neon-image: Add debugging tools to image

Dockerfile

@@ -103,12 +103,17 @@ RUN set -e \
     && echo 'Acquire::Retries "5";' > /etc/apt/apt.conf.d/80-retries \
     && apt update \
     && apt install -y \
+        bpftrace \
+        ca-certificates \
         libreadline-dev \
         libseccomp-dev \
-        ca-certificates \
-	# System postgres for use with client libraries (e.g. in storage controller)
-        postgresql-15 \
+        iproute2 \
+        lsof \
         openssl \
+        # System postgres for use with client libraries (e.g. in storage controller)
+        postgresql-15 \
+        screen \
+        tcpdump \
     && rm -f /etc/apt/apt.conf.d/80-retries \
     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
     && useradd -d /data neon \

pgxn/neon/libpagestore.c

@@ -1152,8 +1152,7 @@ pageserver_try_receive(shardno_t shard_no)
 
 	while (true)
 	{
-		rc = PQgetCopyData(shard->conn, &resp_buff.data, 1 /* async */);
-		if (rc == 0)
+		if (PQisBusy(shard->conn))
 		{
 			WaitEvent	event;
 			if (WaitEventSetWait(shard->wes_read, 0, &event, 1,
@@ -1162,6 +1161,10 @@ pageserver_try_receive(shardno_t shard_no)
 			{
 				return NULL;
 			}
+		}
+		rc = PQgetCopyData(shard->conn, &resp_buff.data, 1 /* async */);
+		if (rc == 0)
+		{
 			if (!PQconsumeInput(shard->conn))
 			{
 				return NULL;