diff --git a/provisioner/terraform/testdata/generate.sh b/provisioner/terraform/testdata/generate.sh
index 6cc79568582ee..64aab66895146 100755
--- a/provisioner/terraform/testdata/generate.sh
+++ b/provisioner/terraform/testdata/generate.sh
@@ -3,37 +3,73 @@
 set -euo pipefail
 cd "$(dirname "${BASH_SOURCE[0]}")"
 
-for d in */; do
-	pushd "$d"
+generate() {
+	local name="$1"
+
+	echo "=== BEGIN: $name"
+	terraform init -upgrade &&
+		terraform plan -out terraform.tfplan &&
+		terraform show -json ./terraform.tfplan | jq >"$name".tfplan.json &&
+		terraform graph -type=plan >"$name".tfplan.dot &&
+		rm terraform.tfplan &&
+		terraform apply -auto-approve &&
+		terraform show -json ./terraform.tfstate | jq >"$name".tfstate.json &&
+		rm terraform.tfstate &&
+		terraform graph -type=plan >"$name".tfstate.dot
+	ret=$?
+	echo "=== END: $name"
+	if [[ $ret -ne 0 ]]; then
+		return $ret
+	fi
+}
+
+run() {
+	d="$1"
+	cd "$d"
 	name=$(basename "$(pwd)")
 
 	# This needs care to update correctly.
 	if [[ $name == "kubernetes-metadata" ]]; then
-		popd
-		continue
+		echo "== Skipping: $name"
+		return 0
 	fi
 
 	# This directory is used for a different purpose (quick workaround).
 	if [[ $name == "cleanup-stale-plugins" ]]; then
-		popd
-		continue
+		echo "== Skipping: $name"
+		return 0
 	fi
 
 	if [[ $name == "timings-aggregation" ]]; then
-		popd
-		continue
+		echo "== Skipping: $name"
+		return 0
+	fi
+
+	echo "== Generating test data for: $name"
+	if ! out="$(generate "$name" 2>&1)"; then
+		echo "$out"
+		echo "== Error generating test data for: $name"
+		return 1
 	fi
+	echo "== Done generating test data for: $name"
+	exit 0
+}
 
-	terraform init -upgrade
-	terraform plan -out terraform.tfplan
-	terraform show -json ./terraform.tfplan | jq >"$name".tfplan.json
-	terraform graph -type=plan >"$name".tfplan.dot
-	rm terraform.tfplan
-	terraform apply -auto-approve
-	terraform show -json ./terraform.tfstate | jq >"$name".tfstate.json
-	rm terraform.tfstate
-	terraform graph -type=plan >"$name".tfstate.dot
-	popd
+declare -a jobs=()
+for d in */; do
+	run "$d" &
+	jobs+=($!)
+done
+
+err=0
+for job in "${jobs[@]}"; do
+	if ! wait "$job"; then
+		err=$((err + 1))
+	fi
 done
+if [[ $err -ne 0 ]]; then
+	echo "ERROR: Failed to generate test data for $err modules"
+	exit 1
+fi
 
 terraform version -json | jq -r '.terraform_version' >version.txt