scripts/tls13.test: retries (up to 10) for early data scenarios, to mitigate race noted in #4918 .

scripts/tls13.test

@@ -13,6 +13,9 @@ if [ "${AM_BWRAPPED-}" != "yes" ]; then
     unset AM_BWRAPPED
 fi
 
+# retries to mitigate race on early data:
+early_data_try_max=10
+
 # getting unique port is modeled after resume.test script
 # need a unique port since may run the same time as testsuite
 # use server port zero hack to get one
@@ -244,6 +247,10 @@ if [ $? -eq 0 ]; then
 fi
 
 if [ "$early_data" = "yes" ]; then
+
+    early_data_try_num=1
+    while :; do
+
 	echo -e "\n\nTLS v1.3 Early Data - session ticket"
 	port=0
 	(./examples/server/server -v 4 -r -0 -R "$ready_file" -p $port 2>&1 | \
@@ -268,16 +275,29 @@ if [ "$early_data" = "yes" ]; then
 	fi
 	if [ $RESULT -ne 0 ]; then
             echo -e "\n\nIssue with TLS v1.3 Early Data - session ticket"
+	    if [ $early_data_try_num -lt $early_data_try_max ]; then
+		echo -e "retry #${early_data_try_num}...\n"
+		: $((++early_data_try_num))
+		continue
+	    fi
             do_cleanup
             exit 1
 	fi
 	do_cleanup
+	break
+
+    done
+
     echo ""
 fi
 
 if [ "$early_data" = "yes" -a "$psk" = "yes" ]; then
     echo -e "\n\nTLS v1.3 Early Data - PSK"
     port=0
+
+    early_data_try_num=1
+    while :; do
+
 	(./examples/server/server -v 4 -s -0 -R "$ready_file" -p $port 2>&1 | \
              tee "$server_out_file") &
 	server_pid=$!
@@ -306,9 +326,19 @@ if [ "$early_data" = "yes" -a "$psk" = "yes" ]; then
 	fi
 	if [ $RESULT -ne 0 ]; then
             echo -e "\n\nIssue with TLS v1.3 Early Data - PSK"
+	    if [ $early_data_try_num -lt $early_data_try_max ]; then
+		echo -e "retry #${early_data_try_num}...\n"
+		: $((++early_data_try_num))
+		continue
+	    fi
             do_cleanup
             exit 1
 	fi
+
+	break
+
+    done
+
 else
     echo "Early Data not available"
 fi