Abort 'vcl_init' asap if a VMOD object instance cannot be created. See https://varnish-cache.org/lists/pipermail/varnish-dev/2024-September/009853.html

Author: carlosabalde

src/core.h

@@ -413,6 +413,9 @@ extern vmod_state_t vmod_state;
 #define REDIS_FAIL_WS(ctx, result) \
     REDIS_FAIL(ctx, result, "Workspace overflow")
 
+#define REDIS_FAIL_INSTANCE(ctx, result) \
+    REDIS_FAIL(ctx, result, "Failed to create instance")
+
 #ifdef TLS_ENABLED
 #define REDIS_TLS(ctx, rcontext, db, message1, message2, ...) \
     do { \

src/vmod_redis.c

@@ -592,6 +592,10 @@ vmod_db__init(
             "New database instance registered (db=%s)",
             instance->name);
     }
+
+    if (*db == NULL) {
+        REDIS_FAIL_WS(ctx,);
+    }
 }
 
 VCL_VOID