_strerror(err)); return err; }
+static int convert_errnum(struct state *state, int errnum)
+{
+	switch (errnum) {
+	case -EBUSY:
+		return SPA_RESULT_BUSY;
+	}
+	return SPA_RESULT_ERROR;
+}
+
+#define CHECK(s,msg) if ((err = (s)) < 0) { spa_log_error(state->log, msg ": %s", snd_strerror(err)); return convert_errnum(state, err); }
 
 static int spa_alsa_open(struct state *state)
 {
@@ -128,7 +137,7 @@ spa_alsa_enum_format(struct state *state, struct spa_format **format, const stru
 
 	opened = state->opened;
 	if ((err = spa_alsa_open(state)) < 0)
-		return SPA_RESULT_ERROR;
+		return err;
 
 	hndl = state->hndl;
 	snd_pcm_hw_params_alloca(&params);
diff --git a/src/pipewire/mem.c b/src/pipewire/mem.c
index 10d42d337..0851435b0 100644
--- a/src/pipewire/mem.c
+++ b/src/pipewire/mem.c
@@ -74,7 +74,7 @@ static inline int memfd_create(const char *name, unsigned int flags)
 #endif
 
 
-#undef USE_MEMFD
+#define USE_MEMFD
 
 /** Map a memblock
  * \param mem a memblock
diff --git a/src/pipewire/port.c b/src/pipewire/port.c
index 97771d614..c3bf27310 100644
--- a/src/pipewire/port.c
+++ b/src/pipewire/port.c
@@ -372,7 +372,7 @@ int pw_port_set_format(struct pw_port *port, uint32_t flags, const struct spa_fo
 	pw_log_debug("port %p: set format %d", port, res);
 
 	if (!SPA_RESULT_IS_ASYNC(res)) {
-		if (format == NULL) {
+		if (format == NULL || res < 0) {
 			if (port->allocated) {
 				free(port->buffers);
 				pw_memblock_free(&port->buffer_mem);
diff --git a/src/pipewire/remote.c b/src/pipewire/remote.c
index 7d1688575..f582e2367 100644
--- a/src/pipewire/remote.c
+++ b/src/pipewire/remote.c
@@ -1124,11 +1124,12 @@ static void node_proxy_destroy(void *_data)
 	struct pw_proxy *proxy = (struct pw_proxy*) data->node_proxy;
 	int i;
 
-	for (i = 0; i < data->trans->area->max_input_ports; i++)
-		clear_port(&data->in_ports[i]);
-	for (i = 0; i < data->trans->area->max_output_ports; i++)
-		clear_port(&data->out_ports[i]);
-
+	if (data->trans) {
+		for (i = 0; i < data->trans->area->max_input_ports; i++)
+			clear_port(&data->in_ports[i]);
+		for (i = 0; i < data->trans->area->max_output_ports; i++)
+			clear_port(&data->out_ports[i]);
+	}
 	clean_transport(proxy);
 
 	spa_hook_remove(&data->node_listener);